Arthur H. Rosenfeld with Deborah Poskanzer
A Graph Is Worth a Thousand
Gigawatt-Hours
How California Came to Lead the United
States in Energy Efficiency
Innovations Case Narrative:
The California Effect
Humans burn fossil fuels to provide energy for our needs, including heat, luz,
transportation, refrigeration, and industrial processes. Our continued dependence
on combustion produces carbon dioxide, contributing to the increasing concen-
trations of greenhouse gases (GHGs) in the earth’s atmosphere. Although energy
efficiency alone will not likely be enough to reverse this trend, currently it is by far
the fastest, cleanest, and cheapest energy resource available.
This article will discuss how my colleagues and I have promoted energy effi-
ciency over the last 40 años. Our efforts have involved thousands of people from
many different areas of expertise. The work has proceeded in several areas:
• Investigating the science and engineering of energy end-use
• Assessing the potential and theoretical opportunities for energy efficiency
• Developing analytic and economic models to quantify opportunities
• Researching and developing new equipment and processes to bring these
opportunities to fruition
Arthur H. Rosenfeld is a member of the California Energy Commission, where he pre-
sides over the Research, Development and Demonstration Committee, the Dynamic
Pricing Committee, and the Energy Efficiency Committee. Rosenfeld was the founder
of the Center for Building Science at Lawrence Berkeley National Laboratory (LBNL),
which he led until 1994. Rosenfeld is a recipient of the Szilard Award for Physics in the
Public Interest, the Carnot Award for Energy Efficiency from the U.S. Department of
Energía, and the Enrico Fermi Award, the oldest and one of the most prestigious science
and technology awards given by the U.S. Government. Dr. Rosenfeld is also the co-
founder of the American Council for an Energy Efficient Economy (ACEEE), el
University of California’s Institute for Energy Efficiency (CIEE), and the Washington-
based Center for Energy and Climate Solutions (CECS).
© 2009 Arthur H. Rosenfeld and Deborah Poskanzer
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Arthur H. Rosenfeld with Deborah Poskanzer
• Participating in the development of California and later federal standards for
energy performance in buildings and appliances
• Ensuring that market incentives were aligned with policies
• Designing clear and convincing graphics to convey opportunities and results to
all stakeholders
Here I tell the story of how we developed and combined these efforts by devel-
oping a conceptual framework, calculating costs and benefits, and deploying our
findings in a way that
would achieve maximum
persuasive impact. During
this time I have served in
various capacities: as a
physics professor at the
Universidad de California, a
researcher at Lawrence
Berkeley National Lab
(LBNL), an advisor at the
federal Department of
Energía, and most recently
a Commissioner on the
California
Energía
Commission.1
Technological innovation has been
and will continue to be an
important component of
efficiency improvement. Sin embargo,
legislative, regulatory, and market
innovations have also been a
critical and challenging part of
our effort. Our work covers a
broad range of interconnected
efforts; the ability to coordinate
and align the work in all these
sectors is at the core of my
definition of “innovative.”
Technological innova-
tion has been and will
continue to be an impor-
tant component of effi-
ciencia
mejora.
Sin embargo, legislative, regu-
latory, and market inno-
vations have also been a
critical and challenging
part of our effort. Our work covers a broad range of interconnected efforts; el
ability to coordinate and align the work in all these sectors is at the core of my def-
inition of “innovative.”
This article is built around a collection of favorite graphs that my colleagues
and I have used over the years to support the campaign for efficiency. I begin with
two graphs that illustrate general concepts of energy efficiency and energy intensi-
ty in order to illustrate the amazing savings available from improvements in ener-
gy use. Próximo, a series of figures chronicle how we used and continue to use techni-
cal and economic data to substantiate our arguments for an effective energy effi-
ciency policy. I have chosen several examples of innovation that have contributed
substantially to efficiency improvements over the long term: refrigerators, elec-
tronic lighting ballasts, computer applications that simulate building energy per-
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A Graph Is Worth a Thousand Gigawatt-Hours
rendimiento, and valuation methods for conserved energy. These cases are not neces-
sarily the most recent—some are based on research performed many decades
ago—but each one illustrates the complex web of challenges in engineering, eco-
nomics, and policy that is typical of the efficiency field, and each one continues to
bear fruit.
The cases discussed in this article all originated in my home state of California
before they went on to influence energy efficiency strategy at the national or glob-
al level. California has been, and remains, the main arena for my efforts, and after
four decades of innovation we are a leader in energy efficiency. The gap between
our lower per-capita electricity use and national consumption has been dubbed
the “California Effect.” How much of this effect can be credited to our efficiency
efforts, as opposed to advantages in climate and industrial mix, is a point of debate.
I give my own analysis here, and the article that follows, by Ralph Cavanagh, también
discusses the issue.
En conclusión, I will describe an exciting new policy development that repre-
sents the culmination of many years of multi-pronged, interdisciplinary ground-
trabajar. In September 2008, the California Public Utilities Commission (CPUC)
released California’s Long-Term Energy Efficiency Strategic Plan, which was fol-
lowed in September 2009 by the announcement of a $3.1 billion budget for the first three-year stage of implementation.2 The Strategic Plan is a crucial compo- nent of the state’s effort to roll back GHG emissions to 1990 levels by the year 2020. Achieving this goal, as set forth in the landmark Global Warming Solutions Act of 2006 (Assembly Bill 32), will bring California into near-compliance with the Kyoto Protocols. More importantly, the plan’s detailed and entirely feasible program of increased energy savings, paired with job creation, provides a much-needed road map for a nationwide “green economy” stimulus. ENERGY EFFICIENCY: CONCEPTS AND DEFINITIONS Energy efficiency is defined as the amount of useful output derived from primary energy input. We encounter the idea of end-use efficiency every day when we cal- culate how many miles per gallon our cars achieve, or how much our electricity use drops when we replace an old refrigerator with a better one. Obviamente, the greater the efficiency of our equipment, the less fuel we need and the lower our impact on climate change. The goal of energy efficiency is to use technical and process improvements to our appliances, buildings, and vehicles to deliver the same, or comparably satisfactory, levels of performance for less primary energy input. To track the macroeconomic significance of efficiency gains we can index the energy intensity of an economy. Energy intensity is defined as the amount of pri- mary energy needed to produce a unit of gross domestic product (PIB): lower energy intensity indicates a more energy-efficient economy. The good news is that in general, energy intensity improves through normal technological progress. This is intuitively obvious when we think about the efficacy of cooking over a wood fire compared to a modern range. Or to be more quantitative, lighting has progressed innovations / caer 2009 59 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 Arthur H. Rosenfeld with Deborah Poskanzer Figure 1. Index of U.S. Energy Use, PIB, Energy Intensity, and CO2, con 1972 = 1. from candles producing one lumen for every six watts of candle wax burned, to incandescent electric bulbs producing 17 lumens with each watt of electric input, to fluorescent lighting that produces 100 lumens per watt. Cifra 1 displays various energy and economic data for the U.S., indexed to a 1972 baseline.3 These data include: Quads (10^15 Btus) of primary energy; Gross Domestic Product (in constant dollars); CO2 emissions; and Energy Intensity (energy divided by GDP). In the high-growth decades following World War II, pri- mary energy use, gross domestic product, and CO2 emissions from combustion increased nearly in lockstep. Between 1949 y 1973, energy intensity barely changed, as seen from the unvarying height of the columns depicting energy inten- sity (E/GDP). In the years preceding the first OPEC oil embargo, the American consumer had not just scarce but diminishing motivation to reduce energy usage. The average retail price of electricity hovered below 2 cents/kWh through the late 1960s and early 1970s; En realidad, the real price (in fixed 2000 dollars) actually declined. comenzando en 1973, sin embargo, the rising price of oil changed the U.S. perspective on energy, spurring California and then other states to adopt energy efficiency standards for buildings and appliances. Después 1973, as Figure 1 muestra, the GDP and energy consumption kept increasing, but the gap between the rates of increase widened dramatically: energy use grew much more slowly than the GDP, and ener- gy intensity improved rapidly. Many factors contributed to these changes, incluir- ing the increasing cost of energy and the implementation of federal Corporate 60 innovaciones / caer 2009 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 A Graph Is Worth a Thousand Gigawatt-Hours Figure 2. Comparison of Three Gorges Dam in China to Refrigerator and AC Efficiency Improvements. Average Fuel Economy (CAFE) standards in the transportation sector. We also note that even as energy intensity was improving, A NOSOTROS. energy use and emissions were increasing though at nowhere near the rate of the 1950s and 1960s. A central concept of energy efficiency is that it can be measured as a source of energy. Every unit of energy we avoid using thanks to a more efficient device has its equivalent in a unit of fossil fuel that need not be prospected and combusted, or on a macro scale, a power plant that need not be built. Fleshing out the bare concept of avoided use with sound methodology and data has been a core part of our work. Cifra 2 shows an especially dramatic example that reaches far beyond California.4 The Three Gorges Dam in China is the largest hydroelectric power sta- tion in the world, completed in 2008 at a cost of $30 billion. The left side of Figure
2 shows the amount of energy the dam can generate, compared to the amount of
electricity that will be avoided once all the refrigerators and air conditioners in
China meet current Chinese appliance performance standards for, respectivamente
2000, 2005, or the U.S. Energy Star label. The right side of the graph compares the
dollar value of generation and saved or avoided electricity. We spotlight China
because the Chinese example points to the amazing opportunities for energy effi-
ciencia. The quantity of energy that will be saved or avoided when refrigerators and
air conditioners meet more stringent performance standards in China will nearly
equal the output from the nation’s largest hydroelectric power station. And the
“value” of the electricity saved will be nearly double that of the power station.
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Arthur H. Rosenfeld with Deborah Poskanzer
Energy efficiency is one weapon in the arsenal against over-dependence on
GHG-emitting fossil fuels. I believe efficiency is the best weapon: cheapest, safest,
and most immediately achievable. The technological barriers to efficiency
improvements are negligible. Efficiency is truly the low-hanging fruit of the alter-
native energy scene. I now turn to the story of how, beginning in the early 1970s,
we worked across many different fields to convince others that significant gains in
efficiency could, En realidad, become a reality.
“INVENTING” ENERGY EFFICIENCY
The price spikes of the 1973 OPEC embargo drew nationwide attention to energy
end-use, but in rapidly-growing California, already sensitized to environmental
issues such as smog and water shortages, the problem caused particular concern. I
can’t claim any great personal prescience: at the time of the crisis, my data set on
energy consumption consisted of exactly two points, both gleaned from my
European colleagues. Primero, European cars got an average of 27 miles per gallon,
compared to our average of 14 mpg. Además, Western Europeans used on
average half as much energy per capita as their American counterparts, but I knew
that they weren’t “freezing in the dark” (the typical phrase used at the time by anti-
conservation naysayers). I had stumbled upon the idea that per-capita energy use
could be reduced without deprivation.
My learning curve spiked in 1974 when I served as a co-leader of a month-long
workshop on energy efficiency, convened by the American Physical Society (APS)
at Princeton University. Our first realization, which soon became a slogan for the
campo, was “what’s cheap as dirt gets treated like dirt.” In the world’s other advanced
economías, a higher dependence on expensive imported fuels made energy costs a
critical factor in long-range economic strategy (on tax policy, balance of trade, y
national security). Consumer psychology was also affected by higher energy prices:
whereas Americans made their purchasing decisions largely on first cost (sticker
price), the Europeans and Japanese were more likely to incorporate life-cycle cost
(sticker price plus future operating costs) into their decisions. The soaring price of
energy had a silver lining as a teachable moment: people could now realize that
adopting better efficiency practices would be equivalent to discovering huge
domestic oil and gas fields, which could be extracted at pennies per gallon of gaso-
line equivalent.
The APS summer study was organized as a mixture of briefings by practition-
ers from commercial sectors where energy consumption was a salient concern
(construction, manufacturing, transportation, utilities, etc.), and analytic sessions
led by physicists and chemists to discuss the state of research. Our overriding con-
cern was to focus on efficiency improvements achievable with current technology,
rather than on theoretically elegant but impractical research. We published our
findings and recommendations in Efficient Use of Energy, for many years the best-
seller of the American Institute of Physics.5
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A Graph Is Worth a Thousand Gigawatt-Hours
The volume set the tone for much of the energy efficiency work to follow, con
its mixture of pure and directed research, its incorporation of social and econom-
ic factors into the engineering analysis, and its emphasis on feasibility. We were also
aware that we had to illustrate our findings with concrete examples that would
convey the importance of efficiency to a non-expert public (and government). Para
ejemplo, one-third of Efficient Use of Energy was devoted to discussion of recent
advances in window technology, such as thin films of low-emissivity (low-E) semi-
conductor material; when applied to the inside surface of double-glazed windows,
they doubled the thermal resistance.
Like much of the volume, this section was highly technical and inaccessible to
the lay reader, and yet it contained highly practical implications that we wanted to
convey to the public. It was written just as the last environmental objections to the
Trans-Alaska Pipeline were overruled in favor of construction. The section’s
authors calculated that low-E windows, installed nationwide, would save the
equivalent of half the oil produced in the Prudhoe Bay oilfields. In combination
with other modest efficiency measures, these windows could have eliminated the
need for the pipeline; it was this simple memorable fact, rather than the painstak-
ing calculations, that became the public angle for the book.
STATE AND SCIENCE IN CALIFORNIA
Returning to California after the APS Efficiency Study, I took what was intended as
a temporary leave from particle physics in order to teach, conduct research, y
proselytize about energy efficiency. It seemed logical to focus on buildings and
appliances rather than the transportation sector, since the latter was already under
the oversight of the Department of Transportation, whereas work on the former
was virtually tabula rasa. After a few years, it was clear that my sabbatical from
physics had turned into a permanent defection. Worse yet, I coaxed a number of
other scientists away from traditional career paths in physics or chemistry in favor
of the risks of an upstart field. Colleagues including Sam Berman, Will Siri, Marca
Levin, and Steve Selkowitz joined me in the process of redirecting our skills from
basic research to the mixture of science, economics, and policy that efficiency work
entailed. My most promising physics graduate students, David Goldstein and
Ashok Gadgil, also joined us.
I do not wish to suggest that California was the only locus of innovation in
energy efficiency. Colleagues in other parts of the country made the same career
shift and did important early work, including Marc Ross at the University of
Michigan and Rob Socolow at Princeton. The critical difference was that we were
graced with optimal conditions for our ventures. Lawrence Berkeley National
Laboratory (LBNL) had recently come under the fresh leadership of Andrew
Sessler, who signaled the lab’s intention to engage with society’s most pressing
problems by creating a new Energy and Environment Division as his first act as
director in 1973. The division was a natural host for my Energy Efficient Buildings
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Arthur H. Rosenfeld with Deborah Poskanzer
Program (later known as the Center for Building Science), and sheltered it from
much of the instability and administrative strife faced by similar programs at other
institutions. Al mismo tiempo, the University of California at Berkeley launched a
doctoral program in Energy and Resources under the visionary leadership of John
Holdren. Because this unique program created a talent pool with the necessary
interdisciplinary skill set in policy, economics, and science, we were able to take on
more ambitious projects than other institutions.
Finalmente, and most importantly, our California community of efficiency scien-
tists formed just as the state’s first efficiency legislation came into effect. A propos-
al to establish state oversight of energy supply and demand had been languishing
on Governor Reagan’s desk since 1973, opposed by utility companies, appliance
manufacturers, and the building industry. Sin embargo, in the atmosphere of crisis fol-
lowing the OPEC embargo, the governor was compelled to act, and the Warren-
Alquist Act was signed into law in 1974. The Act established the California Energy
Commission (CEC), which had the authority to approve or deny site applications
for new power plants, to write energy performance standards for new buildings, a
fund research and development, and to support investment in efficiency programs.
Al poco tiempo después, the commission’s mandate was expanded to include major appli-
ances. The first generation of state appliance performance standards (Título 20) era
published in 1976, followed in 1978 by a building standard (Título 24).6
The establishment of the CEC created a market for our research, which in turn
made the commission effective. This fortunate convergence of policy requirements
and scientific knowledge was a key factor behind California’s leadership in energy
eficiencia. In the years before the commission’s in-house research capability was
desarrollado, it relied upon local scientists for data, forecasts, testing protocols, y
analytic tools. One example was the creation of a computer application to simu-
late the thermal performance of buildings. In early drafts of Title 24 (residential
building standards), the commission proposed limiting window area to 15 por ciento
of wall area, based on the (erroneous) belief that larger window areas would waste
heat in winter or “coolth” in summer. No allowance was made for the compass ori-
entation of the windows; en efecto, I don’t think the sun was even mentioned.
The staff had used a computer simulation that ran on a “fixed-thermostat”
assumption, maintaining indoor temperature at 72º F (22º C) year round. Keeping
to this exact mark required heating or cooling—or both—every day of the year! Nosotros
saw the need for a simulation that allowed a “floating temperature” mode, permit-
ting indoor temperature to rise slightly during the day, as solar heat entered and
was stored in the building’s mass, and then float down at night, as the house coast-
ed on stored heat. Such a model could demonstrate that in many situations,
expanded window area would actually lower energy demand, supporting the
inclusion of passive solar methods in the state building code. Desafortunadamente, el
existing public-domain programs were too awkward and bug-ridden to handle
more complex and realistic thermal simulations. I immediately sat down with my
colleague Ed Dean, a professor of architecture, to write a residential thermal sim-
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A Graph Is Worth a Thousand Gigawatt-Hours
ulator, which we dubbed Two-Zone because it distinguished between the north
and south halves of the house. The CEC was soon convinced to drop the proposed
limit on non-north-facing windows, and the concept of passive solar heating was
included in Title 24, years before the term itself was in common use.7
Two-Zone became the progenitor of a generation of public-domain building
performance simulators. When the federal Department of Energy (DOE) era
formed in 1976, it funded further development of the software through a collabo-
ration of the national labs at Berkeley, Argonne, and Los Alamos. Since that time,
the program, known as DOE-2, has been an
essential tool for evaluating energy use in
complex systems. Although similar propri-
etary programs were also developed, el
public availability of DOE-2 allowed exten-
sive feedback, which fed the increasing
sophistication of the model. While enabling
tools such as DOE-2 do not in themselves
save energy, without them it would not be
possible to write appropriate state and fed-
eral buildings standards, or to establish
high-profile certification programs such the
Green Building Council’s Leadership in
Energy and Environmental Design (LEED).8
Improved HVAC (heating, ventilation,
and air-conditioning) actuación
en
buildings has been one of the most prof-
itable and uncontroversial ways for society
to save energy and money. It would be tedious to calculate exactly how much of
these savings can be attributed to the DOE-2 program, since standards were imple-
mented gradually across the states, and some technical improvements occurred
independently of implementation. My own guesstimate is that annual U.S. savings
in buildings energy use (compared to pre-standards performance) are roughly $10 mil millones por año, and that the modest allocation of public funds to support the cre- ation of a viable public-domain modeling tool advanced the adoption of standards by one to three years.9 Improved HVAC (heating, ventilation ,and air-conditioning) performance in buildings has been one of the most profitable and uncontroversial ways for society to save energy and money. THE POLITICS OF DEMAND FORECASTING Another early task of the California Energy Commission was to determine an appropriate balance between increasing generation capacity through granting per- mits for new plants and extracting more “service” from the existing supply. Often as not, these decisions took place against a politically charged backdrop. Proposition 15, scheduled to go to California voters in March 1976, proposed to halt the construction of all nuclear power plants. My graduate student David innovations / caer 2009 65 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 Arthur H. Rosenfeld with Deborah Poskanzer Figure 3. 1975 Projections of California Power Demand: Business as Usual vs. Goldstein & Rosenfeld Efficiency Scenario. Goldstein and I were determined to cut through the noise surrounding this hot- button issue with the first rigorous study of peak demand forecasts, shown in Figure 3.10 We hoped that if the rising demand for electricity could be slowed through more efficient performance standards then the contentious issue of new power plants might be avoided. The left side of Figure 3 shows the actual supply curve during the high-growth decade leading up to 1974, when peak production capacity reached about 30 gigawatts (GW). The right side of the figure compares two future (post-1974) sce- narios. Under the “business as usual” (BAU) scenario assumed by the utilities, demand would continue to grow at 5 percent per annum, requiring the construc- tion of an average of two large (one-GW) power plants every year, mainly nuclear or fossil fueled. More than half of that new electricity (es decir., more than one plant per year) would be used to supply electricity to new construction. In the days before Title 24, two of the most egregious sources of waste were widespread electric resist- ance heating in residences and 24/7 lighting in commercial buildings. When we calculated the potential savings from eliminating these practices, we came to the remarkable conclusion that the state’s annual growth rate could drop to 1.2 por- centavo. This scenario would eliminate the need not only for the contentious nuclear plants but also for planned fossil fueled plants. When we demonstrated our find- 66 innovaciones / caer 2009 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 A Graph Is Worth a Thousand Gigawatt-Hours ings at a State Assembly hearing in December 1975, the utility companies were so skeptical that Pacific Gas & Electric (PG&mi) called Director Sessler to suggest that I be fired on the grounds that physicists were unqualified to forecast electricity demand. Over the course of the later 1970s and early 1980s, our vision was slowly vin- dicated and the hostility of PG&E was gradually replaced with a productive collab- oration. Después 1975, the actual growth of peak demand dropped to 2.2 percent per annum, much closer to our forecast than to that of the utilities. (For purposes of comparison, we later added this actual growth curve to the original version of Figure 3.) The fall from favor of nuclear power plants due to a combination of public opposition and unexpectedly high costs is well known, but in fact no appli- cation to build any kind of large power plant (nuclear, coal, or gas) was filed in California between 1974 y 1998.11 Demand continued to grow during that time, por supuesto, but new supply came from small independent producers and co-gener- ators, from renewables (hydroelectric, geothermal, and wind resources), and from sources outside the state. Improved efficiency was the largest single source of new electric services during that period. After the deregulation of California’s energy supply system in the late 1990s, and the ensuing electricity “crisis” of 2001, policies were put in place to encourage the procurement of a “reserve margin” large enough to guarantee reliability. In response to state incentives, investments in both power plants and efficiency accel- erated. Fortunately, the benefits of efficiency were not forgotten in the rush to increase capacity. En 2003, the CPUC and the CEC issued the first Energy Action Plan (EAP I)12 to guide energy policy decisions. A major function of EAP I and of subsequent updates has been to prescribe a “loading order” of energy supplies whenever increased demand needs to be satisfied. For immediate demand crises, demand response (p.ej., shutting off unnecessary load) should take precedence over costly purchase of peaking generation from the market. For longer-term supply planning, investments in efficiency should “load” into the supply system before investments in generation; when new generation is necessary, renewable genera- tion should load before fossil generation. De 2001 a 2009, encima 15,000 MW of generation resources, including renewables, have been built in California, yet effi- ciency investments are increasing.13 INITIATING APPLIANCE STANDARDS IN CALIFORNIA Whereas gaining acceptance for state oversight of energy standards in buildings was relatively straightforward, creating a state appliance standard proved more controversial. Since manufacturers usually sold to the national market, federal responsibility seemed more appropriate and effective to most people. Además, the appliance industry was more concentrated and organized than the construc- tion sector, and thus better able to mount opposition to changes. This did not deter David Goldstein and me from satisfying our curiosity about the correlation innovations / caer 2009 67 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 Arthur H. Rosenfeld with Deborah Poskanzer Figure 4. Supporting Appliance Standards: Lifecycle Operating Cost of 1975 Refrigerator Models. between refrigerator price and efficiency. Our interest in the refrigerator was moti- vated by its place as the most energy-thirsty appliance in the family home: in the 1970s it accounted for more than a quarter of the typical residential electricity bill. We tested 22 units from model year 1975, expecting to see some correlation between higher sticker price and higher performance, defined as the cooling serv- ice delivered per energy input. En otras palabras, if we could establish a correlation between sticker price and efficiency, we could support informed consumer choic- es based on payback time (how long it takes to offset a high purchase price with lower energy bills) and life-cycle cost (purchase price plus lifetime operating costs). Cifra 4 displays the results of our refrigerator tests as a “scatter chart,” the only feasible choice of format given that the data were truly scattered!14 Despite our efforts to control for every factor imaginable (volumen, door configuration, opciones, etc.), there was very poor correlation between purchase price and per- rendimiento. Some of the lowest priced models (C, oh) showed the same or even cheaper life-cycle costs than models costing $100 a $200 más (I, j, k). We quick- ly realized that if the less efficient half of the model group were deemed unfit for the market, the consumer would not perceive any change in the market range of prices or options while being “forced” to save on average $350 over the 16-year
service life of a refrigerator. Presumiblemente, as performance standards spurred further
technical improvements, these savings would grow. The macroeconomic conclu-
sion was even more exciting: since statewide energy use by refrigerators alone
already accounted for about five GW, implementing even mild state standards
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A Graph Is Worth a Thousand Gigawatt-Hours
Cifra 5. A NOSOTROS. Refrigerators 1947-2001: Energy Use, Volumen, Savings.
could avoid the need to construct numerous power plants.
En 1976 California Governor Jerry Brown was looking for a way to avoid
approving Sundesert, the only application still pending for a one-GW nuclear
power plant. I took advantage of a chance meeting at the Berkeley Faculty Club to
sketch out Figure 4 for him on a napkin. Thinking our findings too good to be
true, the governor called Energy Commissioner Gene Varanini for corroboration.
I believe his exact words were, “Is this guy Rosenfeld for real?” Commissioner
Varanini vouched for us, Sundesert was cancelled, and California’s Appliance
Efficiency Regulations (Título 20) were implemented later that year.
REFRIGERATORS: AN EFFICIENCY SUCCESS STORY
The dramatic improvement in refrigerator energy efficiency over the last half-cen-
tury is illustrated in Figure 5, which shows electricity use by new U.S. refrigerators
for the model years 1947–2001.15
The heavy line with dark squares represents the annual kWh use of the sales-
weighted average new refrigerator. Note that the energy consumption of new mod-
els has declined steeply in absolute terms, even though this line is not adjusted for
increasing volume. De hecho, the volume of the average model grew from 8 cubic feet
a 20 durante este período, as shown by the line marked with open circles; if the con-
sumption line were adjusted for volume, the efficiency gains would look even more
impressive. The right-hand scale shows the number of large (one-GW) base-load
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Arthur H. Rosenfeld with Deborah Poskanzer
(5,000 hours/year) power plants required to power 150 million average refrigera-
tor-freezer units. The difference between the annual energy consumption of an
promedio 1974 modelo (1,800 kWh) and an average 2001 modelo (450 kWh) es 1350
kWH. The energy savings from this 1,350 kWh/year difference, multiplied by 150
million units, es 200 TWh/year, equivalent to the output of 50 avoided one-GW
plants. The monetary savings of course depends on the price of electricity, cual
varies considerably. To give a rough sense of the magnitude of savings, en 8
cents/kWh, the avoided annual expense to consumers is $16 billion. The other factor contributing to the sudden drop in refrigerator energy use in the mid-1970s was the advent of a new manufacturing technology, blown-in foam insulation. The coincidence of California’s first performance standards with the market entry of better-performing models began a positive reinforcing cycle that continues to this day. Targeted, government-assisted R&D helps make possible the introduction of increasingly efficient new models, which themselves become the basis for tightening the efficiency standards, because they demonstrate that meet- ing a tighter standard is technologically feasible. When California standards were tightened in 1980 y 1987, followed by federal standards in 1990, 1993, y 2001, manufacturers were able and willing to meet the challenge, an example of govern- ment-industry partnership that has served society very well. BRINGING THE UTILITY COMPANIES ON BOARD Turning the utility companies from opponents of energy conservation into stake- holders was a key part of California’s innovation in energy efficiency. As men- tioned earlier, the encouraging results of initial efficiency policies gradually changed a contentious relationship into a collaborative one. High oil prices lasting through the late 1970s until 1985 helped PG&E and other companies perceive that their interests might lie in supporting affordable conservation rather than in pur- suing expensive new energy supplies. Sin embargo, telling utilities to promote efficien- cy was essentially asking them to sell less of their primary product and thus to lose revenue, at least according to a traditional business model. A new business model aligning market incentives with policy objectives was needed. The CEC, the CPUC, and the Natural Resources Defense Council created a new utility business model disconnecting profits from the amount of energy gen- erated. A compensatory revenue stream from public goods charges was awarded to companies that agreed to promote efficiency through consumer education pro- grams or fluorescent lightbulb subsidies. The technique of disconnecting utility company revenue from sales became known as “decoupling.” Working out the details of decoupling was, and remains, a complex process, described more fully in the following article by Ralph Cavanagh, one of its chief architects.16 One serious obstacle to the innovation of decoupling was the inability to easi- ly compare conventional energy supplies with the potential of conservation. The value of the utilities’ efficiency programs could not be established without a stan- 70 innovaciones / caer 2009 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 A Graph Is Worth a Thousand Gigawatt-Hours Figure 6. Supply Curve of Conserved Residential Lighting. dardized way to set equivalencies in cost and scale. Conventional energy supplies tend to be large and concentrated, thus easy to measure, whereas conservation practices tend to be small and diffuse, thus difficult to measure in aggregate. Our task as scientists was to provide data to counter the skeptics who argued that the granular nature of efficiency—a lightbulb here, a new refrigerator there—could not possibly add up to a significant “supply.” Alan Meier and Jan Wright of the Lawrence Berkeley National Labs unraveled this tangled methodological problem in the late 1970s by standardizing “bookkeeping” methods for avoided use, and creating a new investment metric, “the cost of conserved energy.”17 This allowed us to aggregate the energy and cost impacts of scattered conservation steps into a uni- fied supply curve. The basic assumption when calculating the cost of conserved energy (CCE) is that any conservation measure begins with an initial investment, which then cre- ates a stream of energy savings for the lifetime of the measure. De este modo: CCE = [annualized investment cost]/[annual energy savings] The equitable yearly repayment to an investor (p.ej., the utility) should be the annualized cost of energy conserved. In the case of avoided electricity use, the energy savings can be expressed in units of $/kWh, or in other cases in units for gas
($/MBtu), or wind, or geothermal. Since the CCE does not depend on a particular local price or type of displaced energy, the comparisons have the virtue of “porta- bility” across regional price variations and types of supply. innovaciones / caer 2009 71 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 Arthur H. Rosenfeld with Deborah Poskanzer Figure 6, “Supply Curve of Conserved Residential Lighting,”18 demonstrates the application of rigorous efficiency bookkeeping methods to one sector of energy end-use, residential lighting. The costs of eight different steps to improve lighting efficiency are plotted against the electricity that each measure would save (meas- ured in gigawatt hours per year), and then compared to the actual retail price of electricity. Thus the savings derived from, decir, Step 2 (“fluorescent kitchen light- ing”) are shown by the area between Step 2 and the “price” line, eso es, a savings of $0.05/kWh X 600 GWh = $30 millón. The great virtue of this conceptually straightforward approach was that the cost-effectiveness of various methods was clear at a glance. For example Steps 7 y 8 of Figure 6 are clearly not worthwhile. Además, the supply curves of conserved energy provided a simple way to compare proposed new energy technologies with energy-saving actions.19 The challenge of creating reliable supply curves is that deriving sound “macro” esti- mates from the “micro” contributions of individual changes rests on the painstak- ing collection of data on population, household size, and consumer purchasing practices, along with lightbulb cost, actuación, and life span, and much more. Working out the proper energy accounting methods is the core of this work. ELECTRONIC BALLASTS The development of electronic ballasts for fluorescent lamps is the key technical innovation behind the recently burgeoning use of compact fluorescent lights (CFLs), which has resulted in tremendous energy savings. The story of electronic ballasts (also known as “high-frequency” or “solid state” ballasts) is a typical exam- ple of how innovations in engineering, política, and commerce need to be aligned to achieve efficiency improvements. At the APS Efficiency Summer Study in 1974, we considered the feasibility of creating an electronic ballast that would boost current to 1,000 times that delivered by the power line. We knew that such a device would increase the efficiency of flu- orescent lights by 10 por ciento a 15 por ciento, and also eliminate the annoying buzz that was a major obstacle to replacing quiet but wasteful incandescent bulbs in res- idential settings. Además, electronic ballasts would enable miniaturization, dim- ming, remote control, and other user friendly, energy-saving features not possible with magnetic ballasts. Around that time, the major ballast manufacturing firms did in fact consider developing an electronic ballast, but rejected the idea due to the substantial capi- tal investment required and the losses from early retirement of existing infrastruc- tura. As is often the case in overly concentrated sectors—two large firms account- ed for 90 percent of the ballast industry—the market provided more disincentives than incentives for innovation. It was clear to us that the impetus for R&D would have to come from elsewhere. In the wake of the APS study, Sam Berman resigned a tenured post at Stanford University to lead LBNL’s research on solid-state ballasts (as well as the low-E windows discussed earlier). 72 innovaciones / caer 2009 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 A Graph Is Worth a Thousand Gigawatt-Hours Figure 7. The California Effect? California vs. A NOSOTROS. Per Capita Electricity Consumption 1960-2006. Fortunately the newly-formed DOE included a small Office of Conservation and Solar Energy, which was willing to fund both these projects. De 1977 a 1981, the DOE supported the development, evaluación, and introduction of elec- tronic ballasts into the U.S. marketplace. Basic research took place at LBNL and two subcontracting laboratories. Three small, innovative firms new to the ballast field were awarded cost-sharing contracts to carry out development.20 Berman shepherded the prototypes through UL certification and persuaded PG&E to host a critical field test in its San Francisco skyscraper, which demonstrated electricity savings of greater than 30 percent over magnetic ballasts. When the first electronic ballasts came to market in the late 1980s, they were so clearly superior that the major lighting manufacturers felt compelled to adopt and continue to develop the technology. Philips, En particular, reasoned that if large electronic ballasts were effective for traditional tubular fluorescent lamps, they could miniaturize ballasts to produce very efficient CFLs. The appearance of products such as Philips’ 16-W CFLs, radiating as much light as a 70-W incandes- cent light and lasting 10,000 hours instead of 750, was a turning point in the pen- etration of fluorescent lamps into the residential market. The risk and expense of converting lighting plants to manufacture a new gen- eration of ballasts was an important difference from the earlier case of improving refrigerators. Converting to blown-in foam insulation was comparatively simple, and invisible to the end-user, so it required no consumer re-education. It is unlike- ly that the large manufacturers would have taken this step without the assurance of market success afforded by DOE-funded research. In the case of electronic bal- innovaciones / caer 2009 73 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 Arthur H. Rosenfeld with Deborah Poskanzer Figure 8. California’s Annual Energy Savings Attributed to Efficiency Measures. lasts, it was much harder to launch a positive reinforcing cycle of tightening stan- dards and improving technologies. States did promulgate efficiency standards for fluorescent ballasts (California in 1983, New York in 1986, Massachusetts and Connecticut in 1988, and Florida in 1989). By themselves, sin embargo, state standards could not drive market transformation, since they could be satisfied by conven- tional magnetic ballasts (cual, not coincidentally, improved once the electronic ballasts were developed). The experience suggests that in some cases, the seeding effect of publicly funded research is essential for market transformation. IS THERE A “CALIFORNIA EFFECT”? There is little doubt that California’s energy efficiency policies have been success- lleno. How successful, exactly, remains an open question. There is an ongoing debate about how much of California’s lower per capita electricity consumption is due to policy differences, and how much to climate or the comparatively low level of heavy industry. As the need to reduce energy consumption and CO2 emissions becomes more urgent, the so-called “California Effect” is coming under increasing scrutiny. Whether or not to emulate California’s efforts hangs on the question of their efficacy. Cifra 7 shows the difference in per-capita electricity consumption between California and the U.S. for the period 1960 a 2006. En 1960, California’s per-capita consumption was within 5 perecent of the national average. The curves gradually diverged between 1960 and the mid 1970s, but the difference was still only about 15 percent at the time of the OPEC embargo. Por 2006, sin embargo, Californians were using over 40 percent less electricity per capita than the nation- 74 innovaciones / caer 2009 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 A Graph Is Worth a Thousand Gigawatt-Hours Figure 9. California’s Peak Annual Energy Savings Attributed to Efficiency Measures. al average—and only about 10 percent more than they had in 1975. Calculating the proportion of electricity savings directly traceable to our effi- ciency efforts is a complicated task. Our best conservative estimate, shown by the middle line in Figure 7, is that at least 25 percent of the observed difference can be directly attributed to policy—an estimate that does not include any secondary effects due to changes in building practices, and appliance markets. Differences in climate and industrial mix, electricity price, demographic trends, and other factors help explain some of the difference,21 but other trends have been at work as well. In California, Por ejemplo, building standards and electricity prices have discour- aged the use of electric water heating in favor of natural gas, which reduces elec- tricity consumption relative to the national average. Al mismo tiempo, most new housing has been built in the hotter inland valley and desert areas, dramatically increasing energy consumption for air conditioning. También, most appliance standards initiated in California were eventually adopted nationally, so the policy impacts of appliance standards also affect the national per- capita consumption average, an effect that is not captured by the difference in per- capita consumption. De este modo, for a variety of reasons, electricity use in California has been essentially flat and should either continue or even decrease as California extends standards to new devices, accelerates building performance requirements, and expands programs aimed at improving efficiency. Figures 8 y 9 show California’s savings in greater detail, breaking down the part of the consumption gap that can be attributed to efficiency efforts.22 innovations / caer 2009 75 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 Arthur H. Rosenfeld with Deborah Poskanzer Performance standards for buildings and appliances, which as noted have been progressively strengthened every few years, account for roughly half the savings. The other half has resulted from utility company programs that promote adoption of energy efficient technologies, such as commercial lighting retrofit incentives and residential appliance rebates. Through 2003, these measures have resulted in about 40,000 GWh of annual energy savings and have avoided 12,000 megawatts (MW) of demand—the same as 24 500-MW power plants (the MW data is not shown in the graph).23 These savings have reduced CO2 emissions from the electricity gen- eration sector by nearly 20 percent compared to what otherwise might have hap- pened without these programs and standards.24 This equates to an avoidance of CO2 emissions in the state as a whole of about four percent, due to historical ener- gy efficiency programs and standards.25 These savings will only continue to grow. The effect of efficiency policies is even more pronounced at peak load. Peak loads are a serious concern in California, as in other Sunbelt states and many fast- growing economies around the world. Air conditioning loads on hot afternoons can greatly increase system demand—as much 30 percent in California. Reducing the magnitude of these warm-season spikes is one of the most pressing items on the efficiency agenda. Building standards that focus on minimizing heat gain and thermal transfer and appliance standards that set minimum efficiency levels for air conditioning equipment can reduce peak demand. This in turn lowers the cus- tomer’s immediate cooling costs as well as the system-wide costs of maintaining underutilized peaking capacity year round; both measures contribute to lower bills.26 Figure 9 repeats Figure 8’s breakdown of savings derived from standards and utility programs, but for peak demand. El 12,000 MWs of capacity provided by efficiency measures have effectively avoided the need to build additional power plants to meet that demand. FROM “INNOVATION” TO “BUSINESS AS USUAL”: THE LONG-TERM ENERGY EFFICIENCY STRATEGIC PLAN When the campaign for energy efficiency in California began four decades ago, the goal was simply to reduce the expense, pollution, and political turmoil resulting from over-dependence on generating energy from fossil fuels. Sin embargo, as aware- ness of the climate-changing effects of GHGs grew, so too did recognition of effi- ciency as a low-cost, low-impact, reliable source of energy. Now that our environ- mental concerns must share the stage with the current economic crisis, efficiency has suddenly become something of a mantra. Since efficiency investments have some of the fastest payback times in the “green economy,” and since efficiency improvements are based on currently available technology, implementation offers a uniquely practical opportunity to stimulate economic growth and reduce GHG emissions at the same time. A year ago, the California Public Utilities Commission (CPUC) issued California’s Long-Term Energy Efficiency Strategic Plan, mapping out the steps 76 innovaciones / caer 2009 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 A Graph Is Worth a Thousand Gigawatt-Hours toward meeting the state’s GHG reduction goals by 2020.27 The commission esti- mates that the Strategic Plan will create energy savings of close to 7,000 gigawatt hours, 1,500 megawatts, y 150 million metric therms of natural gas. This is roughly equal to the avoided construction of three 500-megawatt power plants. Avoided emission of GHGs is expected to reach three million tons per year by 2012, equivalent to the emissions of nearly 600,000 carros. It is hoped that new effi- ciency programs will create between 15,000 y 18,000 jobs, in areas ranging from construction to education. The plan has four “Big and Bold” goals: • All new residential construction in California will be zero net energy by 2020. • All new commercial construction in California will be zero net energy by 2030. • The Heating, Ventilation, and Air Conditioning (HVAC) industry will be reshaped to ensure optimal equipment performance. • All eligible low-income homes will be energy efficient by 2020. The budget for just the first three years of the Strategic Plan was recently set at $3.1 From my perspective as a veteran of the efficiency campaign, the Strategic
Plan presbillion, making it the largest-ever state commitment to efficiency.
Funding will support a wide variety of programs in pursuit of the overarching
objetivos, including the four examples below:
• CalSPREE, the largest residential retrofit effort in the United States, will cut
energy use by 20 percent for up to 130,000 existing homes by 2012.
• $175 million will go to programs to deliver “zero net energy” homes and com- mercial buildings. • $260 million will go to 64 local agencies (city, county, and regional) that would
otherwise lack the expertise to create more energy-efficient public buildings.
• More than $100 million will go to for education and training programs at all levels of the education system. From my perspective as a veteran of the efficiency campaign, the Strategic Plan presents a fascinating combination of old lessons and new ambitions. Although the overall scope of the plan is far more comprehensive and coordinated than anything yet seen, clearly the content of the programs is based on many years of experience in buildings and appliance standards. Además, the plan was developed in col- laboration with more than 500 stakeholder groups, including the state’s major investor-owned utilities (IOUs): Pacific Gas and Electric Co., San Diego Gas and Electric Co., Southern California Edison, and Southern California Gas Co. The IOUs will be responsible for actually implementing the programs in their respec- tive regions. The budget for the programs comes from the increased public goods charges authorized by the CPUC, on the condition that the funds be invested in efficiency. The slightly increased costs to ratepayers will be quickly offset by their reduced consumption. Por supuesto, this process of coordinating best engineering practices with policy goals and utility market mechanisms has its origins in our forays into collaboration in the early 1980s. The most ambitious and innovative aspect of the Long-Term Energy Efficiency Strategic Plan is its insistence on re-branding the practice of energy efficiency as innovations / caer 2009 77 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 Arthur H. Rosenfeld with Deborah Poskanzer normative behavior rather than crisis response. Commissioners Michael Peevey and Dian Grueneich have frequently spoken of “making efficiency a way of life.” If successful, this would mean a reversal of the prevailing mindset. For many years, my graphs of energy supply/demand forecasts displayed competing scenarios labeled respectively “with efficiency measures” and “business as usual.” Business as usual was understood to mean “without efficiency measures.” If California’s Strategic Plan succeeds, the comprehensive approach to energy efficiency that we have been pursuing for over 30 years will have finally become “business as usual.” 1. California Energy Commission, www.energy.ca.gov/commissioners/rosenfeld.html. A.H Rosenfeld, 1999. The Art of Energy Efficiency: Protecting the Environment with Better Technology, Annual Review of Energy and the Environment, 24, páginas. 33–82. 2. California Public Utilities Commission (CPUC) and California Energy Commission (CEC), Septiembre 2008. California Long-Term Energy Efficiency Strategic Plan: Achieving Maximum Energy Beyond. www.cpuc.ca.gov/PUC/energy/electric/Energy+Efficiency. Budget announced September 24, 2009: sacramento.bizjournals.com/sacramento/stories/2009/09/21/daily61.html. California Savings 2009 and for in 3. Graph by Patrick McAuliffe, based on data from the U.S. Energy Information Administration (EIA), Annual Energy Review, 2007. See also A.H. Rosenfeld, PAG. McAuliffe and J. wilson, 2004, “Energy Efficiency and Climate Change,” Encyclopedia of Energy, volumen. 2, páginas. 373-382. Elsevier Press. 4. D. Fridley, Lawrence Berkeley National Lab. Savings calculated ten years after standards take effect. 5. American Institute of Physics, 1975. Efficient Use of Energy: The APS Studies on the Technical Aspects of the More Efficient Use of Energy. In Proceedings of AIP Conference No. 25. 6. Warren-Alquist Act: www.energy.ca.gov/reports/Warren-Alquist_Act/index.html. Appliance stan- codes: www.energy.ca.gov/appliances/index.html. Building dards: www.energy.ca.gov/title24/index.html. 7. Rosenfeld, 1999, páginas. 40-41. 8. “Energy Research at DOE: Was It Worth It?” Energy Efficiency and Fossil Energy Research 1978 a 2000, Appendix E, “Case Studies for the Energy Efficiency Program,” páginas 100-104. Washington, corriente continua: National Academies Press, 2001. 9. Rosenfeld 1999, 40-41. 10. D.B.Goldstein and A.H. Rosenfeld, 1976. Projecting an Energy Efficient California, LBL 3274//EEB 76-1, Lawrence Berkeley National Lab. See also Rosenfeld, 1999, páginas. 41-42. 11. Rosenfeld, 1999, pag. 42. 12. www.energy.ca.gov/energy_action_plan/index.html 13. http://docs.cpuc.ca.gov/PUBLISHED/FINAL_DECISION/106008.htm 14. D.B.Goldstein and A.H. Rosenfeld, 1977. “Facts and Fact Sheets on Home Appliances.” In Energy Extension Services, Proceedings of 1976 Berkeley Workshop. Lawrence Berkeley National Laboratory. 15. H.S. Geller and D.B. Goldstein, 1999. “Equipment Efficiency Standards: Mitigating Global Climate Change at a Profit,” Physics and Society 28(2). 16. For the evolution of “decoupling,” formally known as the Electric Rate Adjustment Mechanism (ERAM), ver, inter alia, B. Barkovich, 1989, Regulatory Interventionism in the Utility Industry, Quorum; y r. Hirsh, 1999, Power Loss: The Origins of Deregulation and Restructuring in the American Electric Utility System, Cambridge, MAMÁ: CON prensa. 17. A. Meier, j. Wright and A.H. Rosenfeld, 1983. Supplying Energy Through Greater Efficiency: The Potential for Conservation in California’s Residential Sector, berkeley, California: University of California Press. 18. Meier et al. 1983. 19. Most of the conservation supply curves of the late 1970s and early 1980s demonstrated huge 78 innovaciones / caer 2009 Descargado de http://direct.mit.edu/itgg/article-pdf/4/4/57/705404/itgg.2009.4.4.57.pdf by guest on 08 Septiembre 2023 A Graph Is Worth a Thousand Gigawatt-Hours reserves of conserved energy at CCEs of <$0.05/kWh, but the curves turned up sharply at high-
er CCEs, giving the false impression that conservation was a limited resource. In fact this inflec-
tion was not a consequence of diminished conservation, but simply reflected the failure of any-
one to investigate and market cost-effective energy-saving measures above $0.06/kWh. 20. Energy Research at DOE: Was It Worth It? Appendix E, pp. 104-107. DOE’s call for bids in 1977 received no responses from the major ballast manufacturers. Of the small firms that did receive a contract, one eventually developed into a significant, independent ballast manufacturer. At first, one of the large manufacturers of traditional ballasts actively sought to prevent the intro- duction of the electronic ballast by acquiring the technology from this firm and then prevent- ing its dissemination. In 1990, after 6 years of litigation and a $26 million damage award, con-
trol over the technology was partially reacquired by the originating small business.
21. For a discussion of some of these factors, see Anant Sudarshan and James Sweeney,
“Deconstructing the ‘Rosenfeld Curve.’” Working paper, Stanford University, June 1, 2008.
22. Because California’s population has been growing, the 25% of per capita effect in Figure 7 cor-
responds to the 15% effect on total consumption per year in Figure 8.
23. California Energy Commission, “Implementing California’s Loading Order for Electricity
Resources,” Staff Report, CEC-400-2005-043, July 2005, p. E-4.
24. This calculation is based on a marginal CO2 emissions rate of nearly 0.5 tons per MWh for a nat-
ural gas fired power plant with a marginal heat rate of just over 9,000 btu/kWh.
25. Calculated from the product of 22% of the state’s CO2 emissions from electricity consumption
and the reduction of 20% in electricity use due to standards and programs.
26. California Energy Commission, Implementing California’s Loading Order, p. E-4.
27. CPUC and CEC, California Long-Term Energy Efficiency Strategic Plan, September 2008;
www.cpuc.ca.gov/PUC/energy/electric/Energy+Efficiency.
http://docs.cpuc.ca.gov/published/News_release/91027.htm;
www.californiaenergyefficiency.com/index.shtml;
www.reuters.com/article/topNews/idUSTRE58N70520090924.
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