Negawatts
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A negawatt market is a proposed idea of implementation of the demand response ( balancing the electrical grid through the changes in consumption) that uses an
energy market Energy markets are national and international regulated markets that deal specifically with the trade and supply of energy. Energy market may refer to an electricity market, but can also refer to other sources of energy. Typically energy developme ...
where the commodity traded is a ''negawatt-hour'', a unit of energy saved as a direct result of energy conservation measures. Negawatt power is investment to reduce electricity consumption rather than investing to increase supply capacity. In this way investing in negawatts can be considered as an alternative to a new power station and the costs and environmental concerns can be compared. Negawatt investment alternatives to reduce consumption by improving efficiency include: * Improved thermal insulation and airtightness for buildings – low environmental impact * Replacing older industrial plant – low environmental impact. Can have a positive impact due to reduced emissions. Negawatt investment alternatives to reduce peak electrical load by time shifting demand include: *
Storage heater A storage heater or heat bank (Australia) is an electrical heater which thermal energy storage, stores thermal energy during the evening, or at night when electricity is available at lower cost, and releases the heat during the day as required. ...
s – older systems had asbestos. Newer systems have low environmental impact. * Demand response control systems where the electricity board can control certain customer loads – minimal environmental impact *
Thermal storage Thermal energy storage (TES) is achieved with widely different technologies. Depending on the specific technology, it allows excess thermal energy to be stored and used hours, days, months later, at scales ranging from the individual process, ...
systems such as ice storage systems to make ice during the night and store it to use it for air conditioning during the day – minimal environmental impact *
Pumped storage hydroelectricity Pumped-storage hydroelectricity (PSH), or pumped hydroelectric energy storage (PHES), is a type of hydroelectric energy storage used by electric power systems for load balancing. The method stores energy in the form of gravitational potential ...
– can have a significant environmental impact – see
Hydroelectricity Hydroelectricity, or hydroelectric power, is electricity generated from hydropower (water power). Hydropower supplies one sixth of the world's electricity, almost 4500 TWh in 2020, which is more than all other renewable sources combined an ...
* other Grid energy storage technologies – impact varies Note that time shifting does not reduce total energy consumed or system efficiency; however, it can be used to avoid the need to build a new power station to cope with a peak load.


Origin and development

A ''negawatt-hour'' is a unit of energy saved as a direct result of energy conservation measures, such as reducing the use of heat or electricity. The concept was developed after
Amory Lovins Amory Bloch Lovins (born November 13, 1947) is an American writer, physicist, and former chairman/chief scientist of the Rocky Mountain Institute. He has written on energy policy and related areas for four decades, and served on the US Nationa ...
authored an article published in the March 21, 1985 issue of Public Utilities Fortnightly arguing that utility companies will sell less electricity and more efficiency by marketing 'negawatts'. In Lovins' opinion, utility customers don’t want
kilowatt-hours A kilowatt-hour ( unit symbol: kW⋅h or kW h; commonly written as kWh) is a unit of energy: one kilowatt of power for one hour. In terms of SI derived units with special names, it equals 3.6 megajoules (MJ). Kilowatt-hours are a common bi ...
of electricity; they want energy services such as hot showers, cold beer, lit rooms, and spinning shafts, which can come more cheaply if electricity is used more efficiently. Lovins credited the term to a typo in a document by the Colorado Public Utilities Commission in which the word "
megawatt The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3. It is used to quantify the rate of energy transfer. The watt is named after James ...
" was misspelled. Negawatts are a form of encouragement to motivate consumers to conserve energy. Lovins considers the concept of conservation "a change in behavior based on the attitude 'Do Less to Use Less.'" He makes a distinction between conservation and efficiency by defining efficiency as "the application of technologies and best practices to eliminate waste based on the attitude, 'Do the same or more with less.'"Knickerbocker. (2001). Cost for negawatt power can be calculated using
cost-effectiveness analysis Cost-effectiveness analysis (CEA) is a form of economic analysis that compares the relative costs and outcomes (effects) of different courses of action. Cost-effectiveness analysis is distinct from cost–benefit analysis, which assigns a monetar ...
or CEA. For
energy efficiency Energy efficiency may refer to: * Energy efficiency (physics), the ratio between the useful output and input of an energy conversion process ** Electrical efficiency, useful power output per electrical power consumed ** Mechanical efficiency, a ra ...
investments a CEA calculation produces the value of saved energy or ''negawatts'' in $/kWh. Such a valuation allows comparing the price of negawatts with price of energy such as electricity from the grid or the cheapest renewable alternative. Specifically, Tuominen et al. have suggested using the dynamic generation cost type of CEA for energy efficiency investments as it includes the best accounting for the time value among the various CEA methods available. Lovins sees negawatt markets as a win-win solution to many environmental problems. Because it is "now generally cheaper to save fuel than to burn it, global warming, acid rain, and urban smog can be reduced not at a cost but at a profit"., Lovins explains that many companies are already enjoying the financial and other rewards that come from saving electricity. Yet progress in converting to electricity saving technologies has been slowed by the indifference or outright opposition of some utilities. A second obstacle to efficiency is that many electricity-using devices are purchased by people who won’t be paying their running costs and thus have little incentive to consider efficiency. Lovins also believes that many customers "don't know what the best efficiency buys are, where to get them, or how to shop for them". In 2003 in France under the guide of Thierry Salomon 23 scientists wrote "Le manifeste Négawatt." Megawatt and negawatt seem to be reminiscent to the larger concept of ecological footprint, and by following this line of thought toward compatibility and comparability a second frame of concept seems appropriate: the impact in another frame or setting where units or numbers can not be compared (see paradigm shift). See association négaWatt.


Market

Lovins has advocated a "negawatt revolution", arguing that utility customers don’t want
kilowatt-hours A kilowatt-hour ( unit symbol: kW⋅h or kW h; commonly written as kWh) is a unit of energy: one kilowatt of power for one hour. In terms of SI derived units with special names, it equals 3.6 megajoules (MJ). Kilowatt-hours are a common bi ...
of electricity; they want energy services such as hot showers, cold beer, lit rooms, and spinning shafts, which can come more cheaply if electricity is used more efficiently. Lovins defines the negawatt market as a way to reduce the gap between the cost of making and saving electricity. The negawatt market can be thought of as a secondary market where electricity is allocated from areas of less use to areas of greater use. This would be a secondary market, due to the fact that it would reallocate electricity from one consumer to another within the already existing
energy market Energy markets are national and international regulated markets that deal specifically with the trade and supply of energy. Energy market may refer to an electricity market, but can also refer to other sources of energy. Typically energy developme ...
. Some feel that to establish a viable market, legislation and cooperation between primary producers, distributors, traders and consumers, may be required. This proposal would encourage the market to have legislative regulations, while still allowing the market to work within itself to set prices and allocate resources. A negawatt market would allow "demand side resources" to participate in
wholesale Wholesaling or distributing is the sale of goods or merchandise to retailers; to industrial, commercial, institutional or other professional business users; or to other wholesalers (wholesale businesses) and related subordinated services. In ...
energy markets. These markets are commonly referred to as a demand response. Demand response can be defined as "enrolling large users of energy in programs to lower their usage in return for compensation, which helps take pressure off the grid" This market would help take pressure off the grid because electricity could "be treated as a commodity just like copper or sowbellies," and therefore traded to areas that need it more than others. As any commodity, negawatts would have to be "tradable across time and space" to be an effective market. Being able to trade negawatts across time and space would allow for an international trading system. To create a market for negawatts, energy companies will need to put more focus toward energy efficiency. This shift in focus would require a new "business structure that will thrive in the 'negawatt market'", which has not yet been developed. Market possibilities are being implemented internationally, implying that one day an official negawatt market will become a reality.


Implementation


Government implementation

Negawatt power is being implemented in many states in the U.S. and is emerging as an international strategy to reduce energy consumption. "Test negawatt auctions began in 1999 in
Connecticut Connecticut () is the southernmost state in the New England region of the Northeastern United States. It is bordered by Rhode Island to the east, Massachusetts to the north, New York to the west, and Long Island Sound to the south. Its capita ...
and
Georgia Georgia most commonly refers to: * Georgia (country), a country in the Caucasus region of Eurasia * Georgia (U.S. state), a state in the Southeast United States Georgia may also refer to: Places Historical states and entities * Related to the ...
and more than a dozen utility exchanges were in existence" in 2000. In an effort to move toward energy efficiency, New York has created programs "supported through Energy $mart, which is run by the New York State Energy Research and Development Authority (NYSERDA), with money from a small surcharge on utility bills." Negawatt power is implemented in California as well as Texas. "Some Texas congressmen and energy companies are trying to help California avert blackouts and utility price shocks this summer with ..'negawatts'. On January 1, 2009, the states of
South Australia South Australia (commonly abbreviated as SA) is a state in the southern central part of Australia. It covers some of the most arid parts of the country. With a total land area of , it is the fourth-largest of Australia's states and territories ...
and
Victoria (Australia) Victoria is a state in southeastern Australia. It is the second-smallest state with a land area of , the second most populated state (after New South Wales) with a population of over 6.5 million, and the most densely populated state in ...
became the first in Australia to offer "householders energy efficiency incentives programs delivered via local electricity retailers." The British
transmission system operator File:Electricity grid simple- North America.svg, 380px, Simplified diagram of AC electricity grid from generation stations to consumers rect 2 243 235 438 Power station rect 276 317 412 556 Transformer rect 412 121 781 400 Electric power transmis ...
incentivizes off-peak use.


Private implementation

The negawatt market is being used by governments and companies. Aluminum manufacturers in the
Pacific Northwest The Pacific Northwest (sometimes Cascadia, or simply abbreviated as PNW) is a geographic region in western North America bounded by its coastal waters of the Pacific Ocean to the west and, loosely, by the Rocky Mountains to the east. Tho ...
shut down their power plants and sold the unused energy because selling the negawatts was more profitable for the company than selling the aluminum product. This was possible because "The smelters hold power contracts with the federal Bonneville Power Administration that contain clauses allowing them to market the electricity." The Associated Electric company in rural Missouri is implementing the usage and spreading the knowledge of negawatts by performing energy audits at their customer's homes to show them where they could be saving electricity. Rebates are being given to help customers pay for more energy-efficient,
Energy Star Energy Star (trademarked ''ENERGY STAR'') is a program run by the U.S. Environmental Protection Agency (EPA) and U.S. Department of Energy (DOE) that promotes energy efficiency. The program provides information on the energy consumption of pr ...
appliances. Keith Hartner, the CEO of Associated Electric Cooperative Inc., feels that negawatts are generating savings for their customers and for the company as well: “The goal of this program is to save money not only at the generator but also at the meter for the members.” Individual households can practice negawatts through using energy-efficient lighting and
Energy Star Energy Star (trademarked ''ENERGY STAR'') is a program run by the U.S. Environmental Protection Agency (EPA) and U.S. Department of Energy (DOE) that promotes energy efficiency. The program provides information on the energy consumption of pr ...
appliances as well as simply reducing
standby power Standby power, also called vampire power, vampire draw, phantom load, ghost load or leaking electricity ("phantom load" and " leaking electricity" are defined technical terms with other meanings, adopted for this different purpose), refers to ...
. The resulting savings sometimes offset the investment in new high efficient light bulbs and appliances. These efficiencies can offset a portion of the cost of a residential photovoltaic system. Negawatts reduces the overall size of the photovoltaic system required for the household, because they are consuming less electricity. This results in a faster payback period for the photovoltaic system. The
City of San Diego San Diego ( , ; ) is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States ...
has created a negawatts initiative called "Reduce then Produce" to promote this idea.


Advantages


Cost

The most noteworthy advantage in creating a negawatt market is the cost incentive. As many will say, "The cheapest watt is the one that's never created."Bartram, Rodgers, & Muise, (2010). P. 8-14. In this market, the consumers who increase their home efficiency, or decrease their energy consumption, can earn money by selling the saved electricity. This is similar to an
emissions trading Emissions trading is a market-based approach to controlling pollution by providing economic incentives for reducing the emissions of pollutants. The concept is also known as cap and trade (CAT) or emissions trading scheme (ETS). Carbon emission ...
or a cap-and-trade system, in which the energy that is not used can be bought from the consumers who saved the energy and sold to those who need to purchase the extra energy. Providers of electricity can encourage consumers to sell back their unused energy, or negawatthours, especially during peak hours. A major question that electric companies need to ask themselves is whether it is less expensive to pay consumers to reduce consumption for a few instances a year or to build and maintain a side-supply resource that would only be used a few times a year. Many argue that the "cost of foregone consumption is less than the cost of increasing the supply of electricity." If a consumer conserves a substantial amount of energy then there can even be an allowance for a
tax deduction Tax deduction is a reduction of income that is able to be taxed and is commonly a result of expenses, particularly those incurred to produce additional income. Tax deductions are a form of tax incentives, along with exemptions and tax credits. T ...
. According to the Negawatt Power Solutions Group, a "building that achieved a 50% energy cost reduction may be eligible for tax deduction up to $1.80 per square foot." Negawatts can help alleviate some of the costs of constructing new, efficient buildings. "The negawatt revolution now provides a way to cut construction costs, capture big returns on capital in renovations, nddramatically cut operating expenses." Existing buildings can be made more efficient by renovating the insulation to cut back on electricity used for heating, installing more efficient light fixtures, and an upgraded HVAC design. Renovating a building to be more energy efficient will cost less than creating entirely new, more efficient buildings.


Reduction of national energy dependency

The reduction of the amount of energy that a region emits can slowly separate a nation from a high energy consumption of oil. The desire to become a less energy-dependent country may promote behavioral changes and a different societal outlook on energy usage. These potential societal perspective changes could lead to an overall more sustainable country. The reduced consumption of energy would also produce less greenhouse gases, which could have positive outcomes on the economy, political parties, and interest groups, such as
environmentalists An environmentalist is a person who is concerned with and/or advocates for the protection of the environment. An environmentalist can be considered a supporter of the goals of the environmental movement, "a political and ethical movement that se ...
. According to Lovins, improvements in energy efficiency and conservation, due to a change in behavioral attitudes, have a huge potential to reduce a country's "long-term energy needs," such as the United States.


Local deregulation

Some conservatives claim that the negawatt market could help nations or states have a deregulated electricity system. This would allow a nation or a state to experiment with "electricity deregulation," in which "demand reductions could be purchased with a minimum of disruption to businesses, workers and the economy." In the United States, for instance, the negawatt market could assist California with
rolling blackout A rolling blackout, also referred to as rota or rotational load shedding, rota disconnection, feeder rotation, or a rotating outage, is an intentionally engineered electrical power shutdown in which electricity delivery is stopped for non-overla ...
s by making more power available from consumers who choose to conserve energy or increase their negawatts. California could achieve the goal of deregulation by allowing a deficit area to "purchase an emergency supply from anywhere within with West" in which "the ultimate purpose of deregulation was to allow competition in the
electricity market In a broad sense, an electricity market is a system that facilitates the exchange of electricity-related goods and services. During more than a century of evolution of the electric power industry, the economics of the electricity markets had un ...
and consumer choice of electricity providers." Negawatt power would allow the consumers in a country's economy to decide how the energy will be distributed: essentially benefiting regions that hope to have a deregulated electricity system.


Drawbacks


Difficulty in creating a negawatt market

Currently, there is no way to precisely measure the amount of energy saved in negawatts; it can only be theoretically determined based on the consumer’s history of energy use. Visualizing has a very important role in “enabling residents to understand and manage their energy use,” which serves as a form of encouragement for consumers to conserve energy. Without the visualization of the energy use, it is difficult to conceptualize negawatts because the consumer cannot see a precise value of the amount of saved energy. Smart meters are becoming a more developed technology to measure energy usage, but "consumers are calling on state regulators to move cautiously on smart meters, citing complaints in some states that the meters are raising electric bills rather than lowering them." Some municipally owned utilities and cooperatives argue that negawatt power "lets consumers treat electricity as a property right rather than a service ..giving themlegal entitlement to power hat theydon't consume.”Jim, (2001). This would indicate that consumers would treat electricity as a property, not a service. Some people, including the senior vice president Joe Nipper from the
American Public Power Association The American Public Power Association (APPA) is the service organization for approximately 2,000 U.S community-owned electric utilities that serve more than 49 million Americans. APPA was created in September 1940 to represent the common intere ...
, oppose the idea that people would receive money for power that they did not even spend. Electricity price caps may also need to be implemented in order for the emerging negawatts market to function correctly.Jim, (2001). To some, government limitations on markets are unfavorable. There is a current view that negawatts are worth pursuing, but that they are unlikely to satisfy the world's thirst for energy to the extent their advocates assume.


Expense of efficiency

Saving energy by the negawatt and creating a negawatt market can present several drawbacks for manufacturers and electricity providers. Manufacturers are less inclined to make energy-efficient devices which meet a specific standard, such as
Energy star Energy Star (trademarked ''ENERGY STAR'') is a program run by the U.S. Environmental Protection Agency (EPA) and U.S. Department of Energy (DOE) that promotes energy efficiency. The program provides information on the energy consumption of pr ...
's standard, because of increased time and cost, while receiving minimal profit. Overall, electricity providers may not want customers to use less energy due to the loss of profit. Some even argue that producing energy-efficient products, such as light bulbs, actually simulate more demand, “resulting in more energy being purchased for conversion into light." Customers may also be less inclined to buy products that are more energy efficient due to the increase in cost and time spent. "Even when the information is known and, despite the overall long-term cost-saving potential, the price of energy is too low...for individuals to justify the initial cost of energy efficiency measures."(2010).
Generating "negawatts"
"
Not only are energy efficient devices more expensive, but "consumers are poorly informed about the savings on offer. Even when they can do the sums, the transaction costs are high: it is a time-consuming chore for someone to identify the best energy-saving equipment, buy it and get it installed."Economist, (2008). P. 78. The technology used to measure the amount of energy that a consumer uses and saves, known as smart meters, grid systems, or energy dashboards, require time for the consumer to understand. Some argue that people need to have access to “simple yet effective information systems to help users understand their energy without having to become technology experts.” The current visual energy measuring devices could be made simpler and less expensive, which may encourage customers to save more energy, thus increasing their negawatts.


See also

* Energy and the environment *
Energy hierarchy The Energy Hierarchy is a classification of energy options, prioritised to assist progress towards a more sustainable energy system. It is a similar approach to the waste hierarchy for minimising resource depletion, and adopts a parallel sequenc ...
*
Energy park An energy park is a separate area used and planned for the purpose of clean energy development, like wind and solar generation facilities. Energy parks create many other economic development benefits too. In Ohio, energy parks are creating thousa ...
*
Energy Star Energy Star (trademarked ''ENERGY STAR'') is a program run by the U.S. Environmental Protection Agency (EPA) and U.S. Department of Energy (DOE) that promotes energy efficiency. The program provides information on the energy consumption of pr ...
*
Environmental issues with energy The environmental impact of the energy industry is significant, as energy and natural resource consumption are closely related. Producing, transporting, or consuming energy all have an environmental impact. Energy has been harnessed by human bei ...
*
Hydrogen economy The hydrogen economy is using hydrogen to decarbonize economic sectors which are hard to electrify, essentially, the "hard-to-abate" sectors such as cement, steel, long-haul transport etc. In order to phase out fossil fuels and limit climate ch ...
*
International Renewable Energy Agency The International Renewable Energy Agency (IRENA) is an intergovernmental organization mandated to facilitate cooperation, advance knowledge, and promote the adoption and sustainable use of renewable energy. It is the first international organis ...
* Leadership in Energy and Environmental Design (LEED) *
List of energy storage projects This is a list of energy storage power plants worldwide, other than pumped hydro storage. Many individual energy storage plants augment electrical grids by capturing excess electrical energy during periods of low demand and storing it in o ...
* Renewable Energy *
Renewable Energy and Energy Efficiency Partnership The Renewable Energy and Energy Efficiency Partnership (REEEP) is a Vienna-baseinternational organisation (link in German)that advances markets for renewable energy and energy efficiency with a particular emphasis on the emerging markets and d ...
* Smart grid * Sustainable Energy for All initiative


References


Works cited

*Airlie, C. (2010, December 7). Uk plans payment for 'negawatt' to curb power use. Retrieved from https://www.bloomberg.com/news/2010-12-07/u-k-plans-payment-for-negawatt-to-curb-power-use-update1-.html *Bartram, L., Rodgers, J., & Muise, K. (2010). ''Chasing the Negawatt: Visualization for Sustainable Living.'' IEEE Computer Graphics & Applications, 30(3), 8-14. Retrieved from Military & Government Collection database. *Fickett, A, Gellings, C, & Lovins, A. (1990, September). Efficient use of electricity. ''Scientific American'' Retrieved December 2010, from http://www.nature.com/scientificamerican/journal/v263/n3/pdf/scientificamerican0990-64.pdf. *Fotopoulos, T. (2007). Is degrowth compatible with a market economy?. ''The International Journal of Inclusive Democracy'', 3(1), Retrieved from https://web.archive.org/web/20110524125322/http://www.inclusivedemocracy.org/journal/vol3/vol3_no1_Takis_degrowth_PRINTABLE.htm *Gulyas, C. (2008, May 8). Negawatts are creating a market for energy saving. Retrieved from http://cleantechnica.com/2008/05/08/negawatts-are-creating-a-market-for-energy-savings/ *H.R. ''6--109th Congress: Energy Policy Act of 2005.'' (2005). In GovTrack.us (database of federal legislation). Retrieved November 2010, 2010, from http://www.govtrack.us/congress/bill.xpd?bill=h109-6 *Knickerbocker, B. (2001, May 29). ''Saving energy by the 'negawatt. Christian Science Monitor, p. 2. Retrieved from
Academic Search Complete Academic Search is a monthly indexing service. It was first published in 1997 by EBSCO Publishing in Ipswich, Massachusetts. Its academic focus is international universities, covering social science, education, psychology, and other subjects. Pub ...
database. *Kolbert, Elizabeth. (2007). "Mr. Green: Environmentalism's most optimistic guru." The New Yorker 1-22. *Landers, Jim. (2001). ''Legislators push for bill to allow sale of "negawatts' to California.'' Dallas Morning News, The (TX), Retrieved from Newspaper Source Plus database. *Lovins, Amory. (1989). The negawatt revolution-solving the co2 problem. Retrieved from http://www.ccnr.org/amory.html *Lovins, A, & Browning, W. (1992, July). Negawatts for buildings. Urban Land, Retrieved from http://sustainca.org/files/BGPrUSACO-RMI_3_.pdf *McCarty, J. (2008, April). Negawatts. Rural Missouri, Retrieved from http://www.ruralmissouri.org/08pages/08AprilWatts9.html * *Peters, Joey. "Consumers Wary of Smart Meters." (2010).http://www.stateline.org/live/details/story?contentId=500546 *{{cite journal , last1 = Rochlin , first1 = C , year = 2009 , title = The alchemy of demand response: turning demand into supply , journal = The Electricity Journal , volume = 22 , issue = 9, pages = 10–25, doi=10.1016/j.tej.2009.09.004 *Weinberg, CJ. (2001). Keeping the lights on-sustainable scenarios for the future. Renewable Energy World, Retrieved from https://web.archive.org/web/20080720164514/http://www.cleanenergystates.org/CaseStudies/Weinberg.pdf *Alliance for clean energy, New York. (2008).http://www.aceny.org/clean-technologies/energy-efficiency.cfm Energy Efficieny *"Energy Conservation: Not Such a Bright Idea." The Economist 10 Aug. 2010. Web. 9 Dec. 2010. *Energy Matters, . (2008, December 31). Energy efficiency focus for australis in 2009. Retrieved from http://www.energymatters.com.au/index.php?main_page=news_article&article_id=265 *"Generating 'negawatts'". (2010, May). Retrieved from http://sri.dexia-am.com/LibrarySRI/ResearchPaper_Utilities_EnergyEfficiency_2010_UK.pdf *NegaWatt Power Solutions Group (2009). ''Incentives''. Retrieved from https://web.archive.org/web/20110711110118/http://gonegawatts.com/incentives.php *Presentation on European Green Paper on Energy Efficiency p. 12 *The negawatts project: changing the paradigm of family energy consumption. (2010, August 6). Retrieved from https://web.archive.org/web/20110930033655/http://www.mitportugal.org/research-highlights/the-negawatts-project-changing-the-paradigm-of-family-energy-consumption.html *(2008). The elusive negawatt. Economist, 387(8579), 78. Retrieved from MasterFILE Premier database. *(2008, March). http://www.loe.org/shows/segments.htm?programID=08-P13-00013&segmentID=4. "From Megawatts to Negawatts" *http://www.lao.ca.gov/ballot/2005/050129.htm


External links

*http://www.negawatt.org/english-presentation-p149.html (English translation of French official website) Energy conservation Energy economics Units of power