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Renewable Energy Credits : ウィキペディア英語版
Renewable Energy Certificate (United States)

Renewable Energy Certificates (RECs), also known as Green tags, Renewable Energy Credits, Renewable Electricity Certificates, or Tradable Renewable Certificates (TRCs), are tradable, non-tangible energy commodities in the United States that represent proof that 1 megawatt-hour (MWh) of electricity was generated from an eligible renewable energy resource (renewable electricity). Solar renewable energy certificates (SRECs) are RECs that are specifically generated by solar energy.
These certificates can be sold and traded or bartered, and the owner of the REC can claim to have purchased renewable energy. According to the U.S. Department of Energy's Green Power Network, RECs represent the environmental attributes of the power produced from renewable energy projects and are sold separately from commodity electricity. While traditional carbon emissions trading programs use penalties and incentives to achieve established emissions targets, RECs simply incentivize carbon-neutral renewable energy by providing a production subsidy to electricity generated from renewable sources. It is important to understand that the energy associated with a REC is sold separately and is used by another party. The consumer of a REC receives only a certificate.
In states that have a REC program, a green energy provider (such as a wind farm) is credited with one REC for every 1,000 kWh or 1 MWh of electricity it produces (for reference, an average residential customer consumes about 800 kWh in a month). A certifying agency gives each REC a unique identification number to make sure it doesn't get double-counted. The green energy is then fed into the electrical grid (by mandate), and the accompanying REC can then be sold on the open market. "Retirement occurs when a Renewable Energy Certificate (REC) is used by the owner of the REC. Use of the REC may include, but is not limited to, (1) use of the REC by an end-use customer, marketer, generator, or utility to comply with a statutory or regulatory requirement, (2) a public claim associated with a purchase of RECs by an end-use customer, or (3) the sale of any component attributes of a REC for any purpose. Once a REC is retired, it may not be sold, donated, or transferred to any other party. No party other than the owner may make claims associated with retired RECs."〔http://www.green-e.org/learn_dictionary.shtml〕
The purchasing of a REC is equal to purchasing a claim to the environmental attributes of renewable electricity generation without purchasing or consuming the clean electricity itself. The clean electricity may have been inserted on a grid that is not connected to the grid to which the final user of the REC is connected.〔(【引用サイトリンク】url=http://apps3.eere.energy.gov/greenpower/markets/certificates.shtml?page=0 )〕 Therefore it cannot be said that the user is in any sense consuming the renewable energy itself. REC purchase does not affect how much renewable energy was actually generated - only who gets credit for using certain renewable energy that is being generated.
==Background==
There are two main markets for renewable energy certificates in the United States - compliance markets and voluntary markets.
Compliance markets are created by a policy that exists in 29 U.S. states, plus the District of Columbia and Puerto Rico, called Renewable Portfolio Standard. In these states, the electric companies are required to supply a certain percent of their electricity from renewable generators by a specified year. For example, in California the law is 33% renewable by 2020, whereas New York has a 24% requirement by 2013.〔For a full listing of state renewable portfolio standards, see: http://www.dsireusa.org〕 Electric utilities in these states demonstrate compliance with their requirements by purchasing RECs; in the California example, the electric companies would need to hold RECs equivalent to 33% of their electricity sales.
Voluntary markets are ones in which customers choose to buy renewable power out of a desire to use renewable energy. Most corporate and household purchases of renewable energy are voluntary purchases. Renewable energy generators located in states that do not have a Renewable Portfolio Standard can sell their RECs to voluntary buyers, usually at a cheaper price than compliance market RECs.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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