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In page Renewable Energy Certificate (United States):

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Critics have attacked renewable energy certificates/credits for allowing renewables producers to double-count the clean energy contribution of the energy they represent. By separating clean energy "attributes" from the energy itself, then selling them in the form of certificates to fossil fuel producers, they allow two entities to take clean-energy credit for the same electricity. Corresponding electricity from the fossil fuel producer is recorded as sourceless "null" energy, effectively scrubbing greenhouse gases emitted during its production from the record.[citation needed]