giovedì 24 maggio 2007
How renewable energy certificate works
An alternative energy supplier such as solar plant or wind farm generates several dozens megawatt hours of electricity. Unlike power from fossil fuels, this type of energy produces little to no carbon.
The output is sold to a power company where is mixed with electricity from other sources. To keep track of it a renewable energy certificate (REC) is issued for each MWh of renewable energy a utility purchases.
Consumers can then pay for those RECs, in addition to their regular electricity bill, as a way of investing in renwable energy, which is generally more expensive to produce than electricity derived from gas or coal.
When the consumer flips the switch the electricity is delivered by a local utility. In buying RECs, however they have helped offset carbon emissions by resupplying the grid with green power.