If other regions pursued similar rule-changes, it would leave an estimated 12 million distributed generation units, with a total capacity of about 200 GW, installed by customers across the country sitting on the sidelines for purposes of demand response, according to the U.S. Department of Energy.
In 2007, an estimated 12 million generators had been installed across in the United States, with a total capacity of more than 200 gigawatts, according to a Brookings Institute report on distributed power systems.