Renewable Portfolio Standards (RPSs) legislation requires that U.S. electricity generation by non-hydro renewables more than double by 2025. These goals are not certain to be met, however, because many RPSs apply cost caps that alter requirements if costs exceed targets.
In 2008 Illinois enacted a RPS, which at current electricity prices, will require significant decreases in renewables costs in order to complete implementation, even given the continuation of federal renewables subsidies.
