Much of the power generation equipment now being installed is either for renewable energy (predominately wind and solar) or gas-fired combined cycles that leverage the historic low prices of natural gas.However many of those gas-fired plants were built with an additional purpose:to serve as a fast-reacting source of electricity that can replace renew-able generation when the wind stops blowing or the sun doesn't shine. A better technology choice for "chasing" wind and solar is bulk electricity storage.