Overbuilding solar at up to 4 times peak load yields a least-cost all-renewables grid. The global energy firm Wartsila found a least-cost renewables mix for the U.S. that involves overbuilding renewable capacity, but requires no seasonal storage, and needs only four to ten days of multi-day storage capacity. The analysis modelled meeting current uses of electricity, based on projected technology costs for 2030. Solar capacity reaching up to 4.3 times peak load in sunny regions, and wind capacity of up to 2.1 times peak load in windy regions, would form the basis of a least-cost all-renewables resource mix in regions across the United States.
PV Magazine 14th May 2020 read more »