From pv magazine USA
US renewables developer NextEra's description of “near-firm” solar 2022 Investor Conference report “assumes a four-hour battery to achieve roughly equivalent reliability during peak hours for comparison with dispatchable generation sources.”
The technical definition of a near-firm solar power plant is one that is coupled to a battery sized at 25% its nameplate capacity, which is capable of providing four hours of energy storage – that is, 100 MWac solar plus 25 MW/100 MWh of energy storage.
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