Texas will add more grid batteries than any other state in 2024
canarymedia.com
canarymedia.com
There is a good chance solar per Kwh may reach 1-2 US cents LCOE by 2030. Off course this does not include storage, transmission. But this is an order of magnitude difference from many energy sources only a decade back.
Power generation is generally in GW, and if you're trying to work out how much demand you can satisfy, then that's what you want to know. If you're trying to work out how long you can satisfy it for then you want GWh.