A few years back Australia spent $500M on battery storage - it gave them some 10 minute window to switch other sources of power (Gas/Coal stations).
The only storage of any value TODAY is pumped storage. Off-peak pump water up a hill and release it when needed. Problem for us is that the high mountains needed do not exist in the UK (small scale in Scotland but limited supply for short periods).
Norway has made a success of buying Danish wind power on the cheap when there is over supply and pumps water uphill. In periods of High demand they sell the power back to Denmark (& the UK)
At this exact moment in time we have good supplies of wind power, nuclear, gas supply, hydro, coal (ticking over) - we are importing French power.
Our problem is that demand today is 35GW (mild & wet Autumn), we need 55GW in a cold winter day when there could be little or no wind.
Press ahead with Air Heat Pumps etc demand figure will rocket should gas be phased out for home heating and increased demand for car charging.
We do not have really any plans other than more wind power - 11,000 windmills today , 20,000 wind mills in 2030 - no wind the supply is always ZERO
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