Everything you mention is not a problem. Grid operators change prices to match supply and demand. Electricity markets are 24/7 and prices range from negative to

Everything you mention is not a problem. Grid operators change prices to match supply and demand. Electricity markets are 24/7 and prices range from negative to extremely high to maintain supply and demand in perfect balance. When there is excess renewable production, shut down other production like Natural Gas. There is zero fuel cost. If other productions can't be shut down, change the price to negative, charge EVs and pay them money for letting us use their storage capacity.