If energy production--including its externalities--is too cheap to meter, all this is moot. However, if you're worried about time-shifting renewables, please no

If energy production--including its externalities--is too cheap to meter, all this is moot. However, if you're worried about time-shifting renewables, please note that it tends to get hot when the sun is shining. You can observe this in Florida (I kept my house at 73 cheaply with my solar panels), and California, where the duck curve has gone negative.