The final missing piece to this puzzle of “too much” solar energy is bi-directional charging (aka #V2H & #V2G).
The wholesale electricity price in the middle of Australian sunny days has dropped to zero and even negative!
Before the "cheaper home batteries program" came along, our home batteries and EVs (for driving) were only using around 13.6% of the new solar generation being installed each month. Of course some of the new solar electricity was going to other electrification uses like electric hotwater/heatpumps, pool pumps, induction cooking, and heating and cooling.
The rapid installation of home batteries under the program, along with our EVs, are now almost keeping up with the new small scale solar PV installs, absorbing around 84.6% of the new solar electricity.
If we could harness all the new EVs fully, to charge up during the day using this "free" energy and then discharge at night, of course leaving enough for expected driving the next morning, we could start to soak up some of the solar surplus from the past solar PV installs, and lower electricity prices for everyone.