What should the grid operators do with all that energy that comes in at noon on a beautiful sunny day?
There's a point where the grid has so much solar power that we need to start shedding production as a general rule and not just as an intermittent temporary measure, but I don't think we're anywhere near that point.
One can imagine a setup where you've got a hot water tank and a mixing valve that allows you to heat your water up to some very high temperature and then mix that down to "safe" hot water for the house. Have that run in "heat from grid if below this threshold, otherwise conditionally heat with surplus energy if the water's below this temperature"