Prices going negative is Capitalism's solution actually. Gives the price incentive for folks to charge their cars when prices go negative, or whatever.
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I hate to be the akshully guy but the big problem isn’t economics but usage. We can’t store electricity at any kind of meaningful scale so generation needs to be balanced to meet demand. Unused excess power needs to go somewhere, hence the negative prices (the market way of saying, “please somebody take this electricity it’s doing more harm than good on the grid”).
I like the system where the excess power is used to pump water into a reservoir up a mountain and when power is needed it runs it down a turbine into a lower reservoir.
Most places where this can be done, it is already being done. The low hanging fruit for pumped hydro was all picked decades ago, and at great cost to the ecosystems it destroyed in the process - turns out that drowning thousands of acres in massive man-made lakes had a bit of an impact on the plants and animals that lived there.
Not saying that the benefits weren't worth the cost, that's a whole different debate. But there's little to no opportunity to scale this energy storage tech beyond it's current footprint.