> And are destroying every grid which they dominate. Germany, South Australia, California. When you start getting negative price events while the overall price increases something has gone very wrong with the market.
Yes, there has. There are still way too many inflexible legacy fossil and nuclear power plants producing electricity no one needs because the demand has been filled by renewables. What we need are storage, load-shedding (contrary to popular opinion, pausing energy intensive industry for a few minutes will not bring us back to the stone age) and, as a stop gap, flexible plants.
> You can either try and build batteries
No, that would be stupid. You're pretty sure of yourself for someone that apparently thinks batteries are the only storage technology.
> a transcontinental grid to share power, which costs trillions of dollars to build,
About 0.13 trillions, to be precise.[1]
> or nuclear power, which cost billions
Hinkley Point C is going to produce 3200MW at a build cost of ~25 billion USD. The EU had about 1TW of capacity in 2017. That's 312.5 Hickley Point Cs, costing 312.5*25=7812.5 billions.
The costs of waste disposal, eventual dismantling the plant and liability insurance (if anyone was actually willing to insure the risk nuclear power causes) is left as an exercise to the reader.
[1] https://www.theguardian.com/big-energy-debate/european-super...