Building something genuinely new, like caching electricity, is fraught with technical risks, financial risks, and regulatory hurdles. It's the kind of thing that can put a billion-dollar enterprise out of business. So expect a decade or more of research, small-scale experiments, political negotiation, and more, to bring storage online at any sort of scale. It's really, really hard, and really risky.

Nuclear plants, as you probably know, are almost pure base load solutions. They can't just be scaled up or slowed down arbitrarily. A volatile, arbitrage-based market efficiency would be pretty hard on the existing nuclear base, and could render a lot of plants unprofitable.

Meanwhile, the gas-fired peak load plants are tremendously expensive, because they have so much downtime and are inefficient. One or two decades ago, competing against them with storage was economically impractical. Now, it's becoming feasible. Especially once we start building gigawatts of sitting capacity anyway, in the shape of EV cars.