The electric power produced by "peaker plants" (e.g. gas turbines, hydroelectric, pumped storage) will become more important. If there aren't enough of those, the cost to buy power from peaker plants will rise and investors will build more of them.

More long distance transmission lines will be built to average out local variation in production.

Grid-scale battery systems like brine4power may start to come online.

Excess power may be dumped into power-to-gas systems which enrich natural gas with hydrogen.