There's not a lot of options yet for base load. We need a lot more storage, or an environmentally friendly and reliable source for base load. Nuclear would fit, clearly, but it's not financially viable, moreso than coal right now. It's a very hard problem, and it'll take time to sort out with "the market", but building storage from dams and lakes and reservoir would be a good start. Batteries might not be the best for the environment unless we can efficiently recycle the minerals in them rather than mine them, since that is almost as bad as mining the coal. We should also look into geothermal and other sources that we've left behind in favor of oil and coal.

Edit: I'm "posting too fast" so i can't reply, but thanks for the comment about batteries, they're good for decarbonization but maybe not great for the environment in the mining of the materials. Maybe that's an okay trade off.