We know a lot of ways to store power. The trick is storing it efficiently. If we have enough surplus power (which may be the case in a few years), efficiency becomes less important.
The hydrogen could be used for hydrogen vehicles and other purposes. Seawater desalination (very partially) addresses sealevel rise while also getting water to dry areas. Biochar sequesters carbon while helping more plants to grow with less water and less chemical fertilizer.
So from a certain point of view, the above pursuits are like investing most of your "excess money" in the stock market rather than putting most of it in a savings account. And since we're starting to address climate change so late we need something better than just a savings account or battery.
Charging EVs during daylight hours while they are parked at work places instead of overnight at employees homes is another way we can shift use. Some of these things might be done via pricing, others perhaps government incentives.