BTC providing demand for renewables stimulates the development of renewables. Any massive investment like in renewables carries a risk, and the higher the demand the lesser the risk for the investment on the supply side.
BTC + a very high carbon tax might actually be an interesting way to incentivize the desired overbuilding on renewables. But Texas is probably going to skip the second part.
Another interesting idea would be for the government to constantly buy any amount of energy produced by renewables at guaranteed price using tax money, and "distribute" it evenly to all enrgy users. This way people using least energy wouldn't pay for electricity at all and people building wind farms would have real good incentive to build more.
That is an interesting idea, I wonder how it would work out. Added benefit of just eating up any demand for energy, I guess crowding out any non-renewables. I bet administratively it would be easier than my idea -- people could proactively show they are selling renewables.
Battery is expensive and doesn't hold much. Nobody buys your hydrogen or heat an it needs to be made, stored and transported with losses that make this endeavor uneconomical (that's why nobody is doing it).
So you have two options really. Either partially sponsor your windturbin with bitcoins you'll mine with it or not build the turbin at all.
The current problem is not how to utilize every bit of excess energy. The current problem is where to get the money from to build capacity that will at time generate excess that is hard to transport away from the power station.
You've probably missed how a foundational technology for growing organs in the future is currently used to grow mice cells in-vitro as an ethical component of cat food.