> Yes, the point with selling electricity is that you need to guarantee that you will deliver some fixed amount of electricity. If you depend on wind power plants how this guarantee can be given? What if wind stops.

Real-time bidding for prices already works at some places, but we need to modernize the whole electric system of the world. Smart grid was always part of the renewable solution.

> Maybe it would make sense to build huge bitcoin mining data centers and mine bitcoins in case of surplus. Hardly useful, but given current coins rush could be profitable. Better than paying producers for not producing energy.

It's already happening, but with all the negative conotations of Bitcoin mining, it's generally easier to listen to interviews with people working at energy companies than to discuss it on internet forums.