[danuker]

Absolutely. Look at intraday electricity prices, and you see that the energy is cheapest when the sun is shining.

Problem is, if you use it for cooling, it's strictly better to use the electricity directly (chances are the sun is shining when it's hot).

And if you use it for heating (at least from day to night), the round-trip efficiency is probably still better for batteries, or electric heating + hot water storage, because you can use heat pumps which are say, 5x more efficient than burning fuel.

[marcosdumay]

Eh... There are more uses for fuel than cooling and heating.

If you have an stationary application you will never use something like that. (Except maybe for long time storage, I don't think this will win over long time storage, but it isn't settled.)