Cool tech/ideas. Not very practical.
Storing your excess energy in batteries for the night after the sun goes down is far, far, far more economical and practical and already in use.
Considering how much of energy is used for heating, this might still be interesting. But probably not for electricity generation
The problem is that turning heat to electricity using thermoelectric generators is hugely ineffecient. And there wouldn't be enough heat produced to create steam for steam turbines.
You are right, it would be nearly useless to generate electricity, but it could be use to save some. IIRC, heating of water and the home account for roughly 20% of power consumption. Harnessing that heat could help supplement those systems, thus saving a little electricity.
Everything about energy production and storage.
Related communities: