That's a geothermal battery system with solar water heating as the input. But what's really cool about Drake Landing is that they can store energy from the summer to heat the homes in the winter, and they even hit net zero a few years ago.

Edit: No idea what the downvote is for... There's more info about this project here: https://en.wikipedia.org/wiki/Drake_Landing_Solar_Community

It's a little disappointing to learn it was decommissioned, but the technology for seasonal energy storage is really interesting.