In my old hometown, Östersund, they're busy connecting the sewage works to a heat exchanger at a ... whatchacallit... remote heater? A central, highly efficient heat creation facility, from which heat is piped to houses in the surrounding area? Instead of having to spend lots of money to cool the sewage to keep it at an optimal temperature for the bacteria, they use it.
They've already fitted one of those whatever they're called to the town dump, taking advantage both of the heat generated by the decomposing waste, and burning the generated methane.
But now of those examples are as amusing as the cider-heated pool, I admit.