The world relies more and more on energy and thus generates more heat as a byproduct. Current solutions are limited to venting the wasted heat or, in extremely limited cases, reusing that heat for novel purposes such as local community pools or heating for buildings, but the issue for all of those is you have to be near a massive datacenter that has to have been designed for that from the beginning.
This represents a massive opportunity for innovation. Billions of BTUs of heat energy are simply wasted every day, while consumers continue to pay high costs for water heating in their homes.