AN ADVANTAGE TO ALL
Instead of searching for unused land, an obvious solution could be to
look into opportunities of converting old and maybe even polluted industry lots
into sustainable solar heating installations.
Trustrup-Lyngby heating station in Denmark is a great example of just that. It turned out that an area just opposite the heating station was becoming vacant as an old factory that used to produce feed for the mink industry unexpectedly decided to stop the production. As the heating station was about to be modernized, they did not hesitate to take advantage of the situation and also had the full support of the local authorities (Norddjurs Kommune) who recognized the chance to get rid of a factory ruin and instead end up with a renewable energy solution.