1. Adding power to a city with a factory bumps up the production bonus from 25% to 50%. As such, I can only assume that there is no advantage to building multiple Power Plants in a single city (Coal, Nuclear, Hydro, Three Gorgess Dam Wonder on continent), but nevertheless the game still allows you to do this. To me this seems a bug.
(Question: If you already have a coal plant, and then you build, say, a hydro plant on top of it does the hydo plant render the coal plant completely obsolete and eliminate the latter's health penalty?)
(Question: If you already have a coal plant, and then you build, say, a hydro plant on top of it does the hydo plant render the coal plant completely obsolete and eliminate the latter's health penalty?)