A lot of times, you'll have multiple options that provide solutions to a given problem. Not all options are created equal, though, so carefully weigh the pros and cons before you choose your method. When it comes to power, coal is cheap and effective, but it can lead to upset residents down the line. You're better of paying for an expensive power source up front. And fires are very much a concern in your bustling city, so make sure you place a Large Firehouse in a central location. It can cover a lot more area than a smaller one, and that's critical.