We use whatever's near to hand. Electricity, mostly, though there are a few things that use magic, and some other arcane energies few understand, and fewer can wield.

As for crises... yes. My world is at war, after a meteorite struck it seventeen years ago and damaged or destroyed large parts of the planet. The few resources that remain are being fought over by the remaining factions, while everyone looks to space, and space looks back with heavy weapons to encourage us not to leave. So no, things haven't been resolved.

Oh, and I've spoken to a scientist working for the city already - they're making a few last-minute preparations before they're willing to bring us in to work on the energy issues, or so I was told.