It can be solar concentrator style generation and furnaces if you think big enough. Mobility and new frontiers could be enough incentive, but cargo transport, power infrastructure, hydrogen generation, and waste recovery would be advantageous. Large fixed platforms could solve a big part of the offloading problems. If the cells use standardized fittings, then cargo stations could swap hydrogen for co2 as ballast during offloading.

Aerial platforms would be great for telescopes and helicopters, too.