Maybe they should have let the Empire run that thing and go bankrupt on it? British energy provider Ovo has calculated the money it would cost to power that thing - A meagre £6,254,254,800,000,000,000,000,000,000. Per Day.

I can’t quite follow the calculation, as it includes jumping to hyperspace and firing/recharging the Superlaser, which would of course not be a daily occurrence. Also, after reading Catalyst, I know they have Mads Mikkelsen working on the superlaser crystal, I assume he’d find a cost effective way. Still - it’s a pretty steep price...

https://www.ovoenergy.com/blog/energy/as-rogue-one-arrives-in-cinemas-we-estimate-the-cost-of-powering-the-death-star.html