How much would it cost to run the Death Star?

The British energy supplier Ovo has put some very well-spent hours into a comprehensive calculation of the operating costs of the Death Star. They conclude that operating the planet-destroying starbase would cost 6.2 octillion British pounds, or $7.8 octillion (C$10.40 octillion), per day — that’s $7,800,000,000,000,000,000,000,000,000.

Source: OVO Energy