My bet would be in part more A/C units.
40 years of technological progress and prices went up :(
Now in 2026 the main generators are EDF (French state owned), RWE (German), and Scottish Power (Spanish owned). These companies tend not to publish executive pay, but back in 2012 the CEO of EDF in the UK was being paid £1.2 million a year.
I would submit that all this has some bearing on why the prices have gone up.