40 years of terrible energy policy. Electric rates have gone through the roof, too, despite the forests of wind turbines cropping up all around. It's damn near impossible to open a new refinery, nuclear plant, drill on federal land, build new pipelines (we still transport most of our oil by train), etc.
Ironically, natural gas production is booming and prices have been much more reasonable. People who bought those high efficiency heat pumps are actually better off not using them because it is cheaper to heat their homes with natural gas than electricity. (And yet, the federal government spent millions on tax credits to encourage people to buy said heat pumps).
Did I mention our energy policy is just so incredibly terrible? It's terrible.