California – VERY expensive to live there compared to much of the rest of the USA.
Most all UK professional and trade qualifications are worth squat in the US. They have completely different associations and ways of doing things so the transfer of that side of things is far harder than academic quals.
You would need to qualify for straight immigration or find a company willing to sponsor you. Sponsorship tends to only happen if your skills cannot be found fast enough in the domestic market. Renewables is a good market in CA but it isn’t the boom it once was. The federal and state systems that go towards financing the renewables market are also hideous and, to a Brit, very complicated.
As for taking a few steps back for the work – you’re then getting into the really lower skilled end of the market and there will not be positions there for visa sponsorship.
I know you don’t want to hear this but I moved to the US from the UK 3.5 years ago (American wife) and I have more than a passing familiarity with the renewables industry here.
If you really want to move to the US, I would look at moving TO the US, THEN look at moving to where you want to be. If your wife doesn’t have transferable skills it could be a real backward step and see her unhappy without a decent job as well.
Education isn’t as big a deal as he said up there. In addition, a British accent gives you 10 more IQ points and far more gravitas!