$1:
I'd guess there are probably more people working just at gas stations than there are installing solar panels and wind turbines, nevermind extraction, refining, transportation, value-added petrochemical industries, etc.
Never been to a gas station?
There's usually one teenager working for as little pay as legally possible running the pumps, a convenience store and a lottery centre all at once while the owned is at the Taxpayer Federation lobster dinner convention whining about how $10 an hour is driving him bankrupt.
We're lucky enough to have one full service station on the rez specifically run to provide jobs and training to as many as possible. It's the only one within 100 miles.