The US has ~120,000 people employed at fossil fuel generation plants and about 65,000 employed in the coal mining industry.

http://www.eia.gov/todayinenergy/detail.cfm?id=19271

https://en.wikipedia.org/wiki/Coal_mining_in_the_United_Stat...

I guess lots of the 120,000 work at smaller gas plants.

There's ~1.6 million people directly employed as truck drivers.