These states burn coal because it is locally sourced, plentiful and cheap. McConnel and Machin are looking out for their constituents. While here in California electricity prices are probably 3 times what they are in Kentucky and West Virginia.
Actually, the average electricity rate is 2x higher in Cali than it is in W Virginia and Kentucky. Very few states pay less than prices in California though. A lot of that has to do with the build out of the next gen grid based on wind, thermal, solar and hydro, plus the wild fire emergencies that have gotten worse over the last few years, thanks to climate change.
That said, it doesn't cost me a dime for my electricity. In fact, my electric company gives me a $400-$500 check at the end of every year, thanks to my solar panels. That also means my electric company is paying me to charge my Tesla every day! My excess electricity generation goes back into the grid to help, as well.
California currently generates 33% of electricity from renewable sources, while only 9% is coal fired. W Virginia and Kentucky generate 70% of their electricity from coal fired plants (highest in the nation). The amount of pollution from this is staggering, not to mention the people dying from black lung disease each year in these states continues to grow.
In about 50 years though, people in Kentucky and W Virginia will be paying a crap ton more than any state that is currently converting their grids to 100% renewables. McConnell and Manchin aren't looking out for their constituents, they are screwing them over by not converting. Jobs in renewables pay higher wages and they don't have the consequences of coal mining. By continuing with coal, you have short term gains at the expense of very long term consequences. McConnell and Manchin will get richer from coal lobbyists though, so that's cool.