I cut my power bill significantly by moving 70 miles from the ERCOT region to the MISO region. This wasn't the reason for the move, but it was a happy side effect.

MISO/Entergy has some of the cheapest power out of all the US regions [0]. The heavy, fully-amortized coal mix combined with the Mississippi River makes for a hell of a combo. Barges can deliver fuel at a 2-3x lower cost than rail per ton-mile.

[0] https://www.entergytexas.com/wp-content/uploads/eti_rs.pdf