Check out this cool app created by The University of Texas at Austin Energy Institute. It allows you to see what the lowest electricity generation source is on a county level throughout the US. Seeing the levelized cost of electricity (LCOE) is interesting but should not be confused with the retail cost of electricity. Based on a quick look it appears that the LCOEs reflected are lower than retail residential but higher than commercial electricity rates.

https://calculators.energy.utexas.edu/lcoe_map/#/county/cost