Prices of (fill in the blank energy commodities) are strictly fictional, be they gasoline, electricity, whatever. To wit: Big Spring Tx has a refinery servicing a part of west Tx. 35 miles west, in Midland, gas is 3.07 whereas 35 miles east, in Colorado City, gas is 2.89...for the exact same gas, delivered by the exact same trucks...taking the exact same amount of time to get there, etc.
Electricity is all ‘owned’ by Oncor here, each distribution company buying their part for sales to end users...but it all comes over the same lines, thru the same sub stations, etc etc etc owned by Oncor. Any price differences are basically different rats allowing different pieces of cheese to fall
Oncor also owns the natural gas in the part of world.