A 277% spread between the cheapest and priciest state

Hawaii charges residential customers about 45.95¢/kWh, roughly 3.8x what North Dakota charges at 12.19¢/kWh. The identical appliance costs proportionally more or less to run purely on that basis, before the model's own efficiency even enters into it.

What that does to a real appliance

The ABL AREF18**, at its certified 360 kWh/yr, costs about $44/year to run in North Dakota and about $165/year in Hawaii, the same unit, same usage, only the rate changed.

Why it varies

State electricity rates reflect generation mix, transmission distance, regulatory structure, and, for import-dependent grids like Hawaii's, the cost of getting fuel there at all. This site doesn't model why a state's rate is what it is, only reports EIA's own published state-average figure, which is why every model page has a state selector rather than one blended national number.

State averages, not per-utility rates

These are state averages, not per-utility rates; a true per-utility figure needs an EIA API key this site doesn't hold. Your own utility bill is the only fully precise source for your exact rate, but a state average is a real, sourced starting point a nameplate-wattage guess is not.