Running cost for the GE GBP420S*P***
The GE GBP420S*P*** is certified by ENERGY STAR at 234 kWh a year, about average for its category to run among dishwashers currently certified.
That $44 is priced at 18.8¢/kWh, the average of all 51 state rates this site tracks. Your own state's rate is one click away.
Efficient, or not, for a dishwasher
The category average is 232 kWh/yr; this model runs 0.9% above it, ranking 223 of 737 dishwashers tracked here for running cost. That average is drawn from all 737 dishwashers ENERGY STAR currently certifies, not an outside number, a $0/year gap from this model at the national rate. Full sourcing is in the sourcing notes.
Right next to it on the list
A rank or two either side of the GE GBP420S*P***: GE GBF655S*P*** ($44/yr, 234 kWh/yr), then GE GBP534S*P*** ($44/yr, 234 kWh/yr).
Within the GE lineup
Ranked 7 of GE's 41 certified dishwashers, this sits between the GBF180S*M*** ($44/yr, the brand's cheapest) and the UDT16***V*** ($45/yr, its priciest).
GE GBP420S*P*** over 9 years
Over the 9-year service life NAHB reports for this category, running the GE GBP420S*P*** costs roughly $396 in electricity, separate from the purchase price.
Shopping for a new one
Efficient as certified dishwashers go, $44/year is a reasonable baseline if you're comparing what else is on the market.
See what else is certified in this category before you decide.
If you're keeping it
The GE GBP420S*P*** already costs $44/year to run; a repair bill on top of that is the kind of expense a protection plan exists to smooth out.
Where this number comes from
At rank 223 of 737 for running cost, see the dishwasher category page for the rest of the field, or the guide to how much your state matters. The 234 kWh/yr figure is ENERGY STAR's own certification, not a wattage estimate; exact dataset IDs are on the data sources page.