Running cost for the Marathon M4-150BLS
The Marathon M4-150BLS is certified by ENERGY STAR at 134 kWh a year, one of the cheaper models in its category to run among refrigerators currently certified.
That $25 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 refrigerator
Against the category average of 386 kWh/yr, this model uses 65.3% less, ranking 63 of 4,704 refrigerators tracked here for running cost. That average is drawn from all 4,704 refrigerators ENERGY STAR currently certifies, not an outside number, a $47/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 Marathon M4-150BLS: Marathon M4-100SS ($25/yr, 134 kWh/yr), then Marathon M4-150PANR ($25/yr, 134 kWh/yr).
Same brand, different models
Ranked 4 of Marathon's 57 certified refrigerators, this sits between the M4-100BLS ($25/yr, the brand's cheapest) and the MFF208WFD-2 ($87/yr, its priciest).
Marathon M4-150BLS over 13 years
NAHB's Study of Life Expectancy of Home Components puts a typical refrigerator's service life at 13 years; run the Marathon M4-150BLS that long and it costs about $327 in electricity, on top of whatever it cost to buy.
Weighing a replacement
Efficient as certified refrigerators go, $25/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
At $25/year just to run, a refrigerator is worth protecting against an unplanned repair bill on top of that.
Where this number comes from
At rank 63 of 4,704 for running cost, see the refrigerator category page for the rest of the field, or the guide to how much your state matters. The 134 kWh/yr figure is ENERGY STAR's own certification, not a wattage estimate; exact dataset IDs are on the data sources page.