Garage Door Opener Electricity Cost: Standby Power Is the Real Bill (2026 Data)

A 350-watt opener running for 15 seconds uses 1.46 watt-hours per cycle. At the April 2026 US average rate of 18.05 cents per kWh from the EIA Electric Power Monthly, that's 0.03 cents per opening. Not 3 cents. Three hundredths of a cent. A 750-watt unit on a heavy insulated door costs 0.06 cents per cycle.

Four to six trips a day adds up to about 72 seconds of motor time. At 350 watts that's 0.007 kWh per day, 2.56 kWh for the full year, and 46 cents on the bill. Double the usage to roughly ten trips a day for a busy household and the motor still costs 92 cents. Under a dollar either way.

To put that in perspective, a year of opening the garage door costs less than a single hour of running a space heater. The 350-watt spec on the nameplate sits in the same range as a gaming PC at idle. The difference is the PC idles for hours. The garage door operates for seconds.

Every garage door opener has a transformer that stays energized 24 hours a day. It powers the radio receiver that listens for the remote, the safety-sensor circuit, indicator LEDs, and on newer models, a wifi module. That transformer draws anywhere from 2 to 15 watts whether the door moves or not.

Annual standby cost at the US average rate: 2 watts (newer DC-motor opener): 17.52 kWh, $3.16. 5 watts (typical smart opener): 43.8 kWh, $7.91. 10 watts (older AC opener with safety lights): 87.6 kWh, $15.81. 15 watts (legacy opener with courtesy light on): 131.4 kWh, $23.72.

The ratios tell the story. At 2 watts, standby costs 7 times the motor. Five watts makes it 17 times. Ten watts, 34 times. Fifteen, 52 times. A 15-watt opener's standby costs the same as running a wifi router for a year. The router has to be on. The garage opener is just waiting for a signal that fires a few times a day.

The three major residential brands have nearly identical motor costs per year. Genie SilentMax at 325 watts: $0.43. Chamberlain B6753T at 350 watts: $0.46. LiftMaster 8550WLB at 400 watts: $0.53. The spread from cheapest to most powerful motor is 10 cents a year.

The standby spread from a 2-watt DC opener to a 15-watt legacy unit is $20.56 a year. Standby wattage matters roughly 200 times more than motor wattage for the annual bill. A Kill-A-Watt meter on the outlet for 24 hours with no door cycles tells you exactly where your opener falls on the standby ladder.

DC-motor openers are marketed as 40% more efficient than AC models. That's true during the actual lift, but 40% of 46 cents is 18 cents a year. The real DC-motor payoff is lower standby power: 2 to 3 watts versus 5 to 15 watts on older AC units. Dropping from 10 watts to 2 saves 70 kWh and $12.65 a year. Over a 15-year opener lifespan, that's $190 in reduced standby cost. Not enough to justify replacing a working unit, but the right factor to weight when the old one fails.

A 5-watt-standby opener uses about 46 kWh a year including motor time. The state rate is the only variable:

Louisiana (12.44¢/kWh): $5.77. Texas (14.80¢/kWh): $6.86. US average (18.05¢/kWh): $8.37. New York (24.40¢/kWh): $11.31. California (31.01¢/kWh): $14.37. Hawaii (39.79¢/kWh): $18.44.

Hawaii costs 3.2 times Louisiana for the same opener doing the same work. In California, a 10-watt legacy opener crosses $27 a year. Still not large, but that's $27 spent on a device listening for a remote signal. Every state's 2026 rate is in the state rates guide.

Most openers fall in the $4 to $16 per year range depending on standby wattage and state rate. At the low end, a DC-motor opener with 2-watt standby costs less than 30 cents a month anywhere in the country. At the high end, a legacy AC opener pulling 15 watts sits around $2 a month at the national average.

For context, a wifi router at 15 watts costs $23.72 a year. A typical garage opener at 5 watts of standby costs $8.37. About a third as much. Both devices stay on around the clock. The router just draws more.

A garage door opener won't appear on any list of expensive appliances. It lives in the same territory as a smart bulb or an LED strip: a standby-dominant load that costs single digits per year. The standby is worth knowing about. It isn't worth losing sleep over.

If you're already replacing an aging opener, a DC-motor model is the better pick for electricity. The motor efficiency gain is pocket change (18 cents a year). The standby reduction from 10 to 15 watts down to 2 to 3 watts saves $5 to $20 annually. Over 15 years that's $75 to $300 in lower standby cost. Not a reason to swap a working unit, but the right spec to check when the old one finally quits.

The garage door opener calculator takes your opener's wattage, standby draw, and state rate, and returns the monthly and yearly cost. For most homes, the answer confirms what the math here says: the door itself costs pennies, and the transformer costs the rest.