Model
Lg OLED77B4PU*
Rank #129 means 128 of the 172 television models we track cost less to run each year; the 41st efficiency percentile means it uses less energy for its size than 41% of those models.
What does the Lg OLED77B4PU* cost to run per year?
At about $49 a year, the Lg OLED77B4PU* costs more to run than most television models we track, rank #129 of 172. Its size-adjusted efficiency percentile of 41 lands in the middle of the pack once capacity is accounted for. Its on-mode draw of 142.8 W is the number ENERGY STAR measures directly and the one this running-cost figure is built from.
Immediately around it on the leaderboard, the Lg 86QNED82AU* at $49/yr runs a little cheaper and the Lg 86QNED85AU* at $49/yr runs a little more, a sense of how tightly models are packed at this point in the ranking. A television typically stays in service for somewhere around 7 years; over that span, the Lg OLED77B4PU*'s $49/yr adds up to roughly $343 in electricity alone, before purchase price or repairs.
By the numbers
The Lg OLED77B4PU* normalized against its whole class, so each figure means something.
What it costs you over time
Running cost is an every-year number, so it compounds. At $49/yr, here is what the Lg OLED77B4PU* adds up to before purchase price, water, or repairs enter the math.
Left running for a decade at today's US average rate, the Lg OLED77B4PU* costs about $490. That is roughly $140 more than the class median, which would run closer to $350 over the same ten years.
How the Lg OLED77B4PU* compares
The television class we track runs from $3 to $117 a year. At $49/yr, it runs about $14 a year above the class median of $35, and it is about $46 a year more than the cheapest television to run at $3.
What drives its running cost
At 76.7 in, the Lg OLED77B4PU* is a large television for its class, which spans 13.23 to 114.4 in with a median of 55 in, among television models, bigger capacity is the most common reason a running-cost figure lands on the high side, all else being equal. At 142.8 W on-mode (the class spans 9.3 to 343.5 W), its power draw is what ENERGY STAR actually measured to produce this running-cost figure; brightness settings move that wattage more than screen size alone.
- On-mode brightness. On-mode watts, the figure ENERGY STAR measures at the factory picture setting, can differ a lot from what a TV actually draws once you change the picture mode.
- Screen size. Screen size is the single strongest predictor of a TV's on-mode wattage, ahead of panel technology or brand.
- Hours of use. Running cost compounds with hours of use, so this figure is really a per-hour rate multiplied by a standard viewing assumption, not a fixed annual bill.
Common questions
Is the Lg OLED77B4PU* cheap to run?
Its $49/yr running cost, rank #129 of 172, is above what most television models we track cost to run, so this is not one of the cheaper picks on electricity alone.
How much does the Lg OLED77B4PU* cost per month?
About $4.07 a month, which is the $49 annual estimate spread across twelve months at the US average rate of $0.1856/kWh. Your own bill scales with your local electricity rate and how heavily you use it.
How is this running-cost figure calculated?
The formula is annual kWh times price per kWh: 263 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $49 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Lg OLED77B4PU* for its size?
41st percentile once size is factored in. That means its size-adjusted efficiency is not the main reason for the running-cost figure above; its capacity plays a large role too.
Cheaper to run in the same class
| Rank | Model | Cost/yr |
|---|---|---|
| 128 | Lg 86QNED82AU*85.6 in | $49 |
| 127 | Lg OLED65C6PU*64.5 in | $48 |
| 126 | Lg 75QNED85TU*74.5 in | $48 |
| 125 | Lg 75QNED90TU*74.5 in | $48 |
| 124 | Samsung QN65S90DAF64.5 in | $47 |
Source
ES_1118034_OLED77B4PU*_122120230719523_8888606View certified television listingsENERGY STAR data as of July 2026Lg and OLED77B4PU* are used here for identification only and are not endorsements. Figures are computed by WattWise Labs from public ENERGY STAR data, not measured in our own lab.