Model
Lg OLED77B5***
Rank #157 means 156 of the 172 television models we track cost less to run each year; the 6th efficiency percentile means it uses less energy for its size than 6% of those models.
What does the Lg OLED77B5*** cost to run per year?
The Lg OLED77B5*** holds rank #157 of 172 on running cost, at about $64 a year, a genuinely pricey result for the class. Capacity-normalized, it ranks ahead of just 6% of television models we track, a clearly below-average result. Its on-mode draw of 176.4 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 86QNED90TU* at $63/yr runs a little cheaper and the Lg OLED77C5*** at $64/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 OLED77B5***'s $64/yr adds up to roughly $448 in electricity alone, before purchase price or repairs.
Also sold as: Lg OLED77C5***.
By the numbers
The Lg OLED77B5*** 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 $64/yr, here is what the Lg OLED77B5*** 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 OLED77B5*** costs about $640. That is roughly $290 more than the class median, which would run closer to $350 over the same ten years.
How the Lg OLED77B5*** compares
The television class we track runs from $3 to $117 a year. At $64/yr, it runs about $29 a year above the class median of $35, and it is about $61 a year more than the cheapest television to run at $3.
What drives its running cost
At 76.7 in, the Lg OLED77B5*** 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. Its on-mode power draw of 176.4 W (the class spans 9.3 to 343.5 W) is the direct input into the running-cost figure, and the picture-brightness setting you choose is the single biggest lever you control over it day to day.
- 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 OLED77B5*** cheap to run?
Its $64/yr running cost, rank #157 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 OLED77B5*** cost per month?
About $5.32 a month, which is the $64 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: 344 kWh from ENERGY STAR times the US average of $0.1856/kWh comes to about $64 a year. It covers electricity only, not the purchase price, water, or installation.
How efficient is the Lg OLED77B5*** for its size?
6th 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 |
|---|---|---|
| 156 | Lg 86QNED90TU*85.6 in | $63 |
| 155 | Lg OLED83B5PU*82.5 in | $61 |
| 154 | Samsung QN75QN95DAF74.6 in | $60 |
| 153 | Samsung QN77S95HAF76.8 in | $59 |
| 152 | Samsung QN77S95FAF76.8 in | $58 |
Source
ES_1118034_OLED77B5***_010920250634117_6970181View certified television listingsENERGY STAR data as of July 2026Lg and OLED77B5*** 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.