Data through June 2026
Running cost · Computer Monitors · ENERGY STAR certified
BenQ GW2491-L
At the standardized usage ENERGY STAR assumes, the BenQ GW2491-L consumes 39 kWh a year — about $7.13 at the U.S. average electricity rate ($0.59 a month). That's 14% less than the median certified computer monitor, placing it comfortably in the efficient third of the field (447 of 1530). Where you live moves the bill from $5.10 a year in Nevada to $21 in Hawaii.
Estimated annual running cost · U.S. average rate 18.3¢/kWh
$7.13/yr
- Per month
- $0.59
- Per day
- 2¢
- Certified use
- 39 kWh/yr
- Screen size
- 23.8 in
- Panel
- TFT-LCD
- On-mode power
- 12.33 W
- Sleep-mode power
- 0.19 W
What it costs in every state
| State | Rate ¢/kWh | This model $/yr | Relative cost |
|---|---|---|---|
| Alabama | 16.4¢ | $6.38 | |
| Alaska | 28.2¢ | $11 | |
| Arizona | 15.2¢ | $5.90 | |
| Arkansas | 14.1¢ | $5.49 | |
| California | 34.7¢ | $14 | |
| Colorado | 17.1¢ | $6.66 | |
| Connecticut | 24.3¢ | $9.46 | |
| Delaware | 19.3¢ | $7.50 | |
| District of Columbia | 24.4¢ | $9.49 | |
| Florida | 15.1¢ | $5.87 | |
| Georgia | 16.4¢ | $6.36 | |
| Hawaiipriciest | 52.7¢ | $21 | |
| Idaho | 14.4¢ | $5.59 | |
| Illinois | 19.9¢ | $7.74 | |
| Indiana | 17.5¢ | $6.81 | |
| Iowa | 15.9¢ | $6.20 | |
| Kansas | 15.7¢ | $6.11 | |
| Kentucky | 14.3¢ | $5.55 | |
| Louisiana | 13.5¢ | $5.25 | |
| Maine | 29.6¢ | $12 | |
| Maryland | 21.8¢ | $8.49 | |
| Massachusetts | 29.6¢ | $12 | |
| Michigan | 23.0¢ | $8.94 | |
| Minnesota | 17.5¢ | $6.81 | |
| Mississippi | 14.9¢ | $5.79 | |
| Missouri | 16.2¢ | $6.31 | |
| Montana | 15.1¢ | $5.89 | |
| Nebraska | 13.3¢ | $5.15 | |
| Nevadacheapest | 13.1¢ | $5.10 | |
| New Hampshire | 27.0¢ | $11 | |
| New Jersey | 24.9¢ | $9.70 | |
| New Mexico | 15.1¢ | $5.86 | |
| New York | 29.5¢ | $11 | |
| North Carolina | 14.7¢ | $5.73 | |
| North Dakota | 14.1¢ | $5.49 | |
| Ohio | 19.2¢ | $7.46 | |
| Oklahoma | 14.3¢ | $5.57 | |
| Oregon | 16.3¢ | $6.35 | |
| Pennsylvania | 21.7¢ | $8.45 | |
| Rhode Island | 29.2¢ | $11 | |
| South Carolina | 15.6¢ | $6.05 | |
| South Dakota | 15.4¢ | $5.97 | |
| Tennessee | 14.1¢ | $5.47 | |
| Texas | 15.9¢ | $6.20 | |
| Utah | 13.4¢ | $5.20 | |
| Vermont | 24.4¢ | $9.50 | |
| Virginia | 17.2¢ | $6.70 | |
| Washington | 14.9¢ | $5.80 | |
| West Virginia | 15.4¢ | $6.01 | |
| Wisconsin | 19.6¢ | $7.61 | |
| Wyoming | 15.2¢ | $5.93 |
Certified models closest in efficiency
| Model | kWh/yr | $/yr (US avg) |
|---|---|---|
| Acer CB242Y | 39 | $7.13 |
| Acer CB242Y | 39 | $7.13 |
| MSI PRO MP252L | 39 | $7.13 |
| AOC 22B2D | 39 | $7.14 |
| DELL SE2425HMf | 39 | $7.12 |
| HP OMEN 24e | 39 | $7.14 |
Run your own numbers
Your rate, your numbers
- Per day
- 2¢
- Per month
- $0.60
- Per year
- $7.15
39 kWh/yr × 18.3¢/kWh = $7.15/yr
Prefilled with this model's certified 39 kWh/yr — adjust if your usage differs from the DOE test basis. The certified annual kWh (TEC) assumes the monitor is on 35% of the day and asleep the other 65%, per the ENERGY STAR test basis.
Questions, answered with the data
- How much electricity does the BenQ GW2491-L use?
- ENERGY STAR certifies the BenQ GW2491-L at 39 kWh per year. The certified annual kWh (TEC) assumes the monitor is on 35% of the day and asleep the other 65%, per the ENERGY STAR test basis.
- How much does the BenQ GW2491-L cost to run per month?
- About $0.59 a month at the U.S. average residential rate (18.3¢/kWh) — 2¢ a day, or $7.13 a year. Your state's rate moves this up or down; see the table above.
- Is the BenQ GW2491-L energy efficient?
- It uses 14% less electricity than the median certified computer monitor, placing it in the efficient third of certified models.
- What does the BenQ GW2491-L cost to run in the cheapest vs. priciest state?
- At current residential rates it costs about $5.10 a year in Nevada (13.1¢/kWh) and $21 in Hawaii (52.7¢/kWh).