Data through June 2026
Running cost · Computer Monitors · ENERGY STAR certified
BenQ GW2780-B
At the standardized usage ENERGY STAR assumes, the BenQ GW2780-B consumes 40 kWh a year — about $7.41 at the U.S. average electricity rate ($0.62 a month). That's 10% less than the median certified computer monitor, placing it comfortably in the efficient third of the field (527 of 1530). The same unit costs $5.30 a year in Nevada but $21 in Hawaii — electricity rates, not the appliance, make the difference.
Estimated annual running cost · U.S. average rate 18.3¢/kWh
$7.41/yr
- Per month
- $0.62
- Per day
- 2¢
- Certified use
- 40 kWh/yr
- Screen size
- 27 in
- Panel
- IPS LCD
- On-mode power
- 12.9 W
- Sleep-mode power
- 0.2 W
What it costs in every state
| State | Rate ¢/kWh | This model $/yr | Relative cost |
|---|---|---|---|
| Alabama | 16.4¢ | $6.63 | |
| Alaska | 28.2¢ | $11 | |
| Arizona | 15.2¢ | $6.13 | |
| Arkansas | 14.1¢ | $5.70 | |
| California | 34.7¢ | $14 | |
| Colorado | 17.1¢ | $6.92 | |
| Connecticut | 24.3¢ | $9.83 | |
| Delaware | 19.3¢ | $7.79 | |
| District of Columbia | 24.4¢ | $9.85 | |
| Florida | 15.1¢ | $6.10 | |
| Georgia | 16.4¢ | $6.61 | |
| Hawaiipriciest | 52.7¢ | $21 | |
| Idaho | 14.4¢ | $5.81 | |
| Illinois | 19.9¢ | $8.04 | |
| Indiana | 17.5¢ | $7.07 | |
| Iowa | 15.9¢ | $6.44 | |
| Kansas | 15.7¢ | $6.35 | |
| Kentucky | 14.3¢ | $5.76 | |
| Louisiana | 13.5¢ | $5.45 | |
| Maine | 29.6¢ | $12 | |
| Maryland | 21.8¢ | $8.82 | |
| Massachusetts | 29.6¢ | $12 | |
| Michigan | 23.0¢ | $9.29 | |
| Minnesota | 17.5¢ | $7.08 | |
| Mississippi | 14.9¢ | $6.01 | |
| Missouri | 16.2¢ | $6.55 | |
| Montana | 15.1¢ | $6.12 | |
| Nebraska | 13.3¢ | $5.35 | |
| Nevadacheapest | 13.1¢ | $5.30 | |
| New Hampshire | 27.0¢ | $11 | |
| New Jersey | 24.9¢ | $10 | |
| New Mexico | 15.1¢ | $6.08 | |
| New York | 29.5¢ | $12 | |
| North Carolina | 14.7¢ | $5.95 | |
| North Dakota | 14.1¢ | $5.70 | |
| Ohio | 19.2¢ | $7.75 | |
| Oklahoma | 14.3¢ | $5.79 | |
| Oregon | 16.3¢ | $6.59 | |
| Pennsylvania | 21.7¢ | $8.78 | |
| Rhode Island | 29.2¢ | $12 | |
| South Carolina | 15.6¢ | $6.28 | |
| South Dakota | 15.4¢ | $6.21 | |
| Tennessee | 14.1¢ | $5.68 | |
| Texas | 15.9¢ | $6.44 | |
| Utah | 13.4¢ | $5.40 | |
| Vermont | 24.4¢ | $9.87 | |
| Virginia | 17.2¢ | $6.96 | |
| Washington | 14.9¢ | $6.02 | |
| West Virginia | 15.4¢ | $6.24 | |
| Wisconsin | 19.6¢ | $7.90 | |
| Wyoming | 15.2¢ | $6.16 |
Certified models closest in efficiency
| Model | kWh/yr | $/yr (US avg) |
|---|---|---|
| Acer B246WL | 40 | $7.41 |
| DELL P2725Ht | 40 | $7.41 |
| DELL P2426b | 40 | $7.41 |
| DELL S2425Ht | 40 | $7.41 |
| PHILIPS 22E1N12 | 40 | $7.40 |
| PHILIPS 241V8 | 40 | $7.42 |
Run your own numbers
Your rate, your numbers
- Per day
- 2¢
- Per month
- $0.61
- Per year
- $7.34
40 kWh/yr × 18.3¢/kWh = $7.34/yr
Prefilled with this model's certified 40 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 GW2780-B use?
- ENERGY STAR certifies the BenQ GW2780-B at 40 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 GW2780-B cost to run per month?
- About $0.62 a month at the U.S. average residential rate (18.3¢/kWh) — 2¢ a day, or $7.41 a year. Your state's rate moves this up or down; see the table above.
- Is the BenQ GW2780-B energy efficient?
- It uses 10% less electricity than the median certified computer monitor, placing it in the efficient third of certified models.
- What does the BenQ GW2780-B cost to run in the cheapest vs. priciest state?
- At current residential rates it costs about $5.30 a year in Nevada (13.1¢/kWh) and $21 in Hawaii (52.7¢/kWh).