Data through April 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 $7.61 at the U.S. average electricity rate ($0.63 a month). That's 10% less than the median certified computer monitor, placing it comfortably in the efficient third of the field (501 of 1482). The same unit costs $4.99 a year in North Dakota but $19 in Hawaii — electricity rates, not the appliance, make the difference.
Estimated annual running cost · U.S. average rate 18.8¢/kWh
$7.61/yr
- Per month
- $0.63
- 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 | 17.4¢ | $7.03 | |
| Alaska | 27.4¢ | $11 | |
| Arizona | 15.5¢ | $6.25 | |
| Arkansas | 14.2¢ | $5.72 | |
| California | 35.3¢ | $14 | |
| Colorado | 16.5¢ | $6.68 | |
| Connecticut | 32.2¢ | $13 | |
| Delaware | 18.8¢ | $7.59 | |
| District of Columbia | 25.4¢ | $10 | |
| Florida | 15.4¢ | $6.21 | |
| Georgia | 15.4¢ | $6.21 | |
| Hawaiipriciest | 46.6¢ | $19 | |
| Idaho | 12.7¢ | $5.13 | |
| Illinois | 20.5¢ | $8.27 | |
| Indiana | 17.9¢ | $7.23 | |
| Iowa | 13.9¢ | $5.60 | |
| Kansas | 15.8¢ | $6.38 | |
| Kentucky | 15.0¢ | $6.07 | |
| Louisiana | 14.4¢ | $5.83 | |
| Maine | 28.4¢ | $11 | |
| Maryland | 22.1¢ | $8.92 | |
| Massachusetts | 29.4¢ | $12 | |
| Michigan | 21.4¢ | $8.64 | |
| Minnesota | 16.4¢ | $6.62 | |
| Mississippi | 16.8¢ | $6.77 | |
| Missouri | 14.0¢ | $5.66 | |
| Montana | 13.9¢ | $5.62 | |
| Nebraska | 13.3¢ | $5.37 | |
| Nevada | 14.3¢ | $5.77 | |
| New Hampshire | 27.2¢ | $11 | |
| New Jersey | 23.5¢ | $9.51 | |
| New Mexico | 15.2¢ | $6.12 | |
| New York | 29.4¢ | $12 | |
| North Carolina | 16.3¢ | $6.57 | |
| North Dakotacheapest | 12.3¢ | $4.99 | |
| Ohio | 19.5¢ | $7.87 | |
| Oklahoma | 13.3¢ | $5.38 | |
| Oregon | 15.8¢ | $6.38 | |
| Pennsylvania | 21.5¢ | $8.67 | |
| Rhode Island | 28.3¢ | $11 | |
| South Carolina | 17.1¢ | $6.89 | |
| South Dakota | 14.5¢ | $5.87 | |
| Tennessee | 14.9¢ | $6.04 | |
| Texas | 17.0¢ | $6.86 | |
| Utah | 13.3¢ | $5.37 | |
| Vermont | 24.6¢ | $9.92 | |
| Virginia | 17.4¢ | $7.02 | |
| Washington | 14.4¢ | $5.80 | |
| West Virginia | 16.1¢ | $6.49 | |
| Wisconsin | 19.2¢ | $7.76 | |
| Wyoming | 14.7¢ | $5.93 |
Certified models closest in efficiency
| Model | kWh/yr | $/yr (US avg) |
|---|---|---|
| Acer B246WL | 40 | $7.61 |
| DELL P2725Ht | 40 | $7.61 |
| DELL P2426b | 40 | $7.60 |
| DELL S2425Ht | 40 | $7.60 |
| PHILIPS 22E1N12 | 40 | $7.60 |
| PHILIPS 241V8 | 40 | $7.61 |
Run your own numbers
Your rate, your numbers
- Per day
- 2¢
- Per month
- $0.63
- Per year
- $7.53
40 kWh/yr × 18.8¢/kWh = $7.53/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 $0.63 a month at the U.S. average residential rate (18.8¢/kWh) — 2¢ a day, or $7.61 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 $4.99 a year in North Dakota (12.3¢/kWh) and $19 in Hawaii (46.6¢/kWh).