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Data through June 2026

Running cost · Computer Monitors · ENERGY STAR certified

BenQ GW2790C-B

At the standardized usage ENERGY STAR assumes, the BenQ GW2790C-B consumes 31 kWh a year — about $5.67 at the U.S. average electricity rate ($0.47 a month). That puts it in the most efficient tenth of every certified computer monitor — 31% less electricity than the median, ranked 130 of 1530. The same unit costs $4.05 a year in Nevada but $16 in Hawaii — electricity rates, not the appliance, make the difference. It also meets ENERGY STAR's stricter “Most Efficient” criteria.

Estimated annual running cost · U.S. average rate 18.3¢/kWh

$5.67/yr

$2.04 · cheapest certified computer monitors$74 · priciest
Per month
$0.47
Per day
2¢
Certified use
31 kWh/yr
Screen size
27 in
Panel
IPS LCD
On-mode power
9.8 W
Sleep-mode power
0.15 W
11 kWh403 kWh
Where the BenQ GW2790C-B (▮) sits among all 1,530 certified computer monitors, by annual kWh

What it costs in every state

BenQ GW2790C-B: 31 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$5.07
Alaska28.2¢$8.72
Arizona15.2¢$4.69
Arkansas14.1¢$4.36
California34.7¢$11
Colorado17.1¢$5.29
Connecticut24.3¢$7.51
Delaware19.3¢$5.96
District of Columbia24.4¢$7.54
Florida15.1¢$4.67
Georgia16.4¢$5.06
Hawaiipriciest52.7¢$16
Idaho14.4¢$4.44
Illinois19.9¢$6.15
Indiana17.5¢$5.41
Iowa15.9¢$4.92
Kansas15.7¢$4.85
Kentucky14.3¢$4.41
Louisiana13.5¢$4.17
Maine29.6¢$9.14
Maryland21.8¢$6.75
Massachusetts29.6¢$9.15
Michigan23.0¢$7.10
Minnesota17.5¢$5.41
Mississippi14.9¢$4.60
Missouri16.2¢$5.01
Montana15.1¢$4.68
Nebraska13.3¢$4.09
Nevadacheapest13.1¢$4.05
New Hampshire27.0¢$8.35
New Jersey24.9¢$7.71
New Mexico15.1¢$4.65
New York29.5¢$9.11
North Carolina14.7¢$4.55
North Dakota14.1¢$4.36
Ohio19.2¢$5.93
Oklahoma14.3¢$4.43
Oregon16.3¢$5.04
Pennsylvania21.7¢$6.71
Rhode Island29.2¢$9.03
South Carolina15.6¢$4.80
South Dakota15.4¢$4.75
Tennessee14.1¢$4.35
Texas15.9¢$4.93
Utah13.4¢$4.13
Vermont24.4¢$7.55
Virginia17.2¢$5.32
Washington14.9¢$4.61
West Virginia15.4¢$4.77
Wisconsin19.6¢$6.04
Wyoming15.2¢$4.71

Certified models closest in efficiency

computer monitors within reach of 31 kWh/yr
ModelkWh/yr$/yr (US avg)
Acer B247Ymost efficient31$5.67
EIZO FlexScan S193431$5.67
ViewSonic VS20870most efficient31$5.68
ASUS VA24DQFmost efficient31$5.65
DELL P2225Hbmost efficient31$5.69
DELL E2226Htmost efficient31$5.64

Run your own numbers

Your rate, your numbers

Per day
2¢
Per month
$0.47
Per year
$5.69

31 kWh/yr × 18.3¢/kWh = $5.69/yr

Prefilled with this model's certified 31 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 GW2790C-B use?
ENERGY STAR certifies the BenQ GW2790C-B at 31 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 GW2790C-B cost to run per month?
About $0.47 a month at the U.S. average residential rate (18.3¢/kWh) — 2¢ a day, or $5.67 a year. Your state's rate moves this up or down; see the table above.
Is the BenQ GW2790C-B energy efficient?
It uses 31% less electricity than the median certified computer monitor, placing it in the top 10% of certified models. It also meets ENERGY STAR's Most Efficient criteria.
What does the BenQ GW2790C-B cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $4.05 a year in Nevada (13.1¢/kWh) and $16 in Hawaii (52.7¢/kWh).

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