WattCost

Data through April 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 $5.82 at the U.S. average electricity rate ($0.48 a month). That puts it in the most efficient tenth of every certified computer monitor — 31% less electricity than the median, ranked 123 of 1482. The same unit costs $3.82 a year in North Dakota but $14 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 18.8¢/kWh

$5.82/yr

$2.09 · cheapest certified computer monitors$76 · priciest
Per month
$0.48
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 1,482 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
Alabama17.4¢$5.38
Alaska27.4¢$8.45
Arizona15.5¢$4.78
Arkansas14.2¢$4.38
California35.3¢$11
Colorado16.5¢$5.11
Connecticut32.2¢$9.96
Delaware18.8¢$5.81
District of Columbia25.4¢$7.85
Florida15.4¢$4.75
Georgia15.4¢$4.75
Hawaiipriciest46.6¢$14
Idaho12.7¢$3.92
Illinois20.5¢$6.33
Indiana17.9¢$5.53
Iowa13.9¢$4.28
Kansas15.8¢$4.88
Kentucky15.0¢$4.64
Louisiana14.4¢$4.46
Maine28.4¢$8.78
Maryland22.1¢$6.82
Massachusetts29.4¢$9.10
Michigan21.4¢$6.61
Minnesota16.4¢$5.06
Mississippi16.8¢$5.18
Missouri14.0¢$4.33
Montana13.9¢$4.30
Nebraska13.3¢$4.10
Nevada14.3¢$4.42
New Hampshire27.2¢$8.42
New Jersey23.5¢$7.27
New Mexico15.2¢$4.68
New York29.4¢$9.10
North Carolina16.3¢$5.02
North Dakotacheapest12.3¢$3.82
Ohio19.5¢$6.02
Oklahoma13.3¢$4.11
Oregon15.8¢$4.88
Pennsylvania21.5¢$6.63
Rhode Island28.3¢$8.74
South Carolina17.1¢$5.27
South Dakota14.5¢$4.49
Tennessee14.9¢$4.62
Texas17.0¢$5.25
Utah13.3¢$4.11
Vermont24.6¢$7.59
Virginia17.4¢$5.37
Washington14.4¢$4.44
West Virginia16.1¢$4.96
Wisconsin19.2¢$5.94
Wyoming14.7¢$4.54

Certified models closest in efficiency

computer monitors within reach of 31 kWh/yr
ModelkWh/yr$/yr (US avg)
Acer B247Ymost efficient31$5.82
EIZO FlexScan S193431$5.82
ViewSonic VS20870most efficient31$5.83
ASUS VA24DQFmost efficient31$5.80
DELL P2225Hbmost efficient31$5.84
DELL P2226Hbmost efficient31$5.78

Run your own numbers

Your rate, your numbers

Per day
2¢
Per month
$0.49
Per year
$5.84

31 kWh/yr × 18.8¢/kWh = $5.84/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 $0.48 a month at the U.S. average residential rate (18.8¢/kWh) — 2¢ a day, or $5.82 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 $3.82 a year in North Dakota (12.3¢/kWh) and $14 in Hawaii (46.6¢/kWh).

Keep digging