Monitor energy consumption statistics depend on how power is measured: on mode, sleep mode, or a certification-based annual total. ENERGY STAR’s current framework combines those states with screen area, resolution and defined allowances, while its Most Efficient 2025 listings provide model-level readings.
Key Monitor Energy Consumption Statistics
The most useful headline figures span certification assumptions, current listed models and historical program estimates:
- In the current ENERGY STAR monitor program statement, certified monitors are estimated to be 7% more energy efficient than standard options across the ENERGY STAR monitor program.
- Under the ENERGY STAR Version 8.0 specification, on mode represents 35% of the certification duty cycle for computer monitors.
- Under the same Version 8.0 specification, sleep mode represents 65% of the certification duty cycle for ENERGY STAR computer monitors.
- The Version 8.0 TEC calculation uses 8.76 as its hours-equivalent conversion factor when expressing weighted wattage as annual kWh for ENERGY STAR computer monitors.
- Version 8.0 reported TEC values are rounded to the nearest 0.1 kWh for ENERGY STAR computer monitors.
- The ViewSonic VS17551 is listed at 28.93 kWh per year in the Most Efficient 2025 ENERGY STAR results for a 23.8-inch IPS LCD monitor.
- The ASUS VU249H is listed at 29.04 kWh per year in the Most Efficient 2025 ENERGY STAR results for a 23.8-inch AAS-panel monitor.
- The Philips 27B2G5200 is listed at 29.33 kWh per year in the Most Efficient 2025 ENERGY STAR results for a 27-inch IPS LCD monitor.
- The ViewSonic VS17551 draws 8.86 W in on mode in the Most Efficient 2025 ENERGY STAR listing for its 23.8-inch IPS LCD display.
- The ASUS VU249H draws 9.21 W in on mode in the Most Efficient 2025 ENERGY STAR listing for its 23.8-inch AAS-panel display.
- The ViewSonic VS15560 draws 0.10 W in sleep mode in the Most Efficient 2025 ENERGY STAR listing for its 21.5-inch TN LCD display.
- The ASUS VU249H draws 0.14 W in sleep mode in the Most Efficient 2025 ENERGY STAR listing for its 23.8-inch AAS-panel display.
- For monitors with viewable area below 190 square inches, Version 8.0 sets a maximum-TEC formula using 4.00 kWh per megapixel, 0.172 kWh per square inch and a 1.50 kWh constant.
- For monitors with viewable area from 190 to below 210 square inches, Version 8.0 uses 4.00 kWh per megapixel, 0.020 kWh per square inch and a 30.40 kWh constant.
- The Version 8.0 automatic-brightness-control allowance is 5% of maximum TEC for qualifying ENERGY STAR computer monitors.
- The Version 8.0 full-network-connectivity allowance is 2.9 kWh for ENERGY STAR computer monitors.
- The Version 8.0 USB-C power-delivery allowance is 2.75 kWh for ENERGY STAR computer monitors.
- The Version 8.0 specification requires a monitor to enter sleep or off mode within 5 minutes after disconnection from a host computer under test and certification conditions.
- A 2014 EPA proposal estimated average ENERGY STAR certified-monitor power at 19 W in its historical proposal context.
- The same 2014 EPA proposal estimated 46% lower average energy use for ENERGY STAR certified monitors than conventional models in that historical comparison.
Contents
- What ENERGY STAR monitor energy statistics measure
- Annual monitor energy consumption data across certified models
- On-mode monitor power statistics by model
- Sleep-mode monitor energy consumption statistics
- How screen size and resolution shape monitor energy limits
- Monitor energy-saving allowances and power-management outcomes
What ENERGY STAR Monitor Energy Statistics Measure
ENERGY STAR Version 8.0 covers computer monitors and signage displays, including touch-screen products. The program identifies those categories within the display specification, but computer-monitor and signage-display results should not be treated as one interchangeable population; this scope statement comes from Monitors | ENERGY STAR.
The annual measure is TEC, or total energy consumption, calculated from weighted operating states rather than a household electricity-bill sample. Version 8.0 weights on mode at 35% and sleep mode at 65%, then multiplies the weighted wattage by 8.76 to express annual energy in kWh; reported TEC is rounded to the nearest 0.1 kWh, according to ENERGY STAR Program Requirements for Displays, Version 8.0.
These figures define a certification framework. They are not observed household-use averages, and the product records are not a random sample of all monitors sold.
ENERGY STAR says certified monitors are, on average, 7% more energy efficient than standard options across its monitor program. That program-level estimate is not a measurement of every monitor or of a whole-country fleet; see Monitors | ENERGY STAR.
Annual Monitor Energy Consumption Data Across Certified Models
The Most Efficient 2025 ENERGY STAR results provide a compact view of listed annual energy values. These are certification/listing measurements at stated test conditions, not universal use estimates.
| Model | Display description | Annual energy (kWh/year) |
|---|---|---|
| ViewSonic VS17551 | 23.8-inch IPS LCD | 28.93 |
| ASUS VU249H | 23.8-inch AAS panel | 29.04 |
| Philips 27B2G5200 | 27-inch IPS LCD | 29.33 |
| ViewSonic VS15560 | 21.5-inch TN LCD | 29.50 |
| ASUS VA24DQFS | 23.8-inch IPS LCD | 29.67 |
| ASUS PA248QV | 24.1-inch IPS LCD | 29.70 |
| ViewSonic VS20655 | 23.8-inch IPS LCD | 29.78 |
| Acer B247Y_v | 23.8-inch TFT LCD | 29.81 |
| ASUS VA249HG2 | 23.8-inch IPS LCD | 29.92 |
| ASUS VP229Q | 21.5-inch IPS LCD | 29.93 |
| Acer B277_v | 27-inch TFT LCD | 30.07 |
| ASUS VP229 | 21.5-inch IPS LCD | 30.24 |
| ASUS VA24D | 23.8-inch IPS LCD | 30.30 |
| Acer V227Q | 21.5-inch IPS LCD | 30.41 |
| Acer B277U_v | 27-inch TFT LCD | 30.42 |
| LG 24BA450 | 23.8-inch IPS LCD | 30.50 |
| ASUS VY249HG3 | 23.8-inch TFT LCD | 30.54 |
| Dell P2226Hb | 21.5-inch IPS LCD | 30.70 |
| Dell E2226Ht | 21.5-inch IPS LCD | 30.76 |
| Samsung S24HG320EN | 23.8-inch IPS LCD | 30.76 |
Source: ENERGY STAR Certified Displays — Most Efficient 2025 results. The listed annual values use the program’s stated test framework and retain each model’s size and panel label.
The set includes 21.5-inch, 23.8-inch, 24.1-inch and 27-inch products, with IPS, AAS, TN and TFT LCD descriptions. Those labels make the records useful for like-for-like inspection, but they do not establish a market-wide average or isolate the effect of one specification.
On-Mode Monitor Power Statistics by Model
On-mode readings show the listed draw while the display is operating under the test condition. Actual draw can vary with brightness, image content and settings, so these values should remain attached to the ENERGY STAR listing context.
| Model | Display description | On mode (W) |
|---|---|---|
| ViewSonic VS17551 | 23.8-inch IPS LCD | 8.86 |
| ASUS VU249H | 23.8-inch AAS panel | 9.21 |
| Philips 27B2G5200 | 27-inch IPS LCD | 9.25 |
| ViewSonic VS20655 | 23.8-inch IPS LCD | 9.25 |
| ViewSonic VS15560 | 21.5-inch TN LCD | 9.40 |
| ASUS VA24DQFS | 23.8-inch IPS LCD | 9.40 |
| ASUS PA248QV | 24.1-inch IPS LCD | 9.40 |
| Acer B247Y_v | 23.8-inch TFT LCD | 9.48 |
| ASUS VA249HG2 | 23.8-inch IPS LCD | 9.50 |
| ASUS VP229Q | 21.5-inch IPS LCD | 9.52 |
| Acer B277_v | 27-inch TFT LCD | 9.57 |
Source: ENERGY STAR Certified Displays — Most Efficient 2025 results.
The listed on-mode values in this group run from 8.86 W for the ViewSonic VS17551 to 9.57 W for the Acer B277_v. Because these are model records under listed test conditions, the range should not be generalized to every monitor size, panel type or usage pattern.
Sleep-Mode Monitor Energy Consumption Statistics
Sleep mode receives the larger 65% weighting in the Version 8.0 TEC duty cycle, making low standby draw important to the certification calculation. The product records below show how small the listed sleep-mode readings are for the same Most Efficient 2025 group.
| Model | Display description | Sleep mode (W) |
|---|---|---|
| ViewSonic VS17551 | 23.8-inch IPS LCD | 0.31 |
| ASUS VU249H | 23.8-inch AAS panel | 0.14 |
| Philips 27B2G5200 | 27-inch IPS LCD | 0.17 |
| ViewSonic VS15560 | 21.5-inch TN LCD | 0.10 |
| ASUS VA24DQFS | 23.8-inch IPS LCD | 0.15 |
| ASUS PA248QV | 24.1-inch IPS LCD | 0.20 |
| ViewSonic VS20655 | 23.8-inch IPS LCD | 0.25 |
| Acer B247Y_v | 23.8-inch TFT LCD | 0.13 |
| ASUS VA249HG2 | 23.8-inch IPS LCD | 0.14 |
| ASUS VP229Q | 21.5-inch IPS LCD | 0.13 |
| Acer B277_v | 27-inch TFT LCD | 0.13 |
Source: ENERGY STAR Certified Displays — Most Efficient 2025 results.
In the historical 2014 EPA proposal, most monitor products consumed less than 0.5 W in sleep mode. “Most” was a qualitative observation rather than a reported percentage, and the proposal should not be treated as a current market-wide measurement; see Proposed Total Energy Consumption (TEC) Approach for ENERGY STAR Version 7.0 Monitors.
How Screen Size and Resolution Shape Monitor Energy Limits
Version 8.0 sets maximum TEC equations using megapixels and viewable area. These are certification limits, not measured fleet consumption, and the coefficients change across four screen-area bands.
| Viewable area | Maximum-TEC formula components |
|---|---|
| Below 190 sq. in. | 4.00 kWh per megapixel + 0.172 kWh per sq. in. + 1.50 kWh |
| 190 to below 210 sq. in. | 4.00 kWh per megapixel + 0.020 kWh per sq. in. + 30.40 kWh |
| 210 to below 315 sq. in. | 4.00 kWh per megapixel + 0.091 kWh per sq. in. + 15.40 kWh |
| 315 sq. in. or more | 4.00 kWh per megapixel + 0.182 kWh per sq. in. − 13.20 kWh |
Source: ENERGY STAR Program Requirements for Displays, Version 8.0.
The formula structure means screen area and resolution enter the limit together rather than acting as a single simple size rule. A 27-inch label alone therefore does not determine annual consumption, and the listed product records should be read with their panel and test details.
Monitor Energy-Saving Allowances and Power-Management Outcomes
Version 8.0 includes allowances for qualifying features. These values expand a certification calculation; they are not measured savings from every installation.
- Automatic brightness control receives an allowance of 5% of maximum TEC.
- Full network connectivity receives an allowance of 2.9 kWh.
- USB-C power delivery receives an allowance of 2.75 kWh.
- A qualifying curved-display feature receives an allowance of 15% of maximum TEC.
- DisplayHDR 600 receives an HDR allowance of 5% of maximum TEC.
- DisplayHDR 1000 receives an HDR allowance of 10% of maximum TEC.
The allowances are specified in Displays Key Product Criteria | ENERGY STAR. Their presence should not be converted into a claim that every feature lowers electricity use by the allowance amount.
The same Version 8.0 specification requires monitors to enter sleep or off mode within 5 minutes after disconnection from a host computer under test and certification conditions. Real-world settings may differ, so this is a power-management requirement rather than a measured outcome for every installation; see ENERGY STAR Program Requirements for Displays, Version 8.0.
For historical context only, the 2014 EPA proposal reported average ENERGY STAR certified-monitor power at 19 W and estimated a 46% lower average energy use than conventional models in its proposal dataset. Those figures belong to that 2014 proposal context, with its conventional-model baseline and testing framework, and should not be presented as current all-monitor averages; see Proposed Total Energy Consumption (TEC) Approach for ENERGY STAR Version 7.0 Monitors.