Direct answer: The number of homes powered by 1 MW depends on whether you mean instantaneous capacity or energy delivered over time. Here is the math using average household consumption, and why the answer changes with source type and time of day.
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How Many Homes Can 1 MW Power?
There is no single answer because 1 MW can mean capacity (power available at one instant) or energy (power delivered over time). A common rule of thumb for the US is that 1 MW of capacity can serve roughly 700 to 900 average homes, but the real number depends on average household consumption, the capacity factor of the source, and when the power is needed.
Start with average household energy
The US Energy Information Administration reports average annual residential electricity consumption. In recent years that average has been around 10,500 kWh per home per year, which works out to about 1.2 kW of average continuous demand per home (10,500 kWh divided by 8,760 hours in a year). Divide 1,000 kW (1 MW) by that average and you get roughly 800 homes as a first-pass estimate.
That estimate is a simplification. Household demand varies by season, climate, home size, heating and cooling type, and time of day. A summer evening with heavy air-conditioning use can draw several times the average, while overnight demand is far lower.
Capacity factor changes the answer for renewables
A megawatt of solar or wind capacity does not produce 1 MW all day. Solar panels generate close to their rating only during peak sun hours, while a dispatchable plant can run more steadily. So a 1 MW solar array and a 1 MW gas plant power different numbers of homes over a year. Use a location-based model such as NREL's PVWatts calculator to estimate annual energy production for a specific site.
Worked example
- Assume 10,500 kWh per home per year (about 28.8 kWh per day).
- A 1 MW source operating 24 hours a day at full output produces 24,000 kWh per day (1,000 kW times 24 hours).
- Divide 24,000 by 28.8 and you get roughly 830 homes per day under those idealized conditions.
- Reduce output for a solar array that only produces near its peak for a few hours a day, and the daily number drops accordingly.
These are planning estimates, not guarantees. For EIA data, start with the EIA's residential electricity consumption information and verify the current figures.
Why this matters when buying backup power
Understanding the difference between capacity and energy is exactly what prevents people from buying the wrong power station. A home battery's kilowatt-hour rating is stored energy; its inverter rating is the power it can deliver at one moment. If your goal is outage backup for essential circuits, use the power station sizing calculator to size storage around your measured loads, then compare current models in the price comparison chart.
FAQ
How many homes can 1 megawatt power?
As a rough US estimate, about 700 to 900 average homes, using roughly 10,500 kWh of annual consumption per home. The exact number depends on household demand, the source's capacity factor, and time of day.
How many homes can 1 MW of solar power?
Fewer than a continuously available megawatt, because solar only produces near its rating during peak sun hours. Estimate the site's annual production with NREL's PVWatts calculator, then divide by average household consumption.
What is the difference between a megawatt and a megawatt-hour?
A megawatt (MW) is instantaneous power; a megawatt-hour (MWh) is energy delivered over one hour at one MW. Homes consume energy over time, so both the power rating and the duration matter.