Annual Energy Production Calculator
A wind turbine's nameplate rating tells you its maximum output under ideal conditions, but the energy it actually delivers over a year depends on how often the wind blows hard enough to approach that maximum. That real-world delivery is captured by the capacity factor — the share of theoretical maximum output the turbine achieves across 8,760 hours. This calculator multiplies rated power, annual hours, and capacity factor to estimate annual energy production in MWh/year. Start here to size a single turbine, then scale up to a full wind farm. Pair the result with our Wind Turbine Output Calculator for instantaneous power estimates, and our Capacity Factor vs. Hub Height Calculator to see how raising hub height lifts the capacity factor that drives this number.
Typical modern onshore wind turbines are rated 2-4 MW (2,000-4,000 kW).
The U.S. wind fleet averaged 33.5% in 2023 and an all-time high of 35.9% in 2022 (EIA data). Strong wind sites and modern turbines can exceed 40-45%.
(turbine rated power (kW) × 8,760 × (capacity factor (%) ÷ 100)) ÷ 1,000
Results update live as you type. For planning and field-check estimates — always verify against applicable standards and equipment ratings.
How we calculate this →A single 2.5 MW turbine operating at a 35% capacity factor -- roughly in line with the U.S. wind fleet average -- produces about 7,665 MWh a year, enough to power over 700 average U.S. homes at roughly 10,800 kWh/year each. Scale that turbine into a 100-turbine wind farm and you're looking at over 766,000 MWh annually -- illustrating why capacity factor, not just nameplate rating, ultimately determines a wind project's real energy output and revenue potential.
How annual energy production is calculated
This calculator estimates the annual energy production (AEP) of a wind turbine from two inputs: the turbine's rated power and its expected capacity factor. One quantity ties the calculation together.
Annual Energy Production (MWh/year) = (Turbine Rated Power (kW) × 8,760 × (Expected Capacity Factor (%) ÷ 100)) ÷ 1,000. Rated power is the maximum electrical output the turbine produces at its design wind speed, expressed in kilowatts (a 2.5 MW turbine is 2,500 kW). Multiplying by 8,760 gives the theoretical maximum energy if the turbine ran at full rated power every hour of the year. The capacity factor converts that theoretical maximum into real annual production: it is the percentage of the nameplate output the turbine actually delivers, given that the wind is not always blowing at or above the design speed. Dividing by 1,000 converts kilowatt-hours to megawatt-hours. At the defaults (2,500 kW, 35% capacity factor), that is (2,500 × 8,760 × 0.35) ÷ 1,000 = 7,665,000 ÷ 1,000 = 7,665 MWh/year.
Two notes on the model. First, capacity factor is the single most important and most uncertain input -- the U.S. wind fleet averaged 33.5% in 2023 and an all-time high of 35.9% in 2022 (EIA data), but individual projects range considerably based on site wind resource, turbine technology, and hub height; strong sites with modern turbines can exceed 40-45%. Second, this is an annual energy planning estimate that does not model hourly output, wake losses from neighboring turbines, turbine availability/downtime, or curtailment -- for project financing, validate against a full site-specific wind resource assessment. Data sources: U.S. wind fleet capacity factor data from EIA (Energy Information Administration) annual reports and wind power generation statistics; turbine nameplate ratings from manufacturer specifications; annual energy production methodology from NREL wind resource assessment standards and IEC 61400 wind turbine design standards; wind farm performance data from utility-scale wind project monitoring and case studies. Verification: with defaults (2,500 kW, 35% capacity factor), Annual Energy Production = 7,665 MWh/year.