A 1MW solar farm produces about 1,825MWh of electricity per year, enough to power approximately 170 U. The exact amount of energy a solar farm produces depends on many factors, such as the solar farm's capacity, the amount of sunlight it receives, weather conditions, grid health, and many. How much electricity does a 1MW solar power plant generate monthly? Understand factors affecting output, average yields. How much energy (megawatt hours / MWh) comes from 1 megawatt (MW) of solar power? The answer varies tremendously based on the geographic location and the amount of sunshine but a US national average can be calculated by using capacity factor data from the US Energy Information Administration (EIA). Annual electricity generation (kWh) = Installed capacity (kW) × Peak sunshine hours (h) × System efficiency 1000 kW × 1600 h × 0. 8 = 1,280,000 kWh Actual output may reach 1. To put this into perspective, a typical residential solar panel system is around 5-10 kilowatts (kW), so a 1 MW solar farm is equivalent to about 100-200 residential systems. The biggest the rated wattage of a solar panel, the more kWh.