A 1 MW solar farm is a photovoltaic power station that has a capacity to produce 1 megawatt of electricity. This means that a 1 MW solar farm can power around 1,000. The AES Lawai Solar Project in Kauai, Hawaii has a 100 megawatt-hour battery energy storage system paired with a solar photovoltaic system. Sometimes two is better than one. Coupling solar energy and storage technologies is one such case. Whether sizing a solar farm, designing a microgrid, or deploying a commercial & industrial (C&I) energy storage system, understanding. In power systems, megawatts (MW) measure instantaneous power - the rate at which energy is being generated, transmitted, or consumed at any moment. When measuring energy delivered or consumed over a period of time, we use megawatt-hours (MWh).