As of 2026, the average cost of residential solar panels in the U. is between $15,000 and $25,000 before incentives. This typically translates to about $2. 50 per watt of installed capacity (more on price per watt below). Data source: IRENA (2025); Nemet (2009); Farmer and Lafond (2016) – Learn more about this data Note: Costs are expressed in constant 2024 US$ per watt. Global estimates are used before 2010; European market. Investing in a 1-megawatt (MW) solar power plant is a significant decision that combines environmental impact with substantial financial planning. For commercial entities, independent power producers, and communities, understanding the real cost structure and profit potential in 2025 is crucial. Switch to solar with a system built for you. But here's the kicker: The actual price isn't as straightforward as reading numbers off a menu. This high-power, low cost solar energy system generates one mega-watt or 1,000,640 watts (1 mW) of grid-tied electricity with (1,696) 590 watt Axitec XXL bi-facial model PS590M8GF-24/TNH, SMA Sunny High-power three-phase inverter (s), DC string combiners,.