Solar farming can be profitable, with average returns of 10-15% annually. Initial setup costs range from $800 to $1,200 per kW of capacity while operating costs are typically low. Revenue depends on local energy prices and solar irradiance levels. Some people lease their land as a solar farm, as an alternative to selling or farming, because it can provide consistent income for up to 50 years. But the central question for any investor remains: How profitable is it, really? This comprehensive guide breaks down the numbers, key profitability. Solar Farms are large installations of solar panels that are ground-mounted at an angle in order to harness solar energy.