Energy costs are heating up again as an issue for greenhouse operators in the U.S. With the gradual increase in the cost of traditional fossil fuel, it's a good time to look at alternative energy sources. Geothermal is a proven, environmentally benign alternative energy source for greenhouse production. Low operating costs from shallow geothermal reservoirs can result in substantial energy cost savings compared to traditional fossil fuels. A number of commercial greenhouses, both large and small, are already taking advantage of geothermal heat in the southwest to reduce their energy costs and increase their profitability