Alternative energy systems are now more affordable than ever, with the help of expanded federal tax incentives and state rebates. Once a solar, wind, or geothermal system is installed, it provides energy at no cost for as long as it lasts, generally 25 years or more. And biomass systems use renewable, domestically produced, carbon-neutral fuels. Nelson & Small offers a full assortment of products that generate heat, cooling, hot water, and electricity using little or no fossil fuel. We also offer complete engineering, design, and specification services for any size installation.