As applications for the 2010 Inc. 500 | 5000 arrive, we thought it would be worthwhile to shine a spotlight on some of the companies that are vying to appear on our ranking of the fastest-growing private companies in the U.S. (For more information and to apply, go to One that caught our eye was Southampton, New York-based GreenLogic Energy.

Founded in 2005, GreenLogic works with homes, businesses and municipalities from New York City to the tip of Long Island to install and maintain the best alternative energy solutions. According to GreenLogic co-founder and managing director Marc Cléjan, his company works to eliminate both the financial and environmental burdens of typical power sources.

'We refer to ourselves as technology integrators,' Cléjan says. 'We don't build anything, but we search out the best products in the market and bring them to our clients.'

The GreenLogic team uses several types of technologies to eliminate environmental impact, including solar photovoltaic (VP) and solar thermal systems, wind turbines, and geothermal heating and cooling. 'By putting these technologies together, we can supply 100 percent of energy needs, [including] electric, heating, cooling, cooking, and in the near future, even transportation,' Cléjan explains.

From 2007 through 2009, GreenLogic grew from having only 100 clients to 486, growth of 386 percent. He attributes the company's increase in clients to a comprehensive marketing and sales approach, coupled with a superior network of referrals, which currently accounts for about 60 percent of their business.

GreenLogic's product systems also have 25-year warrantees, and drastically cut down not only the financial aspect of energy, but on carbon dioxide emissions, too. As a result of installing these combined technologies, Cléjan says that 25 percent of his company's nearly 450 clients have no energy costs whatsoever.

'When you take the full value of everything, it adds up to $50 million savings for customers, financially,' Cléjan says. 'On environmental costs, the equivalence of carbon dioxide reduction would be if we went out and planted 1,000 acres of trees. Customers are signing up because this makes sense.'