A new analysis released by Frost & Sullivan, "North American Renewable Energy Market: Investment Analysis & Growth Opportunities," reveals that revenues in the U.S. and Canadian renewable emergy markets totaled $17.37 billion in 2006, and are likely to reach $24.6 billion in 2010.

"Raw materials supply constraints are being noted in the solar energy segment, where the manufacturers face a shortage of silicon... The growth of the wind turbines sector could also be impacted by the short-term price increases caused by the high steel costs and shifting currency valuations." -- Saranya Sundaram, Research Analyst, Frost & Sullivan