Global clean-energy markets are poised to quadruple in the next decade, growing from $55.4 bln in revenues in 2006 to more than $226.5 bln by 2016 for four benchmark technologies, according to Clean Edge. For the second year in a row, the global biofuels market was slightly larger than both solar and wind, reaching $20.5 bln in 2006 and projected to grow to more than $80 bln by 2016. Clean Edge projects solar photovoltaics (modules, system components, and installations) will grow from a $15.6 bln market in 2006 to $69.3 bln by 2016; wind power installations will expand from $17.9 bln in 2006 to $60.8 bln in 2016; and the markets for fuel cells and distributed hydrogen will grow from $1.4 bln in 2006 to $15.6 bln over the next decade.