Evolution of the U.S. energy service company industry: Market size and project performance from 1990-2008

► U.S. ESCO industry revenues were ∼$4 billion in 2008 and we estimated accelerated growth for 2011. ► U.S. ESCOs generated ∼$23 billion in direct benefits at projects installed from 1990-2008. ► Industry evolution has implications for customer project economics, especially at K-12 schools. ► Payback times have increased from 1.9 to 3.2 years in private sector projects since 1990. ► Payback times have increased from 5.2 to 10.5 years in public sector projects since 1990.