Worcester, MA – June 20, 2011 – World Energy Solutions, Inc. (NASDAQ: XWES), a leading energy management services firm, today announced it has successfully supported the 12th quarterly auction of carbon dioxide (CO₂) allowances administered by Regional Greenhouse Gas Initiative, Inc. (RGGI, Inc.) on June 8, 2011.

According to RGGI, Inc., auctions for the current and future compliance periods yielded over $25.5 million to promote clean energy sources and lower energy costs for consumers across the region. Full details of the auction results can be found in the RGGI, Inc. press release dated June 10, 2011 and on www.rggi.org.

About World Energy Solutions, Inc.

World Energy Solutions, Inc. (NASDAQ: XWES) is an energy management services firm that brings together the passion, processes and technologies to take the complexity out of energy management and turn it into bottom-line impact for the businesses, institutions and governments we serve. To date, the Company has transacted more than $20 billion in energy, demand response and environmental commodities on behalf of its customers, creating more than $1 billion in value for them. World Energy is also a leader in the global carbon market, where its World Green Exchange® supports the ground-breaking Regional Greenhouse Gas Initiative’s (RGGI) cap and trade program for CO₂ emissions. For more information, please visit www.worldenergy.com.

This press release contains forward-looking statements that are subject to risks and uncertainties that could cause actual results to differ from those indicated in the forward-looking statements. Such risks and uncertainties include, but are not limited to the following: our revenue and backlog are dependent on actual future energy purchases pursuant to completed procurements; the demand for our services is affected by changes in regulated prices or cyclicality or volatility in competitive market prices for energy; and there are factors outside our control that affect transaction volume in the electricity market. Additional risk factors are identified in our Annual Report on Form 10-K and subsequent reports filed with the Securities and Exchange Commission.

SOURCE: World Energy Solutions, Inc.