Constellation Energy, a Maryland-based company with operations in California, and Exelon, an Illinois-based company, are set to become one--under the name Exelon. The companies announced the plan April 28. Constellation owns biomass and solar facilities in California. It sold its geothermal plant to Ormat in 2010. Constellation posted a loss of $982 million in 2010. In 2009, it reported income of $4.44 billion. In 2010, Exelon posted income of $2.5 billion. What the companies have in common is nuclear power. Exelon is the largest nuclear owner in the U.S. It has 10 facilities in Illinois, Pennsylvania, and New Jersey. Constellation owns nuclear plants, including Calvert Cliffs, Ginna, and Nine Mile Point. Its nuclear operations are part of a joint venture with France\u2019s EDF. In their statement on the merger, the companies refer to their nuclear and other energy investments as \u201cenvironmentally advantaged.\u201d The nuclear and traditional energy part of the new company is set to be based in Chicago, IL. Their renewable energy businesses are to be headquartered in Baltimore, MD. Stockholders, the Federal Energy Regulatory Commission, Nuclear Regulatory Commission, and state public utilities\u2019 commissions have to approve the merger. The companies anticipate closing in early 2012.