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Constellation Energy Projects & Services Group was founded in 1983 as Baltimore Biogas to serve the natural gas needs of large commercial and industrial customers in the Baltimore Gas & Electric (BG&E) service area.

In 1994, the company changed its name to Baltimore Natural Gas (BNG) and began geographically expanding retail gas commodity operations.

Also in 1994, a separate group – BG&E Energy Projects & Services – was formed to focus on integrated project contracting, specializing in energy services and power quality solutions for the commercial, industrial and governmental markets. The formation of this subsidiary enabled BGE to streamline expertise and talent to more clearly focus on the growing demands of these market segments.

In 1997, BNG changed its name to Constellation Energy Source

In 1998, BG&E Energy Projects & Services was merged into Constellation Energy Source.

In 2004, Constellation Energy Source changed its name to Constellation Energy Projects & Services Group (CEPS) to more accurately reflect the current business model.

CEPS has continued to grow its energy services business by acquiring Cogenex (an energy service efficiency company founded in 1983 as Citizens Heat and Power Corp.), Energy Performance Services (a Philadelphia based energy services company founded in 1986) as well as Water & Energy Savings Company (a Florida-based water and energy savings company with expertise in public housing authorities).

These acquisitions, in 2005 and 2008 respectively, have greatly expanded CEPS’s geographic and technical capabilities in the energy consulting, performance contracting, on-site energy assets and renewable energy markets. CEPS remains a wholly-owned subsidiary of Constellation Energy (NYSE: CEG).