The acquisition will help NRG expand its retail customer base in the Northeast US as more than 90% of Energy Plus customers reside in states such as Pennsylvania, New York, Connecticut, New Jersey, Maryland and Illinois.

NRG president and CEO David Crane said the purchase of Energy Plus will add a highly effective and essentially non-replicable sales chain to NRG’s retail energy platform.

The transaction, which is expected to close in October 2011, is subject to regulatory approvals, including from the Federal Energy Regulatory Commission and the US Department of Justice as well as other regulatory notices.