Lacey Township is a township in Ocean County, New Jersey and is considered part of the Jersey Shore region. As of the 2010 United States Census, the township's population was 27,644, reflecting an increase of 2,298 (+9.1%) from the 25,346 counted in the 2000 Census, which had in turn increased by 3,205 (+14.5%) from the 22,141 counted in the 1990 Census. The 2010 population was the highest recorded in any decennial census. It was named for Continental Army General John Lacey.
Lacey Township was incorporated as a township by an Act of the New Jersey Legislature on March 23, 1871, from portions of Dover Township (now known as Toms River Township) and Union Township (now Barnegat Township). Portions of the township were taken on June 23, 1933, to form the borough of Island Beach (which is now Island Beach State Park, part of Berkeley Township).
The Oyster Creek Nuclear Generating Station is located in the southern part of the township. The single-unit 636 MWe boiling water reactor power plant adjoins the Oyster Creek and is owned and operated by Exelon Corporation. It produces 9% of the state's electricity and is the nation's oldest operating nuclear power plant, having first been brought online on December 1, 1969, and is licensed to operate until April 9, 2029. In 2010, Exelon announced that it would close the facility in 2019 as part of an agreement with the State of New Jersey under which the plant would be allowed to operate without cooling towers.