Concord Gas Light Company Gasholder House

The Concord Gas Light Company Gasholder House is a historic gasholder house at Gas Street in Concord, New Hampshire. Built in 1888, it is believed to be the only such structure in the United States in which the enclosed gas containment unit is essentially intact. It was listed on the National Register of Historic Places in 2018. As of 2018 it is owned by Liberty Utilities, a regional natural gas company, and its future is uncertain.

Description and history
The Concord Gas Light Company Gasholder House is located south of downtown Concord, on the east side of South Main Street just south of its junction with Water Street and north of its junction with Gas Street. It is a circular brick building  in diameter, which is capped by a funnel-shaped roof that has a cupola at the center. The total building height is . Architecturally, the wall is divided into sixteen sections, articulated by simple brick piers, with a tall and narrow round-headed window in most of these sections. A south-facing bay has a projecting hip-roofed valve house, which historically served as the source feed for the storage facility, while a west-facing bay has a projecting gable-roofed valve house which housed the interconnection to the city mains.

Inside the brick structure is a concrete storage tank with a capacity of . It has a floor  thick, with walls that taper from  at the base to  at the top. It is reinforced by wrought iron bands. The gasholder (which functions as a sort of lid on the tank) is  in diameter, and is constructed out of metal plates riveted together. It was guided in its movements by rails mounted on the inside of the concrete tank.

The Concord Gas Light Company was founded in 1852, establishing a plant for manufacturing lighting gas from coal on South Main Street. As the company expanded service, it built smaller gasholders, both near its manufacturing sites, and at remote service areas. By the 1880s, it had four such gasholders with a total capacity of , which was deemed inadequate for its needs. The present building was constructed in 1888 as a long-term solution to its capacity problem. It remained in service as a gasholder until 1921, when the company built a more modern steel structure with even more capacity (it was demolished in 1989). The company discontinued use of gasholders in 1952, when it was connected to nationwide gas pipeline networks.

According to research performed as part of a federal HAER survey of the building, it is believed to be the only gasholder building of its type with an intact interior tank.

See also
National Register of Historic Places listings in Merrimack County, New Hampshire

References

Category:Industrial buildings and structures on the National Register of Historic Places in New Hampshire
Category:Buildings and structures completed in 1888
Category:Buildings and structures in Concord, New Hampshire
Category:National Register of Historic Places in Concord, New Hampshire
Category:Gas holders