For decades, gas-insulated substations (GIS) have been used primarily in densely populated metropolitan areas. They take up only 10% of the footprint of outdoor or air-insulated substations and provide reliable medium- and low-voltage service where space needed to service areas for industrial locations, hospitals, and housing may be limited. However, as rural environments become desirable for solar and wind development, GIS is proving to be an attractive solution outside of urban environments for its reliability, reduced maintenance, and smaller environmental impact.
