NB Power
Similar to Maritime Electric, Summerside Electric purchases the majority of its electricity from NB Power. In 2008, 76.5% of its power was acquired from NB Power. Although the Summerside Electric Commission has its own diesel engines at the Harvard Street Generating Station which can operate for several days independently of NB Power's supply, it is only used in exceptional circumstances such as when the NB Power or Maritime Electric transmission grids that feed the city are interrupted. They also run their engines on the last day of every month, for maintenance reasons and they sell that power back to NB Power.