If an extended power outage were to occur in winter, the heat pump systems would be taken off line, and the stand-by diesel generator and the stand-by oil boiler would be fired until grid power was restored.  This is very rare occurrence as the City of Seward has its own standby generation.  The most likely method of preventing the use of standby diesel generators in Seward is to install a number of small hydro plants that in total can carry the load of the town.  Wind, tidal, and solar could add to this.