Significant seasonal demand spikes affect a number of areas around the country. Addressing them in a cost effective manner is a priority for those utilities that face large differentials between summer and winter loads.
One of those places, Nantucket, is both an isolated island and a wealthy summer colony whose population swells in the warmest months. It is a growing load area served by National Grid, and to meet that new demand, an expensive new transmission line could be required in the future. With the island’s backup generation aging, it leaves residents and the tourism industry in a precarious spot, should anything go wrong.
In an increasingly prevalent move, the island is turning to energy storage for a solution that illustrates how scalable battery systems can be. But while National Grid plans to avoid a costly transmission upgrade, its storage-based solution won’t be in place until 2019, leaving Nantucket’s residents and businesses vulnerable to potential outages as demand rises this summer.
In some respects, Massachusetts’ Nantucket Island is similar to North Carolina’s Ocracoke — highly seasonal, powered by undersea transmission cables, with some backup generation in place.
Ocracoke lessons
Last summer, Ocracoke Island experienced a week-long partial outage when one of those undersea cables was cut. Tourists had to evacuate and island businesses lost a significant chunk of their seasonal revenues. A microgrid developed on the island managed to keep some power on for residents, but unfortunately its diesel backup generation failed as well.
Nantucket is looking to avoid a similar disaster, and has employed a larger, yet similar approach to resiliency. Each island is looking to diesel backup and energy storage from Tesla, along with demand management, to ensure they can meet summer peak demand.
Ocracoke Island has about 1,000 full-time residents, and so its system is much smaller, including a 3 MW diesel generator, 500 kW/1 MWh Tesla battery and 15 kW of solar.
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