![]() ![]() The ability to store energy for weeks at the lowest levelized cost of long duration storage in the industry, and providing what is called “grid-synchronous inertia,” balances electrical demand and supply and helps avoid blackouts. The Highview-Encore installation would help solve some of those issues. "Such a trade-off, whereby a new, more expensive generator displaces already existing - and less expensive - renewable energy, would harm Vermont utilities and customers," the PUC said. The PUC said this could happen with the Derby installation. "When that occurs, the regional grid operator requires certain generators, typically with a capacity of 5 MW or larger, to curtail (reduce) their electrical output to ensure reliable operation of the transmission system." "Curtailment arises when the transmission lines in a particular area are at risk of being overloaded," the PUC said. It would also go against, the PUC said, the comprehensive energy plan the DPS adopted in 2016. The order also said that the Vermont Department of Public Service, Vermont Electric Cooperative Inc and Green Mountain Power had agreed that the project would require the reduction (curtailment) of existing renewable sources at the expense of customers. "Further, the capacity of the electrical transmission lines leading out of the area is not sufficient to transport the excess power without jeopardizing the reliable operation of the electrical grid." "In this largely rural area, output from existing renewable energy plants often exceeds electric demand," the PUC said. The Vermont Public Utilities Commission rejected in January 2019 a large solar project in Derby (500KW alternating-current solar net-metering system because the developer failed to show it was in "the public good of the state") because of the limitations of the grid and the possible reduction of other, cheaper renewable energy sources. ![]() A VELCO-owned 115kV transmission line from Sheffield to Highgate to St Albans and a GMP owned 34.5kV subtransmission line from VELCO East Fairfax to Lowell make up the region. The SHEI (Sheffield Highgate Export Interface) is an ISONE defined transmission region in northern Vermont. In addition to supplying clean, reliable, and cost-efficient energy storage, the facility to be developed by Highview Power and Encore will provide valuable services to the area’s transmission system to help integrate renewable energy, stabilize the regional electrical grid, and ensure future energy security during storms and other disruptions. The Vermont facility will contribute to resolving the longstanding energy transmission challenges surrounding the state’s Sheffield-Highgate Export Interface (SHEI) and enable the efficient transport of excess power from renewable energy sources, such as solar and wind power to help integrate them on the power grid. The project is the first of many utility-scale, liquid air energy storage projects that Highview Power plans to develop across the United States to help scale up renewable energy deployment. ![]()
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