2009 Scenario Reliability Assessment - NERC

Scenario Reliability Self-AssessmentsTable New England 4-2 – Significant Transformer Additions within the 2009Scenario CaseTransformer ProjectDescription/StatusNameNEEWS (GreaterSpringfieldReliability Project)NEEWS (GreaterSpringfieldReliability Project)High-SideVoltage(kV)LowSideVoltage(kV)In-ServiceDate(s)345 115 Dec-2013345 115 Dec-2013Ludlow Substation – Replace twoautotransformers.North Bloomfield Substation - Installsecond autotransformer.There are no differences between the Reference Case and the Scenario Case with respect to newsignificant substation equipment. Within the Scenario Case, to rapidly integrate the largeamounts of renewable resources into New England’s power system, it is assumed that both localand bulk transmission substation equipment and other special devices would need to be addedand/or modified to support such new, renewable infrastructure enhancements.As a notable exception to the transmission statements above, there currently exists several bulktransmission interfaces on the New England system, which are currently impacted by thermal,stability, and voltage limitations. These transmission interfaces limit the free flow of poweracross the system. Assuming the mandate of an accelerated integration of renewable resources asmandated within the Scenario #1 requirement, it would be a safe assumption for New Englandthat a majority of these new renewable resources that would be expected to be commercializedand operating during the target assessment year 2018, and thus would require some build-out ofthe exiting transmission system within the Region to accommodate the influx of 4,654 MW ofnew renewable capacity. Depending on where these projects are physically located and thus“electrically-located,” they may either be on the “right-side” or “wrong-side” of an existingtransmission interface, thus either helping to dampen the constraining effects of the transmissioninterface or exacerbating it. Aside from the standard supply-side resource interconnectionprocess for which either a minimum transmission interconnection standard or a maximum 60(output) transmission interconnection standard could be applied, some amount of additionaltransmission expansion would definitely be required to ensure the unconstrained delivery of thisnew renewable power throughout the existing ISO-NE system.60 Currently referred to within the Forward Capacity Market as the Capacity Capability Interconnection Standard(CCIS).2009 Scenario Reliability Assessment Page 81