Deepwater Wind - Energy Highway

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! VI. Interconnection ! Deepwater has developed a comprehensive interconnection plan that is based on a front end engineering design (FEED) study that it commissioned from SGC Engineering. The interconnection plan will be finalized through detailed engineering and design work in consultation with LIPA, NYISO, and ISO-NE. Shoreham 138 kV Power from the Wind Plant, as well as exports from ISO-NE, will be delivered to LIPA at the existing 138 kV substation at the Shoreham former nuclear power plant site. Deepwater commissioned Siemens PTI to prepare a preliminary interconnection feasibility assessment. This study found that there were few upgrades necessary on LIPA’s bulk transmission system needed to support the injection of power from Deepwater’s Project. Deepwater has also evaluated the Port Jefferson, Riverhead, and Buell substations as alternative points of interconnection in Zone K. Interconnecting at Shoreham increases the efficiency of the LIPA transmission system by supplying the under-served eastern load pocket and by more fully utilizing the transmission infrastructure that is currently in place. Brayton Point 345 kV In New England, the Project will interconnect at the Brayton Point 345 kV substation. During periods of low wind energy production, power may be exported from the Brayton Point interconnection to balance the output of the Wind Plant. During periods of high wind energy production, when the Wind Plant’s output exceeds 600 MW the excess power that cannot be delivered to LIPA will be diverted to ISO-NE and injected at Brayton Point. Accordingly, the Brayton Point interconnection has been designed for both injections and withdrawals. Siemens PTI has confirmed that the high-voltage 345 kV system at Brayton Point is able to accept both injections and withdrawals. As an alternative to Brayton Point, Deepwater is also evaluating National Grid’s Kent County 345 kV substation. Offshore HVDC The Wind Plant will be connected to an HVDC transmission system at the offshore converter station, delivering power to the AC bus before conversion to DC power. Deliverability and Interconnection Service Deepwater has commissioned a series of studies which suggest that the proposed 600 MW can be delivered to the Shoreham 138 kV substation. Specifically, a FEED study performed by SGC Engineering established the optimal project configuration from the perspective of cost and functionality. In addition, Deepwater had Siemens PTI prepare a ! 19
! ! preliminary interconnection feasibility assessment. This study showed that a system redispatch would solve any post-contingency overloads in the 138kv circuits created by the interconnection of the Project. Deepwater also commissioned Siemens PTI to prepare an interface analysis, which shows that the Project does not violate any of the major interfaces. Accordingly, Deepwater has a high degree of confidence in the technical ability to interconnect and deliver power from the Project. Deepwater has been working with LIPA on two interconnection requests since 2008 and is committed to complying with the capacity deliverability requirements, both those of the NYISO and LIPA itself. Deepwater is preparing to submit an interconnection request to the NYISO for the Shoreham 138 kV substation and will seek to obtain Capacity Resource Interconnection Service. ! 20
Page 2 and 3: BY COURIER AND ELECTRONIC MAIL May
Page 4 and 5: ! Executive Summary ! Enabled by th
Page 6 and 7: ! ! A final longer-term phase of de
Page 8 and 9: ! ! The Board of Managers also incl
Page 10 and 11: ! II. ! Project Description The Dee
Page 12 and 13: ! ! additional power will be divert
Page 14 and 15: ! ! As estimated by the New York St
Page 16 and 17: ! Environmental Benefits ! Improved
Page 18 and 19: ! ! Sources of Financing The projec
Page 20 and 21: ! ! approved Private Aid to Navigat
Page 24 and 25: ! VII. Technical ! The Project’s
Page 26 and 27: ! VII. Construction & Design Projec
Page 28 and 29: ! ! VIII. Socio-economic Considerat
Page 30 and 31: ! IX. Project Status ! On March 31,
Page 32 and 33: ! XI. Other Considerations ! Future
Page 34: ! ! Interconnections In New York, S

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