Electrical Interface/Connections Electrical interface covers the turbine transformer and the individual turbine's share of cables to the substation. These data originally came from the WindPACT balance-of-station study (Shafer 2001) and were used in this model as originally derived. Electrical interface/connection cost factor ($/kW) = 3.49E-6 * machine rating 2-0.0221 * machine rating + 109.7 Electrical interface/connection cost = machine rating * electrical cost factor above Engineering, Permits Engineering and permits covers the cost of designing and permitting the entire wind facility, allocated on a turbine-by-turbine basis. These costs are highly dependent upon the location, environmental conditions, availability of electrical grid access, and local permitting requirements. The formulas provided here were first derived from the WindPACT balance-ofstation cost study (Shafer 2001) and were used in this model without modification. Engineering, permits cost factor ($/kW) = 9.94E-4 * machine rating + 20.31 Engineering, permits cost = machine rating * engineering, permits cost factor above Land Lease Costs Wind turbines normally pay lease fees for land used for wind farm development. This cost is principally based on the land used by the turbine. The factors applied in different wind farm developments vary widely depending on the wind class of the particular site, the nature and value of the land, and the potential market price for the wind. No single number or model is currently available to predict these costs based on turbine rating, size, or wind class. The number used in this model is based on a cost per kilowatt-hour of production making it highly variable with wind class and machine performance. This cost was proposed for the LWST Project and defined in the report on pathways analysis (Malcolm 2006

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NREL prints on paper that contains recycled contentThis report is being disseminated by the U.S. Department of Energy (DOE). As such, this document was prepared in compliance with Section 515 of the Treasury and General Government Appropriations Act for fiscal year 2001 (public law 106-554) and information quality guidelines issued by DOE. Though this report does not constitute "influential" information, as that term is defined in DOE's information quality guidelines or the Office of Management and Budget's Information Quality Bulletin for Peer Review, the study was reviewed both internally and externally prior to publication. For purposes of external review, the study benefited from the advice and comments of seven wind industry and trade association representatives, nine consultants, one academic institution, and five U.S. Government employees.

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