. It provides additional information on the wind resource, economics, and operation of the DOE wind turbines installed recently in conjunction with the existing diesel power grid for the Naval Auxiliary Landing Field, San Clemente Island (SCI), California, project.The purpose of this report is to evaluate the wind power benefits and impacts to the SCI power system, including energy savings, emissions reduction, system stability, and decreased naval dependence on fossil fuel at the island. The primary goal of the SCI wind power system has been to operate with the existing diesel power plant and provide equivalent or better power quality and system reliability than the existing diesel system. The wind system is intended to reduce, as far as possible, the use of diesel fuel and the inherent generation of nitrogen oxide emissions and other pollutants.The first two NEG Micon model NM 225/30 225-kilowatt (kW) wind turbines were installed on February 5, 1998, and commissioned March 31, 1998. A third turbine of the same design was installed July 5, 1999, and commissioned October 22, 1999. This report describes the SCI wind resource and operational data gathered from January 1999 through June 30, 2000, as well as the ongoing cost of energy provided by the wind turbines on SCI. Earlier data from 1995 through 1998 are presented in NREL/SR-500-24663, cited above. In support of this objective, several years of data on the wind resources of SCI were collected and compared to historical data. The wind resource data were used in economic and feasibility studies for a wind-diesel hybrid installation for SCI.Because of their success with the current 675 kW wind turbine installation and subsequent receipt of the 2000 Federal Energy and Water Management Award, the Navy is considering future expansion of the SCI wind farm. iv AcknowledgmentsThe authors wish to extend special thanks to the following major contributors to the success of this project: The long-term objectives of the U.S. Navy for San Clemente Island (SCI) are to install about 8 megawatts (MW) of wind capacity and to develop a pumped-hydroelectric storage system. San Clemente Island's electrical system is powered with diesel generators, using wind energy to reduce the overall diesel-system operating costs and emissions.To accomplish this mission, the National Renewable Energy Laboratory (NREL), with the aid of the Naval Facilities Engineering Service Center (NFESC), was charged with collecting wind resource data, and then installing the wind turbine system. The first two wind turbine installations were funded through the U.S. Department of Energy (DOE)/SERDP; the third wind turbine was funded by DOE's Federal Energy Management Program (FEMP). This report summarizes the results of those tasks and the operational data acquired to date.The annual average wind speed measured from August 19, 1995, through July 30, 2000 at the SCI wind turbine site is 6.0 meters per second (m/s) (11.7 knots). The National Renewable Energy Laboratory and NFESC take these readings from a 42.7-m...