This subcontract report details work completed by Garrad Hassan America, Inc. (GL GH) and provides charts, figures and qualitative opinions on trends in wind energy operations costs and reliability in the United States. This work was used to support the development an NREL historical turbine operating cost and reliability baseline. The results presented have been developed from a database maintained by GL GH containing the operating costs for 66 wind projects in North America with over 5,000 wind turbines and approximately 7,000 MW of capacity. maintained by GL GH containing the operating costs for 66 wind projects in North America with over 5,000 wind turbines and approximately 7,000 MW of capacity.