OPPD’s Wind Development in Nebraska Nebraska Wind Energy Conference November 9, 2009 Christene Bywater, P.E. Project Manager

Sustainable Energy & Environmental Stewardship Goal of 10% Renewables by 2020 About 400 MW Why? Helps to defer baseload generation Helps minimize the risk of a RES Will help minimize carbon tax costs to OPPD

OPPD Wind Projects Valley Turbine – 660kw 10 MW from Ainsworth Wind Farm 25 MW from Elkhorn Ridge Wind Farm Possible new site on Interstate 80 west of Omaha

OPPD Wind Projects 80 MW RFP Released in Aug 2008 Received bids in Oct Proposals Anticipated Award on April 1, 2009 April 1, 2009 also Transition Date from MAPP to SPP Actual Award August 14, 2009

SPP Transition Approvals Needed – Interconnection – Delivery MAPP – 6 months SPP – 2 years

Flat Water Wind Farm 60 MW Flat Water Wind Farm JW Prairie Wind Power Richardson County, NE 42% Capacity Factor 40 GE 1.5 MW Turbines Construction of Substation started in October, 2009 COD is anticipated June 30, 2010

Substation Design Site Grading Plan and Substation Ground Plan Designed by Both Parties

Substation Design All Metering by OPPD on Our Sub Site 34.5 kV Underground Collector System Breakers – Both Subs 34.5/161 kV Transformer – 40/53/66 MVA

Transmission Line Details Line 138, Single Circuit 161 kV Transmission Line – From KS/NE border to NPPD Sub 975 in Humboldt, NE – Weathering Steel H-frame Structures 2 New 70 ft. Substation Deadend Structures

USFW & NGP Precautionary Measures for Migratory Birds – Asking JW Prairie for Bird Diverters on Shieldwires – Negotiations are still underway

Thank You