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Wind Energy Update October 6, 2012

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OG&Es Commitment to Wind Energy (2007) Make Oklahoma a national leader in renewable energy Mission Accomplished! Quadrupled OG&Es wind power capacity by 2012 Increased transmission capacity to enable OG&E and others to deliver wind-generated power from western Oklahoma to load centers Provided OG&E communities and customers choice of being up to 100% green power users Responsible development model: Executed first two MOAs with Wildlife Department to offset wildlife habitat impacts.

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OG&Es Renewable Efforts.. 50 MW Sooner wind farm 120 MW Centennial wind farm 101 MW OU Spirit wind farm 130 MW Taloga wind farm 150 MW Keenan wind farm 227 MW Crossroads wind farm 60 MW Blackwell wind farm Note: Orange denotes OG&E owned wind projects. Total of 840 MW installed by EOY 2012! 10% of annual energy produced

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4 Why Does OG&E want Wind? Helps to keep our electric prices low by offering: Fuel Hedge Emission Hedge Our Customers want WIND Contributed to diversification of rural income streams

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OG&E Transmission Expansion: 345kV Projects 5 Woodward (OG&E) Hitchland Tuco Cleveland Hugo Anadarko (OG&E) Seminole (OG&E) Muskogee (OG&E) Sunnyside (OG&E) Windspeed OG&E Projects Non-OG&E Ownership Sooner (OG&E) (To Rose Hill) (To Kansas) OG&E earned right to build ~ $1.5 Billion in new 345kV EHV transmission 2012 Potential Build

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Site Plan

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Map of Crossroads (Over 40,000 acres) 7

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Wind Turbine Overview

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Power Curves for Two Different Turbines 9

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Power Equation P= 1/2 p x A x V 3 10 Cant change air density Can work with Area (blade length) Can work with Velocity (tower heights, blade design)

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Turbine Characteristics Turbine 389 ft Overall height Football field 360 ft (Including end zones) Statue of Liberty 375 ft Nacelle mounting height 80 M (262 ft) Centennial Blade diameter 77 M (253 ft) OU Spirit Blade diameter 93 M (306 feet) Crossroad Wind diameter 101M (328 feet)

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Turbine Characteristics with 80 meter towers 77 Meter Blades Height 389 feet 93 Meter Blades Height 415 feet Swept Area +46% 101 Meter Blades Height 428 feet Swept Area +72%

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Current Technology Crossroads Siemens SWT 2.3 101 Rated 2.3 MW Cut-in wind speed 8.95 mph Rated wind speed 26.84 mph Cut-out wind speed 55.92 mph Tower height 80 m. Rotor diameter 101 m.

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Next Gen Technology - Crossroads Siemens SWT 3.0 101 Rated 3.0 MW Same specs as the 2.3-101, but with 50% fewer moving parts. No gearbox, uses a direct drive system. OG&E first to install this model in the U.S.

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15 Wind is Energy, Not Capacity

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16 Questions & Discussion