Siemens Celebrates Full Commercial Operation of Oklahoma Gas & Electric Company's Mustang Plant

• Siemens supplied seven advanced aeroderivative gas turbines and generators for Oklahoma Gas and Electric Company's Mustang Plant
• The company's SGT-A65 fast-ramping units can reach full power within ten minutes to provide grid flexibility and quickly meet peak power demand
• As the most powerful aeroderivative in its class, Siemens' technology is a low-cost solution to balance fluctuations in renewable power

Siemens celebrated Oklahoma Gas and Electric Company's (OG&E) gas-fired generating station, Mustang Energy Center, achieving full commercial operation in Oklahoma City, OK on March 31. As the technology partner for the project, Siemens supplied seven industry-leading aeroderivative gas turbines and generators for OG&E's Mustang Plant which now has an output of approximately 462 megawatts (MW), and is capable of generating and transmitting electricity onto the grid within ten minutes.

The seven SGT-A65 units can individually provide up to 66 MW of power, helping to maximize output and meet the power needs of approximately 400,000 homes in Oklahoma City and within the Southwest Power Pool transmission system. OG&E chose to replace the Mustang facility's 1950s area assets with Siemens' SGT-A65 technologies because they are the highest simple cycle efficiency gas turbines in their class and can deliver the largest power output with the smallest environmental footprint, resulting in significant cost and fuel economy savings.

With the new turbines and generators, OG&E's Mustang Plant will be highly responsive and fast-ramping with connections to nine transmission lines to ensure rapid electricity delivery during periods of renewable intermittency and emergency outages. The highly flexible SGT-A65 gas turbines (formerly known as Industrial Trent 60) offer these capabilities because they are derived from advanced aeroderivative technologies originally designed for aviation which can produce full power from a cold start in less than ten minutes.

"We're proud to usher in this new era of generation technology," said OGE Energy Corp. Chairman, President and CEO Sean Trauschke. "Mustang plays a critical role in the region's growth and economic development. We now have a plant that is more efficient, more sustainable and more responsive while maintaining its legacy of providing affordable, reliable power."

"We are very pleased to have supplied some of the most modern and advanced turbine technology to OG&E. These aeroderivative gas turbines are fast-ramping, efficient, and help integrate renewable energy technologies to ensure reliable power to customers in Oklahoma City and its surrounding areas. As more renewable energy comes online, these units are the perfect technology to support grid stability and help meet demand for peak power," said John Gibson, Country Division Lead for U.S. Power and Gas, Siemens."

For further information on the Power and Gas Division, please see https://www.siemens.com/businesses/us/en/power-and-gas.htm

For further information on Siemens SGT-A65 gas turbines, please see https://www.siemens.com/global/en/home/products/energy/power-generation/gas-turbines/sgt-a65-tr.html

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Siemens AG (Berlin and Munich) is a global technology powerhouse that has stood for engineering excellence, innovation, quality, reliability and internationality for 170 years. The company is active around the globe, focusing on the areas of electrification, automation and digitalization. One of the world's largest producers of energy-efficient, resource-saving technologies, Siemens is a leading supplier of efficient power generation and power transmission solutions and a pioneer in infrastructure solutions as well as automation, drive and software solutions for industry. With its publicly listed subsidiary Siemens Healthineers AG, the company is also a leading provider of medical imaging equipment – such as computed tomography and magnetic resonance imaging systems – and a leader in laboratory diagnostics as well as clinical IT. In fiscal 2017, which ended on September 30, 2017, Siemens generated revenue of €83.0 billion and net income of €6.2 billion. At the end of September 2017, the company had around 377,000 employees worldwide. Further information is available on the Internet at www.siemens.com.

Oklahoma Gas & Electric Company, a subsidiary of OGE Energy Corp. OGE, is Oklahoma's largest electric utility. For more than a century, we have provided customers in Oklahoma and western Arkansas the safe, reliable electricity needed to power their businesses and homes at rates below the national average. Our employees are committed to generating and delivering electricity, protecting the environment and providing excellent service to our 842,000 customers. OG&E has 6,667 MW of electric generation capacity fueled by low-sulfur coal, natural gas, wind and solar. OG&E is recognized as a leader in smart grid technology, leveraging this platform to provide customers with the award-winning SmartHours® program and setting the stage for an electric vehicle program that will include some level of public charging infrastructure, and advanced LED street and security lighting. OG&E employees live, work and volunteer in the communities we serve.

For more information about OG&E, visit us on the Internet at http://www.oge.com or follow us on Facebook: www.facebook.com/ogepower and Twitter: @OGandE.

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