| | | | | |  | AEP | Utility | American Electric Power (AEP) ranks among the nation's largest generators of electricity, owning nearly 38,000 megawatts of generating capacity in the U.S. AEP also owns the nation's largest electricity transmission system, a nearly 39,000-mile network that includes more 765 kilovolt extra-high voltage transmission lines than all other U.S. transmission systems combined. AEP's transmission system directly or indirectly serves about 10 percent of the electricity demand in the Eastern Interconnection, the interconnected transmission system that covers 38 eastern and central U.S. states and eastern Canada, and approximately 11 percent of the electricity demand in ERCOT, the transmission system that covers much of Texas. AEP's utility units operate as AEP Ohio, AEP Texas, Appalachian Power (in Virginia, West Virginia), AEP Appalachian Power (in Tennessee), Indiana Michigan Power, Kentucky Power, Public Service Company of Oklahoma, and Southwestern Electric Power Company (in Arkansas, Louisiana and east Texas). AEP's headquarters are in Columbus, Ohio. | |  | Duke Energy | Utility | Duke Energy makes life better for millions of people every day by providing electric and gas services in a sustainable way – affordable, reliable and clean.
We are one of the largest electric power companies in the United States, supplying and delivering energy to approximately 4 million U.S. customers. We have approximately 35,000 megawatts of electric generating capacity in the Carolinas and the Midwest, and natural gas distribution services in Ohio and Kentucky. Our commercial and international businesses own and operate diverse power generation assets in North America and Latin America, including a portfolio of renewable energy assets.
Headquartered in Charlotte, N.C., Duke Energy is a Fortune 500 company traded on the New York Stock Exchange under the symbol DUK. | |  | EPRI | Utility |
The Electric Power Research Institute, Inc. conducts research, development and demonstration (RD&D) relating to the generation, delivery and use of electricity for the benefit of the public. An independent, nonprofit organization, we bring together scientists and engineers as well as experts from academia and the industry to help address challenges in electricity.
Our work spans nearly every area of electricity generation, delivery and use, management and environmental responsibility. We provide both short- and long-term solutions in these research areas for the electricity industry, its customers and society.
| |  | Korea Electric Power Corporation | Utility | | |  | Korea Electrotechnology Research Institute | Utility; Testing | | |  | Oncor Electric Delivery | Utility | | | | State Electric Grid of China | Utility | | |  | | Utility | |
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