IN RE FIRSTENERGY SOLUTIONS CORP.

Attorney(s) appearing for the Case

ARGUED: Joseph F. Busa , UNITED STATES DEPARTMENT OF JUSTICE, Washington, D.C., for Appellant Federal Energy Regulatory Commission. Erin E. Murphy , KIRKLAND & ELLIS LLP, Washington, D.C., for Appellant Ohio Valley Electric Corporation. David A. Beck , CARPENTER LIPPS & LELAND LLP, Columbus, Ohio, for Appellant Office of the Ohio Consumers' Counsel. Gary M. Kaplan , FARELLA BRAUN + MARTEL LLP, San Francisco, California, for Appellant Maryland Solar Holdings, Inc. Pratik A. Shah , AKIN GUMP STRAUSS HAUER & FELD LLP, Washington, D.C., for Appellees. ON BRIEF: Joseph F. Busa, UNITED STATES DEPARTMENT OF JUSTICE, Washington, D.C., for Appellant Federal Energy Regulatory Commission. Erin E. Murphy , Subash S. Iyer , Kasdin M. Mitchell , KIRKLAND & ELLIS LLP, Washington, D.C., Mark McKane, P.C. , KIRKLAND & ELLIS LLP, San Francisco, California, for Appellant Ohio Valley Electric Corporation. Matthew A. Fitzgerald , MCGUIREWOODS LLP, Richmond, Virginia, John H. Thompson , MCGUIREWOODS LLP, Washington, D.C., Aaron G. McCollough , MCGUIREWOODS LLP, Chicago, Illinois, for Appellant Duke Energy Ohio, Inc. David A. Beck , Michael N. Beekhuizen , CARPENTER LIPPS & LELAND LLP, Columbus, Ohio, Candice Kline CARPENTER LIPPS & LELAND LLP, Chicago, Illinois, for Appellant Office of the Ohio Consumers' Counsel. Pratik A. Shah , Z.W. Julius Chen , Lide E. Paterno , AKIN GUMP STRAUSS HAUER & FELD LLP, Washington, D.C., John C. Fairweather , Lisa S. DelGrosso , BROUSE MCDOWELL, LPA, Akron, Ohio, David M. Zensky , Brian T. Carney , AKIN GUMP STRAUSS HAUER & FELD LLP, New York, New York, Gary Svirsky , Janine Panchok-Berry , O'MELVENY & MYERS LLP, New York, New York, Michael J. Kaczka , MCDONALD HOPKINS LLC, Cleveland, Ohio, Andrew Parlen , LATHAM & WATKINS LLP, New York, New York, Amy Caton, Paul Bradley O'Neill , Joseph A. Shifer , KRAMER LEVIN NAFTALIS & FRANKEL LLP, New York, New York, Aaron Renenger , Erin Elizabeth Dexter , MILBANK LLP, Washington, D.C., Alexander B. Lees , MILBANK LLP, New York, New York, Rocco I. Debitetto , Christopher B. Wick , HAHN LOESER & PARKS LLP, Cleveland, Ohio, for Appellees. Howard A. Learner , ENVIRONMENTAL LAW & POLICY CENTER, Chicago, Illinois, Donald B. Verrilli Jr. , MUNGER, TOLLES & OLSON LLP, Washington, D.C., for Amici Curiae.

BATCHELDER, J., delivered the opinion of the court in which DONALD, J., joined, and GRIFFIN, J., joined in part. GRIFFIN, J. (pp. 455-63), delivered a separate opinion concurring in part and dissenting in part.