ACCEPTED 03-14-00130-CV 4660635 THIRD COURT OF APPEALS AUSTIN, TEXAS 3/26/2015 3:37:05 PM JEFFREY D. KYLE CLERK FREDERICK, PERALES, ALLMON & ROCKWELL, P.C. FILED IN 3rd COURT OF APPEALS Rio Grande, Suite 200 AUSTIN, TEXAS Austin, TX 78701 3/26/2015 3:37:05 PM (512) 469-6000 Phone JEFFREY D. KYLE Clerk (512) 482-9346 Fax March 26, 2015 Mr. Jeffrey D. Kyle, Clerk of the Third Court of Appeals via e-file Price Daniel, Sr. Building, Room 101 W. 14th Street Austin, Texas 78701 Re: Court of Appeals No. 03-14-00130-CV; Sierra Club and Public Citizen v. Texas Commission on Environmental Quality and Southwestern Electric Power Company.

Dear Mr. Kyle: In response to your letter dated March 24, 2015, please know that I intend to argue the above-referenced case before the Court on May 6, 2015 at 1:30 PM, on behalf of Appellants Sierra Club and Public Citizen. Please feel free to contact me if you have any questions.

Sincerely, /s/ Eric Allmon Eric Allmon Frederick, Perales, Allmon & Rockwell, P.C.

707 Rio Grande, Ste. 200 Austin, Texas 78701 (512) 469-6000 (512) 482-9346 (facsimile) [email protected] CERTIFICATE OF SERVICE By my signature below, I certify that on this 26th day of March, 2015, a copy of the foregoing document was served upon the parties identified below via electronic service.

/s/ Eric Allmon Eric Allmon FOR SOUTHWESTERN FOR THE TEXAS COMMISSION ELECTRIC POWER CO.: ON ENVIRONMENTAL QUALITY Derek Seal Anthony Grigsby Congress Ave., Ste. 2100 Office of the Attorney General Austin, Texas 78701 P.O. Box 12548 (MC-066) Tel: (512) 370-2800 Austin, Texas 78711-2548 Fax: (512) 370-2850 Tel: (512) 463-2012 [email protected] Facsimile: (512) 320-0911 [email protected]