1) 3 Elements Group, SA

2) Air Products and Chemicals, Inc.

3) Alcoa USA Corp.

4) Arkansas Electric Cooperatives, Inc.

5) Bayer U.S. LLC

6) BLUEBONNET ELECTRIC COOPERATIVE, INC.�

7) Brazos River Authority

8) CDM Smith Inc.

9) Celanese International Corporation

10) Chisholm Trail Disposal, LLC

11) Cielo Wind Power LLC

12) Covestro LLC

13) Daikin Comfort Technologies North America

14) Eastman Chemical - Texas Operations

15) El Paso and Hudspeth Counties Regional Water Supply Corporation

16) El Paso Water

17) Flint Hills Resources, LLC

18) Foster, Paul

19) Frontier Waste Solutions

20) Georgia-Pacific LLC

21) GEXA Energy

22) Green Group Holdings, LLC

23) Guadalupe-Blanco River Authority

24) Guardian Industries Holdings, LLC

25) Infor(US), LLC

26) INV Nylon Chemicals Americas, LLC

27) Koch Ag & Energy Solutions, LLC

28) Koch Engineered Solutions, LLC

29) Koch Supply & Trading, LP

30) Lone Star Transmission LLC

31) Lubbock Power and Light

32) New Braunfels Utilities

33) NextEra Energy Inc.

34) NextEra Energy Resources LLC

35) North Texas Municipal Water District

36) PCII, LLC

37) Phillips Infrastructure Corporation

38) San Jacinto River Authority

39) SL ENERGY POWER PLANT I, LLC

40) SLR Property I, LP

41) Southern Spirit Transmission, LLC C/O Pattern Energy Group, LP

42) TEXSAR, Inc.

43) Trellis Company and Subsidiaries

44) Uranium Energy Corp

45) Waste Control Specialist, LLC