1) Air Products and Chemicals, Inc.

2) Alcoa USA Corp.

3) BLUEBONNET ELECTRIC COOPERATIVE, INC.

4) Brazos River Authority

5) CDM Smith Inc.

6) Celanese International Corporation

7) Chisholm Trail Disposal, LLC

8) Covestro

9) Cowboy Aggregates, LLC

10) Eastman Chemical - Texas Operations

11) El Paso and Hudspeth Counties Regional Water Supply Corporation

12) El Paso Water

13) Flint Hills Resources, LLC

14) Frontier Waste Solutions

15) Georgia-Pacific LLC

16) GEXA Energy

17) Green Group Holdings, LLC

18) Guadalupe-Blanco River Authority

19) Guardian Industries Holdings, LLC

20) Infor(US), LLC

21) INV Nylon Chemicals Americas, LLC

22) Koch Ag & Energy Solutions, LLC

23) Koch Engineered Solutions, LLC

24) Koch Supply & Trading, LP

25) Lone Star Transmission LLC

26) Lubbock Power and Light

27) NextEra Energy Inc.

28) NextEra Energy Resources LLC

29) North Texas Municipal Water District

30) Sky Global Partners, LLC

31) SLR Property I, LP

32) Summit Next Gen, LLC

33) Trellis Company and Subsidiaries

34) Waste Control Specialist, LLC