Table of Contents Exhibit Number Title #10.36 – Form of Restricted Stock Award Agreement between the Company and non-employee directors of the Company. (Exhibit 10.5 to the Company’s Current Report on Form 8-K filed on February 5, 2018) #10.37 – Change of Control Agreement between Mary E. Kipp and the Company, dated as of May 31, 2019. (Exhibit 10.1 to the Company's Current Report on Form 8-K, filed on June 3, 2019) #10.38 – Change of Control Agreement between Nathan T. Hirschi and the Company, dated as of May 31, 2019. (Exhibit 10.2 to the Company's Current Report on Form 8-K, filed on June 3, 2019) #10.39 – Change of Control Agreement between Adrian J. Rodriguez and the Company, dated as of May 31, 2019. (Exhibit 10.3 to the Company's Current Report on Form 8-K, filed on June 3, 2019) #10.40 – Retention Agreement between Rocky R. Miracle and the Company, dated as of May 31, 2019. (Exhibit 10.4 to the Company's Current Report on Form 8-K, filed on June 3, 2019) #10.41 – Retention Agreement between Steven T. Buraczyk and the Company, dated as of June 30, 2019. (Exhibit 10.1 to the Company's Current Report on Form 8-K, filed on July 1, 2019) #10.42 – Separation Agreement between Mary E. Kipp and the Company, effective as of July 1, 2019. (Exhibit 10.2 to the Company's Current Report on Form 8-K, filed on July 1, 2019) #10.43 – Form of Restricted Stock Award Agreement between the Company and Mary E. Kipp, former Chief Executive Officer of the Company, dated July 31, 2019. (Exhibit 10.01 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2019) Exhibit 23 – Consent of Experts: *23.01 – Consent of KPMG LLP (set forth on page 133 of this report) Exhibit 24 – Power of Attorney: *24.01 – Power of Attorney (set forth on page 131 of this report) *24.02 – Certified copy of resolution authorizing signatures pursuant to Power of Attorney Exhibit 31 and 32 – Certifications: *31.01 – Certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 *32.01 – Certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 Exhibit 99 – Additional Exhibits: 99.01 – Agreed Order, entered August 30, 1995, by the Public Utility Commission of Texas. (Exhibit 99.31 to the Company's Registration Statement No. 33-99744 on Form S-1) 99.02 – Final Order, entered September 24, 1998, by the New Mexico Public Utility Commission. (Exhibit 99.31 to the Company’s Annual Report on Form 10-K for the year ended December 31, 1998) 99.03 – Final Order, entered June 8, 1999, by the Public Utility Commission of Texas. (Exhibit 99.01 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 1999) 99.04 – Final Order, entered January 8, 2002, by the New Mexico Public Utility Commission. (Exhibit 99.05 to the Company’s Annual Report on Form 10-K for the year ended December 31, 2001) Exhibit 101 – XBRL – Related Documents: *101.INS – Inline XBRL Instance Linkbase Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document. *101.SCH – Inline XBRL Taxonomy Extension Schema Linkbase Document *101.CAL – Inline XBRL Taxonomy Extension Calculation Linkbase Document *101.DEF – Inline XBRL Taxonomy Extension Definition Linkbase Document *101.LAB – Inline XBRL Taxonomy Extension Label Linkbase Document *101.PRE – Inline XBRL Taxonomy Extension Presentation Linkbase Document 104 – The cover page from the Company's Annual Report on Form 10-K for the twelve months ended December 31, 2019, has been formatted in Inline XBRL. 128