El Paso Natural Gas Company, L.L.C.; Semi-Annual Activity Report Washington Ranch Storage Facility Docket Nos. RP72-6, et al.

January 9, 2017 Federal Energy Regulatory Commission 888 First Street, N.E. Washington, D.C. 20426 Attention: Ms. Kimberly D. Bose, Secretary Re: El Paso Natural Gas Company, L.L.C.; Semi-Annual Activity Report Washington Ranch Storage Facility Docket Nos. RP72-6, et al., and CP79-224 Commissioners: El Paso Natural Gas Company, L.L.C. ("EPNG") is filing pursuant to the requirements of the Federal Energy Regulatory Commission ("Commission") in Docket Nos. RP72-6, et al., and CP79-224, the semi-annual activity report for the Washington Ranch Storage Facility. Description of Proceeding Pursuant to the Commission approved Stipulation and Agreement in the Settlement of Restructuring, Rate, and Related Proceedings filed January 29, 1993 in Docket Nos. RS92-60-000, et al., EPNG's Washington Ranch Storage Facility located in Eddy County, New Mexico is operated primarily as an adjunct to EPNG's transmission system for load balancing, line pack and pressure control. Additionally, as authorized in Docket No. RP05-422-000, EPNG offers interruptible storage services under Rate Schedule ISS. Description of Items Filed Pursuant to ordering paragraph (H) of the Commission Order Approving Stipulation and Agreement Settling Proceedings and Prescribing Permanent Allocation Plan, Granting Certificates of Public Convenience and Necessity, Granting Abandonments, and Granting Adjustments issued March 26, 1981 in Docket Nos. RP72-6, et al., and CP79-224, EPNG is submitting its semi-annual activity report for the Washington Ranch Storage Facility for the period May 1, 2016 through October 31, 2016. This report has also incorporated additional Washington Ranch Storage Field information required by Ordering Paragraph (C) of the Commission Order in Docket No. CP15-516-000 issued August 18, 2015.

Federal Energy January 9, 2017 Regulatory Commission Page Two Filing Information EPNG is efiling this report with the Commission's Secretary in accordance with the Commission's Order No. 703, Filing Via the Internet, guidelines issued on November 15, 2007 in Docket No. RM07-16-000. I have read these documents and the information contained therein is true, to the best of my knowledge and belief. Respectfully submitted, EL PASO NATURAL GAS COMPANY,L.L.C. By /s/ Francisco Tarin Director Regulatory Affairs Department Enclosures

Certificate of Service I hereby certify that I have this day caused a copy of the foregoing documents to be served upon each person designated on the official service list compiled by the Commission's Secretary in this proceeding in accordance with the requirements of Section 385.2010 of the Federal Energy Regulatory Commission's Rules of Practice and Procedure. Dated at Colorado Springs, Colorado as of this 9 th day of January, 2017. /s/ Francisco Tarin P.O. Box 1087 Colorado Springs, Colorado 80944 (719) 667-7517

Docket Nos. RP72-6, et al., CP79-224, and CP15-516 EL PASO NATURAL GAS COMPANY, L.L.C. SEMI-ANNUAL ACTIVITY REPORT WASHINGTON RANCH STORAGE FACILITY El Paso Natural Gas Company, L.L.C. ("EPNG") is submitting this report pursuant to ordering paragraph (H) of the Commission Order Approving Stipulation and Agreement Settling Proceedings and Prescribing Permanent Allocation Plan, Granting Certificates of Public Convenience and Necessity, Granting Abandonments, and Granting Adjustments issued March 26, 1981 in Docket Nos. RP72-6, et al., and CP79-224. Unless otherwise stated, all volumes are reported using a pressure base of 14.73 psia and a temperature base of 60 F. All volumes are listed in Mcf, unless otherwise stated. The storage activity cycle covered in this report is from May 1, 2016 through October 31, 2016. 1) The daily volume of natural gas injected into and withdrawn from the storage facility. Attached as Exhibit 1 is the list of daily injection and withdrawal volumes for Washington Ranch for the May 1, 2016 through October 31, 2016 reporting period. 2) The volume of natural gas in the storage facility at the end of the reporting period. The volume of gas in the reservoir as of October 31, 2016 was 59,478,854 Mcf at 14.73 psia. 3) The maximum daily injection or withdrawal rate experienced during the activity period, and the average working pressure on such maximum days, taken at a central measuring point where the total volume injected or withdrawn is measured. Working Telemetered Data Volume (MMcf) Pressure (psia) Maximum Injection: 99.3 700 Maximum Withdrawal: 186.3 787.1 4) Results of any tracer program by which the leakage of injected gas may be determined. If leakage of gas exists, the report should show the estimated total volume of gas leakage, the volume of recycled gas and the estimated remaining inventory of gas in the reservoir at the end of the reporting period. Washington Ranch Semi-Annual Storage Report Page 1 of 3

Docket Nos. RP72-6, et al., CP79-224, and CP15-516 EL PASO NATURAL GAS COMPANY, L.L.C. SEMI-ANNUAL ACTIVITY REPORT WASHINGTON RANCH STORAGE FACILITY No tracer surveys were conducted during the May 1, 2016 through October 31, 2016 reporting period. There was no indication of any gas leakage from the field/reservoir during the May 1, 2016 through October 31, 2016 reporting period. 5) Any surveys of pressures in gas wells, and the results of back-pressure tests conducted during the reporting period. No bottom-hole pressure survey was conducted during the May 1, 2016 through October 31, 2016 reporting period. Further, there were no water levels detected in observation wells. No back-pressure tests were conducted during the May 1, 2016 through October 31, 2016 reporting period. As the gas storage reservoir in Washington Ranch Field is not an aquifertype reservoir, no pump-tests were performed. 6) The latest revised structure and isopachous contour maps showing the location of the wells, the location and extent of the gas bubble in the storage reservoir for aquifer-type reservoirs and in any other reservoirs of the project in which gas bubbles are known to exist, and the location of the gas-water contact if one exists. This map need not be filed if there is no material change from the map previously filed. No revisions have occurred to the structure or isopachous contour maps during the May 1, 2016 through October 31, 2016 reporting period. The location and extent of the gas bubble is not applicable for the type of reservoir which exists in the Washington Ranch Gas Storage Field. 7) For the reporting period, a summary of wells drilled, recompleted or workedover, with subsea depth of formation and casing settings. No drilling, re-completion, or work-over activity occurred during the May 1, 2016 through October 31, 2016 reporting period. Washington Ranch Semi-Annual Storage Report Page 2 of 3

Docket Nos. RP72-6, et al., CP79-224, and CP15-516 EL PASO NATURAL GAS COMPANY, L.L.C. SEMI-ANNUAL ACTIVITY REPORT WASHINGTON RANCH STORAGE FACILITY 8) Discussion of current operating problems and conclusions. EPNG did not experience any operating problems in the Washington Ranch Storage Facility during the May 1, 2016 through October 31, 2016 reporting period. 9) Such other data or reports which may aid the Commission in the evaluation of the storage project. EPNG did not experience any activities or events that would necessitate the generation of additional reports or data for the Washington Ranch Storage Facility during the May 1, 2016 through October 31, 2016 reporting period. Washington Ranch Semi-Annual Storage Report Page 3 of 3

Exhibit 1 El Paso Natural Gas Company, L.L.C. Docket No. RP72 6, et al, CP79 224 and CP15 516 Daily Volumes of Natural Gas Injection into and Withdrawal from the Washington Ranch Storage Field DATE Injection Net Mcf Injection Net Dth Withdrawal Net Mcf Withdrawal Net Dth 5/1/2016 36475 38381 0 0 5/2/2016 0 0 96884 102078 5/3/2016 0 0 37545 39607 5/4/2016 0 0 0 0 5/5/2016 57499 60680 37 39 5/6/2016 80893 85470 1 1 5/7/2016 96244 101689 0 0 5/8/2016 96116 101101 0 0 5/9/2016 93218 98212 0 0 5/10/2016 63823 67048 0 0 5/11/2016 85128 89519 2 2 5/12/2016 82475 86326 2 2 5/13/2016 47100 49309 1 1 5/14/2016 88689 93014 0 0 5/15/2016 87311 91385 0 0 5/16/2016 88788 93369 3 3 5/17/2016 78419 82566 2 2 5/18/2016 71585 75171 0 0 5/19/2016 19954 20951 2 2 5/20/2016 93007 97515 0 0 5/21/2016 71009 74341 1 1 5/22/2016 71839 75131 2 2 5/23/2016 20077 21047 0 0 5/24/2016 5761 6037 0 0 5/25/2016 91987 96427 0 0 5/26/2016 85192 89139 3 3 5/27/2016 43070 45135 1 1 5/28/2016 46105 47995 0 0 5/29/2016 40186 41985 0 0 5/30/2016 7626 7940 0 0 5/31/2016 0 0 0 0 6/1/2016 0 0 43828 45792 6/2/2016 0 0 75076 78538 6/3/2016 23 24 14830 15529 6/4/2016 0 0 0 0 6/5/2016 527 552 0 0 6/6/2016 78865 82265 1 1 6/7/2016 84923 88798 2 2 6/8/2016 19405 20255 0 0 6/9/2016 59128 62434 0 0 6/10/2016 56117 59052 2 2 * Note that yellow highlighting indicates peak date injections/withdrawals. Exhibit 1 Page 1 of 5

Exhibit 1 El Paso Natural Gas Company, L.L.C. Docket No. RP72 6, et al, CP79 224 and CP15 516 Daily Volumes of Natural Gas Injection into and Withdrawal from the Washington Ranch Storage Field DATE Injection Net Mcf Injection Net Dth Withdrawal Net Mcf Withdrawal Net Dth 6/11/2016 89305 93506 0 0 6/12/2016 85684 89776 1 1 6/13/2016 54340 56967 2 2 6/14/2016 49182 51639 2 2 6/15/2016 12006 12677 3860 4058 6/16/2016 0 0 0 0 6/17/2016 0 0 0 0 6/18/2016 0 0 0 0 6/19/2016 54195 56695 0 0 6/20/2016 19281 20114 1 1 6/21/2016 0 0 51398 53744 6/22/2016 0 0 71911 75367 6/23/2016 0 0 13310 13957 6/24/2016 78926 82777 0 0 6/25/2016 85945 90037 0 0 6/26/2016 78566 82224 1 1 6/27/2016 0 0 35158 36808 6/28/2016 0 0 186306 195222 6/29/2016 0 0 19542 20492 6/30/2016 0 0 0 0 7/1/2016 5894 6181 0 0 7/2/2016 67482 70301 0 0 7/3/2016 71196 74169 1 1 7/4/2016 32063 33444 2 2 7/5/2016 0 0 65031 67792 7/6/2016 0 0 75008 78259 7/7/2016 23 24 9233 9650 7/8/2016 11007 11509 0 0 7/9/2016 0 0 87904 92028 7/10/2016 0 0 13045 13670 7/11/2016 0 0 13503 14151 7/12/2016 0 0 32776 34357 7/13/2016 0 0 0 0 7/14/2016 42 44 85494 89629 7/15/2016 0 0 94098 98665 7/16/2016 53678 56070 2 2 7/17/2016 84561 88216 2 2 7/18/2016 23140 24145 74 77 7/19/2016 0 0 81370 84928 7/20/2016 0 0 95424 99774 7/21/2016 0 0 109973 115286 * Note that yellow highlighting indicates peak date injections/withdrawals. Exhibit 1 Page 2 of 5

Exhibit 1 El Paso Natural Gas Company, L.L.C. Docket No. RP72 6, et al, CP79 224 and CP15 516 Daily Volumes of Natural Gas Injection into and Withdrawal from the Washington Ranch Storage Field DATE Injection Net Mcf Injection Net Dth Withdrawal Net Mcf Withdrawal Net Dth 7/22/2016 0 0 26265 27548 7/23/2016 0 0 0 0 7/24/2016 23 24 0 0 7/25/2016 0 0 35749 37484 7/26/2016 0 0 11035 11572 7/27/2016 0 0 108060 113367 7/28/2016 0 0 101239 106243 7/29/2016 0 0 78332 82218 7/30/2016 37122 39161 0 0 7/31/2016 77933 82206 0 0 8/1/2016 68085 72326 1 1 8/2/2016 24 25 33403 35100 8/3/2016 0 0 25725 27058 8/4/2016 0 0 42823 45132 8/5/2016 0 0 85854 90482 8/6/2016 0 0 56365 59407 8/7/2016 52 55 0 0 8/8/2016 64826 68248 0 0 8/9/2016 62986 66410 1 1 8/10/2016 0 0 116365 122570 8/11/2016 2209 2322 26282 27630 8/12/2016 12087 12747 76 81 8/13/2016 0 0 0 0 8/14/2016 0 0 0 0 8/15/2016 0 0 0 0 8/16/2016 0 0 0 0 8/17/2016 53 56 0 0 8/18/2016 67472 71012 1 1 8/19/2016 43899 46252 0 0 8/20/2016 0 0 12432 13106 8/21/2016 27637 29178 0 0 8/22/2016 98101 103755 0 0 8/23/2016 95925 101321 0 0 8/24/2016 21835 22980 0 0 8/25/2016 0 0 0 0 8/26/2016 29775 31409 0 0 8/27/2016 0 0 0 0 8/28/2016 65100 68882 0 0 8/29/2016 21576 22757 1 1 8/30/2016 0 0 0 0 8/31/2016 0 0 66988 70786 * Note that yellow highlighting indicates peak date injections/withdrawals. Exhibit 1 Page 3 of 5

Exhibit 1 El Paso Natural Gas Company, L.L.C. Docket No. RP72 6, et al, CP79 224 and CP15 516 Daily Volumes of Natural Gas Injection into and Withdrawal from the Washington Ranch Storage Field DATE Injection Net Mcf Injection Net Dth Withdrawal Net Mcf Withdrawal Net Dth 9/1/2016 0 0 95130 100449 9/2/2016 1502 1585 5401 5701 9/3/2016 0 0 0 0 9/4/2016 42057 44408 1 1 9/5/2016 81988 86400 0 0 9/6/2016 70746 74558 1 1 9/7/2016 76 81 31024 32703 9/8/2016 0 0 68013 71668 9/9/2016 0 0 3618 3814 9/10/2016 63176 66627 1 1 9/11/2016 27915 29375 0 0 9/12/2016 75 79 17797 18737 9/13/2016 0 0 97235 102515 9/14/2016 0 0 9012 9505 9/15/2016 0 0 0 0 9/16/2016 70141 73661 0 0 9/17/2016 48898 51434 1 1 9/18/2016 0 0 0 0 9/19/2016 0 0 31508 33134 9/20/2016 0 0 89683 94348 9/21/2016 6271 6607 161744 170415 9/22/2016 0 0 0 0 9/23/2016 53581 56155 0 0 9/24/2016 90502 94808 0 0 9/25/2016 92225 96519 0 0 9/26/2016 6559 6851 19854 20766 9/27/2016 0 0 89785 94019 9/28/2016 0 0 45442 47645 9/29/2016 0 0 0 0 9/30/2016 0 0 0 0 10/1/2016 69774 72809 0 0 10/2/2016 51250 53558 0 0 10/3/2016 47974 50261 0 0 10/4/2016 82272 85800 0 0 10/5/2016 70493 73524 0 0 10/6/2016 88289 92241 0 0 10/7/2016 63958 66831 52 55 10/8/2016 16845 17543 7850 8181 10/9/2016 54686 57276 0 0 10/10/2016 90318 94433 0 0 10/11/2016 58060 60682 0 0 * Note that yellow highlighting indicates peak date injections/withdrawals. Exhibit 1 Page 4 of 5