| Boston Texas Land & Trust G-4-164323 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 85.3K | 3.63M | Jul 1997 – May 2019 |
| De Austin-Castillo GU G-4-164672 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 64.9K | 3.84M | Aug 1997 – Apr 2026 |
| Boston Texas Land & Trust G-4-172439 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 50.3K | 2.44M | Feb 1999 – Apr 2026 |
| Boston Texas Land & Trust G-4-178623 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 45.9K | 2.58M | Jul 2000 – Apr 2025 |
| Boston Texas Land & Trust G-4-169846 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 45.6K | 2.98M | Aug 1998 – Oct 2016 |
| Boston Texas Land & Trust G-4-173167 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 43.1K | 2.28M | Mar 1999 – Apr 2026 |
| De Austin-Castillo Gas Unit G-4-163815 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 42.1K | 3.56M | May 1997 – Apr 2026 |
| Dusek, F. J. Trust G-4-171579 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 38K | 2.67M | Nov 1998 – May 2024 |
| Adame GU G-4-176146 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 37.4K | 3.22M | Jan 2000 – Apr 2026 |
| Dusek, F. J. Trust G-4-171697 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 36.4K | 3.51M | Dec 1998 – Apr 2026 |
| Dusek, F. J. Trust G-4-175101 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 35.5K | 3.11M | Oct 1999 – Apr 2026 |
| De Austin-Castillo GU G-4-165693 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 34.8K | 2.34M | Oct 1997 – Apr 2026 |
| Dusek, F. J. Trust G-4-117878 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 34.1K | 1.6M | Jan 1993 – May 2006 |
| Dusek, F. J. Trust G-4-172511 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 33.6K | 2M | Feb 1999 – Apr 2026 |
| Bell G-4-176328 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 22.1K | 2.26M | Nov 1999 – Apr 2026 |
| Dusek, F. J. Trust G-4-173860 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 21.5K | 1.36M | Jun 1999 – Apr 2026 |
| De Austin-Castillo Gas Unit G-4-200050 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 20.5K | 1.47M | Feb 2004 – Apr 2026 |
| Dusek, F. J. Trust G-4-174028 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 18.8K | 911K | Aug 1999 – Sep 2017 |
| Castillo-Flores GU G-4-176036 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 15.4K | 1.65M | Nov 1999 – Apr 2026 |
| Coates "E" Gas Unit G-4-164454 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 13.9K | 826K | Aug 1997 – Jul 2023 |
| Dusek, F. J. Trust G-4-173111 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 13K | 1.01M | Mar 1999 – Oct 2022 |
| Machac Gas Unit G-4-167790 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 11.2K | 572K | Mar 1998 – Feb 1999 |
| Coates "E" Gas Unit G-4-168676 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 10.8K | 749K | Apr 1998 – Jul 2022 |
| De Austin-Castillo G-4-116053 | El Paso E & P Company, L. P. only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 10.8K | 732K | Jan 1993 – Jul 1999 |
| Castillo-Flores GU G-4-174498 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 10.8K | 3.46M | Aug 1999 – Aug 2014 |
| Castillo Deep Gas Unit G-4-170649 | EP Energy E&P Company, L.P. only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 9.42K | 964K | Apr 1998 – Aug 2011 |
| Adame Gas Unit G-4-175036 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 6.79K | 537K | Jul 2005 – Apr 2026 |
| Machac Gas Unit G-4-109029 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 6.52K | 324K | Jan 1993 – May 1998 |
| Adame Gas Unit G-4-170940 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 4.95K | 278K | Sep 1998 – Sep 2019 |
| Castillo-Flores Gas Unit G-4-53578 | El Paso Production Oil & Gas Co. only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 2.97K | 558K | Jan 1993 – Oct 2003 |
| Boston Texas Land & Trust G-4-181149 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 1.75K | 257K | Jan 2001 – Jan 2005 |
| Coates "A" G-4-209747 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 0 | 0 | — |
| Machac Gas Unit G-4-170230 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 0 | 0 | — |
| Coates "E" G-4-172587 | El Paso E & P Company, L. P. only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 0 | 0 | — |
| Castillo Deep GU G-4-172620 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 0 | 0 | — |
| Machac Gas Unit G-4-173170 | Coastal Oil & Gas Corporation only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 0 | 0 | — |
| Machac Gas Unit G-4-173184 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 0 | 0 | — |
| Coates "E" Gas Unit G-4-175980 | Merit Energy Company only | Jeffress, NE. (T, Lo.-Fb,a) | Hidalgo | 1 | 0 | 0 | — |