| Relationships | Role | Relationship Start | Relationship End |
| Gs Fund Holdings, L.L.C. | Parent | 12/18/2015 | |
| Broad Street Energy Advisors, L.L.C. | Parent | 5/21/2012 | |
| Goldman Sachs Group, Inc., The | Parent | 5/21/2012 | 12/17/2015 |
| Gs Wyvern Holdings Limited | Subsidary | 6/30/2013 | |
| Wsepo Investment Holdings | Subsidary | 1/6/2014 | |
| New Energy Investment Offshore, Ltd. | Subsidary | 2/20/2014 | |
| Serafina Logistics I, L.L.C. | Subsidary | 2/9/2015 | |
| Energy Servicesco Cayman L.P. | Subsidary | 3/13/2015 |