Rimrock Midstream, LLC and NGL Energy Partners LP Announce Grand Mesa Pipeline Open Season Starting Monday, September 15, 2014

Rimrock Midstream, LLC and NGL Energy Partners LP (NYSE:NGL) are pleased to announce a binding open season starting next Monday, September 15th at 8:00am Central Standard Time for their joint venture Grand Mesa Pipeline, LLC (“Grand Mesa”) crude oil pipeline. The open season will close on Friday, October 3rd at 5:00pm Central Standard Time.

Potential shippers will have access to the open season documents upon execution of a confidentiality agreement with Grand Mesa; the confidentiality agreement can be obtained by accessing the website:

WWW.GRANDMESAPIPELINE.COM

The Grand Mesa pipeline, originating in Weld County, Colorado and extending 550 miles southeast to NGL’s crude oil storage terminal at the Cushing hub in Oklahoma, will provide critical takeaway capacity for crude oil producers in the Denver-Julesburg Basin. As proposed, the pipeline will be capable of receiving and transporting in excess of 130,000 barrels per day for delivery into the Cushing hub, which affords shippers access to the U.S. Midcontinent markets and the Texas Gulf Coast refinery complex. The pipeline not only supports the continued growth and production in the area, but does so in a cost-effective and environmentally responsible way by reducing the current utilization of rail and truck transportation.

About Rimrock Midstream, LLC

Rimrock Midstream, LLC is a strategic, growth-oriented company formed to acquire, develop and operate a portfolio of midstream energy infrastructure assets. Rimrock has been engaged in the business of acquiring, transporting and storing crude oil in Oklahoma, Kansas, Texas, North Dakota, Wyoming, Colorado, New Mexico and Utah. For more information, visit http://www.rimrockmidstream.com.

About NGL Energy Partners LP

NGL Energy Partners LP is a Delaware limited partnership. NGL owns and operates a vertically integrated energy business with five primary businesses: crude oil logistics, water solutions, NGL logistics, refined products/renewables and retail propane. NGL completed its initial public offering in May 2011. For further information, visit NGL’s website at http://www.nglenergypartners.com.