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

NGL Energy Partners LP (NYSE:NGL) and Rimrock Midstream, LLC are pleased to announce a binding open season starting next Monday, September 15th at 8:00 a.m. 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 5:00 p.m. 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 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.

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.

This press release includes “forward-looking statements.” All statements other than statements of historical facts included or incorporated herein may constitute forward-looking statements. Actual results could vary significantly from those expressed or implied in such statements and are subject to a number of risks and uncertainties. While NGL believes its expectations as reflected in the forward-looking statements are reasonable, NGL can give no assurance that such expectations will prove to be correct. The forward-looking statements involve risks and uncertainties that affect operations, financial performance, and other factors as discussed in filings with the Securities and Exchange Commission. Other factors that could impact any forward-looking statements are those risks described in NGL’s annual report on Form 10-K, quarterly reports on Form 10-Q, and other public filings. You are urged to carefully review and consider the cautionary statements and other disclosures made in those filings, specifically those under the heading “Risk Factors”. NGL undertakes no obligation to publicly update or revise any forward-looking statements except as required by law.