Summit Midstream Partners LP has agreed to acquire Outrigger DJ Midstream LLC and the operating subsidiaries of Sterling Energy Investments LLC for about $305 million total in cash to expand in Colorado.

The Outrigger DJ assets in Weld County, CO, within the Denver-Julesburg (DJ) Basin, comprise a 60 MMcf/d cryogenic natural gas processing plant, about 70 miles of low-pressure gas gathering lines, roughly 90 miles of high-pressure gas gathering lines, 12,800 hp of field and plant compression, and about 30 miles of crude oil gathering pipelines.

The Sterling subsidiaries, known collectively as Sterling DJ, are in Weld and Logan counties, and in Cheyenne County, NE. They include three cryogenic processing plants with nameplate capacity of 100 MMcf/d, about 450 miles of gas...