Revenue during the quarter grew 19.76 percent to $1,988 million from $1,660 million in the previous year period. Gross margin for the quarter contracted 997 basis points over the previous year period to 70.88 percent. Total expenses were 78.22 percent of quarterly revenues, down from 84.22 percent for the same period last year. This has led to an improvement of 600 basis points in operating margin to 21.78 percent.

Operating income for the quarter was $433 million, compared with $262 million in the previous year period.

However, the adjusted EBITDA for the quarter stood at $1,145 million compared with $1,056 million in the prior year period. At the same time, adjusted EBITDA margin contracted 602 basis points in the quarter to 57.60 percent from 63.61 percent in the last year period.

Alan Armstrong, president and chief executive officer, made the following comments: "We continue to differentiate ourselves with a focused strategy on natural gas infrastructure in support of consistent and sustainable growth in gas volumes. We continue to deliver top quartile EBITDA growth among our peers as we increased year-over-year Adjusted EBITDA for the 14th quarter in a row. This quarter, our growth was delivered despite some significant impacts from third-party outages and more extreme weather in the Rockies area, proving once again the resiliency of our business model."