John D. Chandler
Senior Vice President & Chief Financial Officer at Williams Companies
Thanks, Alan. At a very high-level summary, the quarter benefited from nice increases in profitability from our Northeast gathering systems, an uplift in revenues on our Transco pipeline from new projects that have been put into service over the last year and contributions from our upstream operations in the Wamsutter. These positives were offset somewhat by slightly higher operating expenses resulting from increased incentive compensation expenses, reflective of the strong performance that is unfolding this year. And you can see the strong performance in our statistics on this page. In fact, once again, we saw improvements in our key financial metrics. First, our adjusted EBITDA for the quarter was up $77 million or 6%, and we have seen a 9% increase in EBITDA year-to-date. We will discuss EBITDA variances in more depth in a moment. Adjusted EPS for the quarter increased $0.02 a share or 8% and AFFO grew for the quarter similar to our growth in EBITDA. AFFO is essentially cash from operations, including JV cash flows and excluding working capital fluctuations.
If you put our year-to-date AFFO of $1.948 billion up against our capital investments year-to-date of $737 million and our dividends of $996 million, we have generated about $250 million of excess cash year-to-date. Included, as a side note, included in the capital investments is about $160 million of maintenance capital. Also, you can see our dividend coverage based on AFFO divided by dividends is a healthy 1.96 times year-to-date. This strong cash generation and strong EBITDA for the quarter, along with continued capital discipline, has led to our exceeding our leverage metric goal where were currently set at 4.13 times debt-to-EBITDA. You will see later in our guidance update in this deck that weve moved our guidance for the year from being around 4.2 times by the end of the year to now less than 4.2 times debt-to-EBITDA for the year. So really strong performance for the quarter and the year, and the fundamentals are set up for a good second half of the year. So now lets dig a little deeper into our EBITDA results for the quarter. Again, Williams performed very well this quarter. Our upstream operations added $19 million of incremental EBITDA this quarter.
And this EBITDA was entirely from our Wamsutter upstream acreage. Remember that we owned the BP Wamsutter acreage the entire quarter, but only owned the Southland acreage for one month during the quarter. Production from the combined Wamsutter assets totaled 6.9 Bcf for the quarter. The Haynesville upstream acreage produced very little EBITDA, given it has only a small amount of PDP reserves. And therefore, it will take some time before we see new production and therefore, new EBITDA coming from these assets. Now moving to our Transmission & Gulf of Mexico assets. They produced results that were $31 million more than the same period last year. New transmission pipeline projects added $25 million in incremental revenues versus the second quarter last year, including the Southeastern Trails project that went into service during the fourth quarter of last year, as well as a portion of the Leidy South project that also went into service in the fourth quarter of last year. And you can see this evidenced in the growth in our firm reserve capacity, which is up 5% from the second quarter of 2020.
In addition, our Gulf of Mexico revenues were up somewhat due to less shut-in issues compared to the second quarter of last year. In addition, commodity margins from processing volumes for processing the Gulf of Mexico gas was about $5 million due to higher NGL prices and higher volumes. These revenue increases were offset somewhat by a slight increase in operating expenses, again, mostly due to employee-related expenses, a large part of which can be attributed to higher incentive compensation accruals. The Northeast G&P segment continues to come on strong, contributing $46 million of additional EBITDA this quarter. Collectively, total Northeast gathering volumes grew 750 Mcf a day or 9% this quarter versus the second quarter of last year, while processing volumes grew 33% and set a new record. The volume growth was predominantly at our JVs in the Bradford Supply Hub, where we benefited from a gathering system expansion on that system in late 2019; and at our Marcellus South supply basin, where we benefited from more productive wells of larger pads. And just to be clear, because we do not operate Blue Racer Midstream, those volumes are not included in our volume statistics.
As a result of this volume growth, though, our EBITDA from our equity method investments improved by a little over $36 million, which also includes the benefit of additional profits that we do receive from Blue Racer Midstream due to the additional ownership we acquired in mid-November last year. Now moving to the West G&P segment. It was down $21 million compared to the prior year. However, remember that first, we did agree to reduce gathering rates in the Haynesville in return for receiving upstream acreage in the South Mansfield area of the Haynesville. Again, as I mentioned, we are not yet seeing the benefit of those upstream assets but we have just named an operating partner to begin developing that acreage. The impact of the gathering rate reduction was about a negative $15 million for the quarter. In addition, in the quarter, we also saw $9 million less EBITDA due to a deficiency fee that One Oak paid us last year related to OPPL, which allowed them to pull volume that they had otherwise submitted to OPPL last year. One Oak does not have that volume obligation to OPPL this year, and therefore, we did not see the deficiency revenue this year.
And finally, we did see a $9 million decline in deferred revenue from our Barnett Shale gathering assets, which is a noncash step-down in revenues. So other than those three negatives, namely the lack of efficiency revenue on OPPL, the Haynesville rate decline and the deferred revenue step-down in the Barnett, our West assets were otherwise up $12 million versus the second quarter of last year. And this is in large part due to higher NGL margins, where once again, in our commodity marketing group is realizing more profit from elevated NGL prices. And while our overall gather volumes in the West were down about 3.5% versus the second quarter of last year, this was more than offset by better gathering rates, where in the Piceance and the Barnett, our contracted gathering rates are influenced by commodity prices. So now moving to year-to-date results. Year-to-date, our results show growth of $230 million of EBITDA or roughly a 9% in EBITDA, driven, of course, by the impact of Winter Storm Uri in the first quarter and by many of the same positive factors that I just mentioned affecting second quarter growth. Combined between our marketing activities and our upstream operations in the Wamsutter, winter storm Uri had a combined positive impact of $77 million.
In addition, our upstream operations otherwise have added an additional $27 million year-to-date. Our Transmission & Gulf of Mexico assets are up $22 million year-to-date or about 2% better, with this increase being driven largely by additional transmission revenues from new projects that have been put into service and incremental revenues from Gulf of Mexico assets, largely due to lower downtime this year versus last year. These positives were partially offset by lower revenues from one less billing day on a regulated transmission pipeline and higher expenses, where, last year, expenses were delayed due -- some due to COVID and because this years expenses, again, are higher due to higher incentive compensation expenses resulting from our strong performance. Our North G&P assets are up $78 million, almost entirely driven by profits from our JV investments, namely from the Bradford Supply Hub gathering system and our Marcellus South gathering systems. In addition, we benefited from the increased ownership of Blue Racer Midstream. In total, gathering volumes for the Northeast are up 10% versus 2020, while processing volumes year-to-date are up 24%. And then finally, the West, West E&P is up $23 million versus the year-to-date last year, and this is on top of the $55 million that we earned from winter storm Uri.
The $23 million increase is driven by higher commodity margins and slightly lower operating costs, offset by lower Barnett deferred revenues, lower Haynesville gathering rates, which were exchanged for upstream acreage, and lower OPPL deficiency revenues that I just mentioned in my 2Q remarks. Otherwise, we did see a 5% gathering volume decline year-to-date, but that again was more than offset by MVCs and higher gathering rates, as again, I mentioned in my second quarter remarks. Again, this is stacking up to be a very good year for us. Ill now turn the call back over to Alan to cover a number of key investor focus areas. Alan?