Sheridan C. Swords
Executive Vice President, Commercial Liquids and Natural Gas Gathering and Processing at ONEOK
Thank you, Walt. Beginning with the natural gas liquids segment. Volume growth from the Rocky Mountain and Mid-Continent regions of 17% and 16%, respectively, compared with the first quarter 2024 drove higher earnings in the second quarter. Rocky Mountain region growth was primarily from increased propane plus volume, with higher incentivized ethane also contributing. The Mid-Continent saw more ethane recovery compared with the first quarter, as well as contributions from overall NGL growth sequentially. In the Permian Basin, we had higher volumes committed short term in the second quarter of 2023 and the first quarter of 2024 than in the second quarter 2024. We since recontracted much of that capacity with the volumes committed for longer terms.
We continue to see opportunities to recover ethane across our system. Favorable ethane economics will continue to depend on natural gas values and ethane demand at petrochemical facilities. Dynamics through the remainder of the year could provide a tailwind to our modest ethane recovery assumptions and guidance. We've made significant construction progress on our capital growth projects, and now expect the West Texas NGL pipeline expansion and our MB-6 fractionator to be in service by the end of 2024. Our previous in-service estimates were the first quarter 2025 for both projects. On the West Texas NGL expansion, the full pipeline looping providing a capacity of 500,000 barrels per day is expected by year-end, with a few remaining pump stations to be completed to get to the full capacity of 740,000 barrels per day.
The Elk Creek pipeline expansion remains on track for the first quarter 2025 completion. Additionally, today, with our expanding need for fractionation capacity, we are announcing a project to rebuild our 210,000 barrels per day NGL fractionator in Medford, Oklahoma. The project is expected to cost approximately $385 million and be completed in two phases, with the first expected to be completed in the fourth quarter of 2026 and the second phase in the first quarter of 2027. Rebuilding at Medford provides a number of strategic benefits. It is the lowest cost per barrel expansion option for ONEOK to help address the expected increase in NGL production. Its location in the Mid-Continent will further increase the reliability and resiliency of ONEOK's fractionation capabilities and will allow our integrated system to accommodate volume growth from the Permian, Bakken and Mid-Continent.
The Medford fractionator will also produce additional butane and natural gasoline for incremental refined products and delivering blending opportunities in the Mid-Continent. As Pierce mentioned, we recently completed a strategic acquisition of NGL assets from Easton Energy in the Houston area. These assets will provide connectivity between our NGL and refined product systems and with key customers in the area. The acquisition came with associated earnings from existing volumes, and we expect to fill the additional capacity of this system, providing a very attractive return on the project through committed volumes we control. In addition to tariff earnings on the system, we also expect the acquisition to accelerate our commercial synergy opportunities primarily related to blending.
The close proximity of our NGL and refined products terminals to major refiners in the Houston area and now improved connectivity presents considerable opportunities to capture value downstream of our fractionation assets. We expect to complete connections from the legacy Houston asset to our Houston-based assets beginning in mid-2025 through the year-end 2025. Moving on to the refined products and crude segment. Gasoline and jet demand was strong in the second quarter, supported by the beginning of a robust summer travel season. As it relates to marketing and optimization, we were able to optimize our assets through forward sales to capture higher margins on our liquids blending activity. As Pierce mentioned, we recently announced the expansion of our refined products pipeline system from Kansas to the greater Denver area, including an additional direct connection with the Denver International Airport.
Total system capacity will increase by 35,000 barrels per day, with low-cost expansion opportunities available as demand continues to grow in these markets. Following a successful open season, the additional capacity is fully subscribed. The project is expected to cost approximately $480 million and be completed in mid-2026. Moving on to the natural gas gathering and processing segment. Rocky Mountain region processing volumes increased 10% year-over-year, averaging a record of more than 1.6 Bcf per day during the quarter. There are currently 40 rigs in the Williston Basin with more than 20 on our dedicated acreage. As we look to the remainder of the year, we are reaffirming our volume guidance due to the benefits we're seeing from the drilling of longer laterals and higher well performance on traditional laterals without the need for as many well connects.
In the Mid-Continent region, we are currently seeing 35 rigs in Oklahoma, with six operating on our acreage. With current commodity prices, we expect producers to continue concentrating activity in the oilier and NGL-rich region -- areas in the region. And as natural gas prices strengthen towards the remainder of the year, we could see rig activity increase in the gassier regions. In the natural gas pipelines segment, we benefited from higher firm and interruptible transportation rates in the second quarter. The demand for natural gas storage remains high.
Progress continues to be made on our current expansion projects in Texas and Oklahoma, which we both have -- which both have firm contracts extending beyond 2030. In the second quarter, we completed two Bcf of the Texas project and expect the remaining one Bcf to be in service next month. Our Oklahoma project is expected to be completed in the second quarter of 2025.
Pierce, that concludes my remarks.