Our long-term preparation has included the installation of heat tracing on our pipeline systems and at our processing plants to keep piping and internal fluids above freezing point. We also know that it takes considerable investments to maintain one of the largest systems in the industry. And over the past three years, we have spent approximately $1.5 billion for maintenance related to our assets with approximately half of that spent on our Texas assets.
Going back to 2014, we have been investing in and developing a dry gas fuel system in West Texas, which provides a reliable fuel source to our compressors, while preventing freezing. In the days leading up to the storm, we injected additional natural gas into our pipelines, as line pack, prior to the storm that not only served as additional storage, but also allowed us to place natural gas volumes as close to our customers as possible.
And we brought in specialized equipment that was strategically allocated across our systems to help prevent freezing, including hot starts for engines, steam trucks, steam generators, and methanol injection units. Our employees, including operations personnel and mechanics were deployed to key assets and to those facilities at greatest risk during freezing operating conditions. This included more than 25 facilities on our pipelines and more than 25 processing plants across Texas. These key facilities were manned 24 hours a day from February 13 through the 18, which resulted in approximately 50,000 hours of overtime work by our employees.
This pre-deployment preparation allowed us to resolve and prevent most operational issues once the storm arrived. To manage through the storm, we did everything within our control to keep our plants running and circulating fluids and field compression idling, so that we were prepared to deliver gas to customers as soon the volumes returned to our facilities.
We utilized our Texas storage facilities, where we have 63 Bcf of working storage capacity. Withdrawals from these facilities reached a peak rate of approximately 1.7 Bcf during the storm. Additionally, we did everything we could to purchase and or transport natural gas from other areas, including bringing gas in from out of state for delivery to our customers.
We conserved power everywhere we could, including facilities like Mont Belvieu, where we reduced power by shutting down our fractionators. And we also switched from electric to gas on our dual drive compressor units, leaving in excess of approximately 200-megawatts per hour on the grid.
This storm highlighted and emphasized the importance of having reliable, flexible assets and an experienced operations team. I’ve said it before, but we truly believe our operations team is second to none and their efforts during the Winter Storm Uri were extraordinary. In a year where we celebrate our 25th anniversary, we had a history of reliable service through multiple extreme adverse weather events and our performance this time was no exception. Not a surprise here, but we now have opportunities to lock in longer term contracts for storage and firm transportation capacity.
Switching gears to an update on the acquisition of Enable Midstream Partners, which we expect will provide increased scale in the Mid-Con and Ark-La-Tex regions and improved connectivity for our natural gas and NGL transportation businesses.
On April 7, the SEC declared the Registration Statement on Form S-4 effective. And on April 12th, the two largest Enable unitholders, CenterPoint and OG&E, delivered written consents to approve the merger, which is sufficient to approve the transaction. The transaction is subject to HSR and other customary closing conditions. The combination of Energy Transfer’s and Enable’s complementary assets will allow the new larger company to provide superior, flexible and competitive service to our customers as we pursue additional commercial opportunities. The combined company also expects to achieve significant cost savings, while enhancing our ability to serve customers.