Karen Sedgwick
Executive Vice President and Chief Financial Officer at Sempra
Thank you, Jeff. We've previously said that 2024 will be an important year of execution at each of our growth platforms, and I'm excited to provide an update on our progress.
At Sempra California, we continue to see constructive regulatory outcomes. In March, the CPUC issued a proposed decision supporting the updated return on equity that was implemented this year as part of the CCM trigger. The commission agreed that the current cost of capital mechanism operated as designed and the recently established returns on equity at SDG&E of 10.65% and at SoCalGas of 10.5% should remain in place through 2025 unless market conditions result in a trigger. Importantly, this improves regulatory certainty by affirming the protection that the CCM provides to customers and shareholders. And the key takeaway is that this is another constructive data point for California's regulatory framework.
Another example of this is rate reform. Improving affordability for all of our utility customers is a top priority, and I'm pleased to share that a proposed decision was issued at the CPUC in March to implement a fixed charge for residential electric customers. As currently proposed, this would reduce volumetric rates, support a more fair rate structure and help California meet its clean energy goals. A final decision is expected in the second quarter of 2024, and the fixed charge would then be expected to begin in the fourth quarter of 2025.
During the quarter, we also made a joint filing with the other California utilities to develop projects that successfully demonstrate blending hydrogen into the natural gas system. These projects will begin blending at up to 5% on isolated sections of the natural gas system and incrementally increase the hydrogen concentration based on safety and technical feasibility. Hydrogen blending has been demonstrated safely and reliably around the world for decades, and we look forward to working with our partners to support new and improved ways to expand decarbonization efforts here in the state.
Turning to the GRC. We expect a proposed decision in the second quarter and a final decision this year. Once a final decision is obtained, it will be retroactive to the beginning of the year. As a reminder, after we receive a final decision, we will have a clear regulatory pathway for execution on our utility-focused capital plan through 2027.
Lastly, Cal-ISO updated SDG&E that it was not selected to move forward on the Imperial Valley transmission line and substation. It's important to note that we were financially disciplined in how we developed our bid and we look forward to supporting the project's successful development as well as building the other transmission projects that were directly awarded to SDG&E by Cal-ISO.
Turning to Texas. We continue to see significant growth across Oncor service territory. Just last month, ERCOT issued an updated transmission planning report, forecasting approximately 40% higher load in '23 than in last year's report. And yesterday, Oncor made its inaugural SRP filing, which includes approximately $3 billion of capital investments. In addition to SRP, the 2023 legislative session was particularly constructive for the state's utilities. We're already seeing the positive impacts at Oncor in terms of the planning and execution that support the state's priorities and improve the timing of the Company's returns on capital.
Moving to Sempra Infrastructure, we're very excited about the opportunity to help deliver cleaner energy to our customers and partners. Recently, we declared a positive FID at our Cimarron wind expansion project. This project demonstrates our ability to generate attractive returns, while utilizing existing Company-owned transmission capacity to serve California markets and targeting O&M efficiencies based on locational advantages. Additionally, we're making great progress at ECA LNG Phase 1 and Port Arthur LNG Phase 1. ECA is roughly 80% complete and remains on-target to start commercial operations in the summer of 2025. Port Arthur also remains on schedule with significant ongoing construction activity, including excellent progress around soil stabilization, new foundations and the commencement of concrete pouring and structural steel work.
Turning to our marketing efforts. The LNG market is long-term by nature, and while the DOE pause has received a lot of press, we remain confident in our ability to deliver projects that offer a long-term, secure and cleaner energy to customers. Sempra Infrastructure benefits from experienced project development teams that continue to make progress on critical work streams, including permitting, engineering and commercial negotiations. Moreover, the reference pause has not impact our confidence in the overall competitive positioning of our development projects, and we're strategically utilizing this time to steadily advance our opportunities.
Also of note, even if you only take into consideration projects that have reached FID, Sempra Infrastructure has incredible built-in growth. With 16 million tons per annum of LNG export facilities, associated infrastructure and a new wind project under-construction, we're improving visibility to attractive earnings growth through the end of our planning period in 2028. And that's all before taking into account our development project pipeline, which Jeff referenced earlier and offers notable upside.
We can now turn to the next slide, where Allen will discuss ERCOT's new planning processes.