August 16, 2021

Prioritizing Investments in Critical Transmission and Distribution Infrastructure

Transmission and distribution (T&D) infrastructure serves a critical role transporting electricity from power plants to residential and commercial customers. Without T&D lines, power cannot be delivered, including from wind and solar plants often located hundreds or thousands of miles from urban centers with high electricity demand.

As the owner of one of the largest energy networks in North America, Sempra’s critical investments, primarily focused on T&D infrastructure, are helping to accelerate the energy transition. Today, more than 36 million consumers rely on Sempra and its family of companies to deliver resilient, reliable, and affordable energy every day.

Transmission & Distribution in Top-Tier North American Markets

Sempra’s T&D infrastructure is strategically located in attractive markets which are backed by regulated rates of return or long-term contracted cash flows and help to promote energy access and sustainability. Sempra’s California utilities, San Diego Gas & Electric Co. (SDG&E) and Southern California Gas Co. (SoCalGas), work to provide safe, dependable, and low-carbon energy to 26 million consumers and operate approximately 145,000 miles of T&D lines.

Transmission and Distribution in California and Texas

Transmission and Distribution in California and Texas

Southern California

SoCalGas is utilizing existing infrastructure to support the transmission and distribution of renewable natural gas and to study the application of hydrogen energy. Recently, SoCalGas announced that it will be testing a new technology that can simultaneously separate and compress hydrogen from a blend of hydrogen and natural gas. SoCalGas also recently announced a program to study blending hydrogen into its natural gas pipelines. If approved by regulators, the program would be the first step toward establishing a statewide standard for injecting hydrogen into the natural gas grid.

Our Energy Behind Texas

In Texas, Oncor Electric Delivery Company LLC (Oncor), another Sempra utility, is the largest transmission and distribution electric utility in the state. Oncor owns and operates 139,000 miles of T&D lines, helping connect Texans to the growing supply of renewable energy and helping to make the Lone Star State a leader in solar and wind production. Today, Oncor connects more than 60 renewable generators to the Electric Reliability Council of Texas (ERCOT) grid, capable of generating more than 11,000 MW of electricity. Of this, approximately 10,000 MW is from wind interconnections, representing more than 42% of all ERCOT wind generation.

Investing in the Future

Building a 21st century energy system through critical T&D investments that support hydrogen, renewable natural gas, fuel cells, electric vehicle infrastructure, and carbon capture and storage is key to Sempra’s mission of being North America’s premier energy infrastructure company. We believe these investments in T&D infrastructure will help improve efficiencies and further modernize energy systems by advancing the energy transition and promoting energy diversification, affordability, and access.


1. Amounts are approximate and includes SDG&E and SoCalGas as of 12/31/2020. Distribution lines included in the T+D miles total include distribution and service pipelines.
2. 2019 Data. EIA Net Generation for All Sectors within the United States and for Mexico, BP’s 2020 Statistical Review of World Energy. Includes U.S. and Mexico only.
3. Amounts are approximate and includes 100% of Oncor and Sharyland as of 12/31/2020.