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  1. Market Data
September 7, 2021

San Miguel Substation, US

By Carmen

San Miguel Substation is a 345kV substation located in San Miguel, California, US.

The San Miguel Substation project’s construction has begun in 2019. The works are expected to be commissioned in 2021.


San Miguel Substation project, which is an upgrade substation, will be operated by South Texas Electric Cooperative.

The designed voltage level of the substation is 345/138kV and the operating voltage level is 345/138kV.

The step-in voltage of the project is 345kV and the step-out voltage is 138kV. Upon completion, the substation will have a capacity of 1200MVA.

San Miguel Substation project development status

The development of the San Miguel Substation project was approved by California Public Utilities Commission in 2019. The project is expected to be commissioned in 2021.

About South Texas Electric Cooperative

South Texas Electric Cooperative Inc (STEC) is an electricity generation and transmission cooperative. The cooperative business include power supply, power delivery, finance and accounting, and corporate and member services. It owns and manages wide spread transmission network of high-voltage transmission lines. STEC’ electricity generation portfolio includes wind, lignite, hydroelectric, natural gas, and diesel fuel. The cooperative also provides technical services such as SCADA equipment, protective relays, breaker and recloser controls, microwave radio and fiber optic communications facilities, regulator and transformer controls, and other control house and substation facilities.


All publicly-announced T&D Line & Substation projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects is sourced through secondary information sources such as country specific utility players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.

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