The U.S. Department of Energy’s (DOE) Office of Electricity (OE) has released a new report focusing on the future of distribution transformers in the nation’s electrical grid. The report, produced in collaboration with the National Renewable Energy Laboratory (NREL), outlines the current state of distribution transformers, their age profile, and factors driving increasing demand for these critical grid assets.
Distribution transformers play a vital role in the U.S. electrical power grid by stepping down voltage from higher power lines to levels safe for consumer use. They serve a wide range of sectors, including residential, commercial, industrial, and data centers. As electricity demand in the U.S. grows, the need for more distribution transformers is expected to rise.
The report identifies three primary drivers of increasing demand: the replacement of transformers that fail, the number of transformers reaching the end of their operational life, and the growing demand from new customers. In addition, the study highlights how sectors like data centers, electric vehicles (EVs) and charging stations, and renewable energy generation contribute to the rising need for transformers. The report also touches on the growing demand for “step-up” transformers, which have similar characteristics to distribution transformers.
Michael Pesin, Deputy Assistant Secretary for Grid Systems and Components at OE, emphasized the importance of understanding transformer operations to develop strategies for the 21st-century grid. “This report will help us understand the differences in transformers used by power companies and how they will need to function to advance the grid,” Pesin stated.
The study also found that a significant portion of transformers—about 55 percent—are older than 33 years. Researchers warned that the increased demand on these aging transformers could accelerate their failure rate, highlighting the urgency of addressing infrastructure needs as electricity consumption continues to rise.
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