The largest risk is to large transformers which operate the HV part of the grid. Many large transformers in the US are 40+ years old, already well beyond their 25-year design lifecycle.
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Manufacturing capability in the world for EHV-class transformers continues to be limited relative to present market demand for these devices. Further, manufacturers would be unable to rapidly supply the large number of replacement transformers needed should the U.S. or other power grids suffer a major catastrophic loss of EHV Transformers.
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Manufacturers presently have a backlog of nearly 3 years for all EHV transformers (230 kV and above).
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Only one plant exists in the U.S. capable of manufacturing a transformer up to 345 kV. No manufacturing capability exists in the U.S. at present for 500 kV and 765 kV transformers, which represent the largest group of At-Risk transformers in the U.S.