From: UtilityDIVE
Possible threats include physical terrorist attacks on substations, cyber attacks capable of doing physical harm, or large solar storms capable of adding current to the grid. The underlying problem is that the U.S. grid has a limited number of spare large transformers, which are increasingly they are supplied by overseas manufacturers.
A DOE report last year found “key industry sources have identified the limited availability of spare [large power transformers] as a potential issue for critical infrastructure resilience in the United States, and both the public and private sectors have been undertaking a variety of efforts to address this concern.”
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