Transformer explosion at Entergy substation cuts power to Shell Convent Refinery, Louisiana

A transformer owned by Shell exploded at an Entergy substation near the Shell Convent Refinery (Motiva plant) in St. James Parish, Louisiana, causing an electrical fire on the evening of 26 September 2017. The substation was the main electrical feed for the refinery, and the explosion caused the plant to lose power, triggering an uncontrolled shutdown. Crews responded and the fire was quickly brought under control. Shell said it had activated its emergency response plan and deployed personnel to the site, that all site personnel were accounted for and that there were no injuries. The parish sheriff's office reported no injuries and no off-site impact. Shell's statement said the community would notice elevated flaring during the process. Entergy and Shell said they were investigating the cause of the transformer failure. Residents in the surrounding area reported seeing a bright greenish light in the sky at the time of the explosion.

The specific technical cause of the transformer failure was not reported. An investigation by Entergy and Shell was announced but no findings were disclosed in this report.

1. Loss of a single substation transformer can force an uncontrolled shutdown at a major industrial site, which shows the value of resilient or redundant grid connections for critical facilities.
2. Prompt activation of emergency response plans and personnel accountability procedures helps avoid injuries during unplanned electrical events.
3. Early public communication about expected effects, such as elevated flaring during an unplanned shutdown, helps manage community concern.

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