The lawsuit alleges gross negligence by the power grid operator and the electricity provider, saying it led to the death of 11-year-old Christian Pavon.
The boy died Tuesday after spending the night in his frigid mobile home that lost power.
The lawsuit says Christian died of hypothermia, and the family is asking for more than $100 million in damages.
Medical examiners have not yet released his cause of death.
Entergy released the following statement on the lawsuit:
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