Bosses of UK energy distribution firms have been accused of "complacency" as they defended their response to storms that led to power cuts over Christmas.
About 750,000 properties were affected, and many left without power for days.
UK Power Networks' Basil Scarsella said "tried and tested" plans struggled to cope in worse-than-forecast weather.
But Commons Energy Select Committee chairman Tim Yeo said there seemed to be a lack of any "expression of real concern" by firms for those affected.
After the first 45 minutes of the hearing, Mr Yeo told the bosses that the "tone of this conversation and its contents has been utter complacency".
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