South Edison, a subsidiary of Edison International (EIX.US), a US utility company, said on Thursday it had received notices from insurers to retain evidence related to the Eaton fire, which is still burning in Los Angeles, but said no fire agencies have indicated the utility was involved.

The company said it had submitted documents to regulators because of "speculation" on the internet that the group's equipment may have been involved.

"To date, no fire agency has indicated that SCE's power facilities were involved in the fire, nor has any agency requested the removal or retention of any SCE equipment," it said.

The utility added that according to its preliminary analysis, no transmission line outages or anomalies were detected until more than an hour after the reported fire time. "Other than the protective notices indicating SCE's possible involvement, and the media's extensive coverage of the fire, we do not believe this event meets the reporting requirements."

The two major wildfires, the 34,000-acre (13,750-hectare) blaze in the Palisades between Santa Monica and Malibu on the west side of the city, and the Eaton fire near Pasadena on the east, have killed 10 people.

The fires have destroyed more than 10,000 homes and other buildings, making them the most destructive in Los Angeles history.

Private forecasting agency AccuWeather estimates losses and economic damage between $135bn and $150bn, suggesting a tough recovery and soaring homeowner insurance costs.