Three cars were incinerated and one was damaged by a fire in a yard outside of the Hetch Hetchy Water and Power Moccasin Dam’s paint and electrical shops early Tuesday morning.

The fire was contained to the parking lot and did not prompt evacuations or disruption of normal system operations at the power plant, Betsy Lauppe Rhodes, Hetch Hetchy Regional Communications Manager said.

Just after 5 a.m., a Moccasin resident heard an explosion and called 911, Rhodes said.

Tuolumne County Fire investigator Stephen Gregory said one of the cars, a 2012 Ford F150 service vehicle, burst into flames, with the fire spreading to the adjacent vehicles a 2005 Chevrolet 1500 service vehicle and a 2002 Ford E350 service van.

The explosion heard by the resident may have been from aerosol paint cans inside the car where the fire originated, he said.

Gregory said there was no indication as to where the fire started inside the vehicle, and the cause remained under investigation.

During the fire, a fourth service truck, a 2006 Chevrolet 3500 was damaged. The vehicles were parked about 50 feet from the paint and electric shops.

Cal Fire Public Information Officer Emily Kilgore said there was no threat to structures on the property during the fire. First response units were contacted about the fire at 5:15 a.m., contained the fire by 5:37 a.m. and had the fire completely controlled by 8:48 a.m., she said.

Many follow-up units were canceled after the initial response, which included at least one fire engine and one fire truck.

No injuries were reported, she added.

Cal Fire also dealt with a 2-acre vegetation fire about noon Tuesday 2 miles east of Pine Mountain Lake on Ferretti Road near Pine Mountain Drive in Groveland.

No structures were threatened, and it was quickly contained, she said.

Two engines and one hand crew responded to the fire.

The cause is still under investigation.

Contact Giuseppe Ricapito at (209) 588-4526 or . Follow him on Twitter @gsepinsonora.

Maggie Beck contributed to this report.