A growing number of Americans are turning gas-powered vehicles into electric ones by using a process called electric powertrain conversion.

Such conversions are becoming more popular as battery technology gets better and the world turns toward cleaner energy sources.

Kevin Erickson owns a 1972 Plymouth Satellite that he renamed ”Electrollite” after conversion. Now, the car can go from a still position to 97 kilometres per hour in about three seconds. Its top speed is almost 250 kilometres per hour.

At the end of 2019, Erickson bought the car for $6,500. He then began a year-and-a-half-long project to convert the car to electric. He used battery packs, a motor and parts from a Tesla Model S that had been in a crash.

“This was my way of taking the car that I like — my favourite body — and then taking the modern technology and performance, and mixing them together,” said Erickson, who has put about $60,000 into the project.

Jonathan Klinger is vice president of car culture for Hagerty Insurance. He said converting classic cars into EVs is “definitely a trend,” although research on the activity is limited.

In May, the Michigan-based company did a web-based study of about 25,000 automobile lovers in the United States, Canada and the United Kingdom.

About one percent had at least partly converted an older model car to run on some form of electric power.

The top three reasons for converting the vehicles were for better performance, for a fun project, and because of environmental concerns. About 25 per cent of respondents said they approve of older automobiles being partly or fully converted to electric vehicles.

Klinger, who owns several vintage vehicles, said he does not think electric motors will replace all gas engines — especially when considering historically important vehicles.

“There’s something satisfying about having a vintage car that has a carburettor,” he said because it’s the same as when the car was new. Some car lovers want to keep the sound of older cars’ original engines.

Electric conversions require special knowledge to complete. They also involve safety concerns and parts that are sometimes hard to find.

And then there is the price.

Sean Moudry, who co-owns Inspire EV, a small conversion business near Denver, recently worked on a 1965 Ford Mustang. The year-and-a-half-long project cost more than $100,000 and involved many difficulties.

Moudry and his partners replaced the gas engine with a motor from a crashed Tesla Model S. They also added 16 Tesla battery packs weighing a total of about 363 kilograms.

Most older cars, including the Mustang, were not designed to have that much weight or the increased performance of a powerful electric motor. So, the team had to make changes to other parts of the car, including the suspension system.

Moudry says many people do not have the resources necessary to carry out this kind of project. As a result, he says, it will take a while for electric conversions to become common.

“I think it’s going to be 20 years,” he said. “It’s going to be a 20-year run before you go to a car show and 50 to 60 percent of the cars are running some variant of an electric motor in it.”

But that reality could be coming sooner than expected, says Mike Spagnola, president and CEO of the Specialty Equipment Market Association (SEMA), a trade group.

He said that electric vehicle products took about 1950 square meters of marketing space at SEMA’s yearly show in Las Vegas this fall. That was up from only 232 square meters at the 2021 show.