General Motors Co was set to unveil Monday its next-generation Chevrolet Volt plug-in hybrid and expected to restate a commitment to build an affordable long-range electric car, doubling down in a segment with scant sales and even skimpier profits.

Electric cars and plug-ins like the Volt account for less than 1 percent of the global vehicle market, and falling oil prices are widening the cost gap between electrified cars and petroleum-fueled internal combustion engine vehicles.

GM's current Volt has sold well below initial company projections and is a money loser, analysts say.

The company doesn't disclose profits by model line.

Fiat Chrysler Automobiles CEO Sergio Marchionne in May 2014 asked consumers to steer clear of his company's Fiat 500e.

"I hope you don't buy it because every time I sell one it costs me $14,000," he said.

Still, GM and its major rivals persist in their efforts because without "zero-emission" vehicles and ultra-high mileage hybrids, they could fall short of meeting government demands to more than double fuel efficiency by 2025.

In addition, California has set its own quotas for zero-emission vehicle sales, and China is pushing the industry for more battery-powered vehicles.

"We're in for the long haul," GM CEO Mary Barra told reporters Thursday at the company's downtown Detroit headquarters. "I'm very excited about the new Volt."

Steve Marjoros, director of Chevy car marketing, said GM will spend more to market the new car, which will launch in the second half of the year. GM did not say how much the new Volt will cost.

Forecaster LMC Automotive expects US sales of EVs and plug-in hybrids to almost triple to more than 339,000 in 2020 from 2014. But that's still fewer sales - from dozens of competing battery-powered models - than Toyota Motor Corp realizes in a year from sales of its Camry or Ford Motor Co from its F-150 pickup truck.

Barclays only sees the global share of such vehicles hitting about 3 percent by the end of the decade. "The driver at this point would be more regulatory push than consumer pull," Barclays analyst Brian Johnson said.

GM will get competition from Tesla Motors Inc, which is building a $5 billion electric battery plant in Nevada.

German luxury-car maker BMW has spent almost $3 billion to develop its i-Series of electric cars.