General Motors is hitting the accelerator on its drive towards electric autos, significantly boosting its near-term investments as it unveils new models and builds production capacity.

The biggest US automaker announced it will raise spending by 30 per cent to $35 billion through 2025 and plans to build two additional battery cell plants. Some of the funds also will go to its autonomous vehicle programme.

The company cited strong consumer reception to its early electric vehicle (EV) models and beneficial public policies as factors that give it confidence the investment will pay off.

"GM is targeting annual global EV sales of more than 1 million by 2025, and we are increasing our investment to scale faster because we see momentum building in the United States for electrification, along with customer demand for our product portfolio," said Chief Executive Mary Barra.

"There is a strong and growing conviction among our employees, customers, dealers, suppliers, unions and investors, as well as policymakers, that electric vehicles and self-driving technology are the keys to a cleaner, safer world for all."

The announcement marks the latest vote of confidence in an EV future by a legacy automaker in the wake of the ascent of Tesla and as governments embrace policies to address climate change. 

Just last month, Ford won praise for its unveiling of the all-electric F-150 pickup truck and said it was targeting 40 per cent of its volume by 2030 to be comprised of EVs.

As the auto giants have deepened their commitment to EVs, startups have hit speed-bumps. Earlier this week, Lordstown Motors announced the resignations of its chief executive and chief financial officer after an investigation concluded some of the company's statements about auto pre-orders were inaccurate.

That followed an announcement the company did not have enough cash to begin commercial production.

GM's current fleet of autos still overwhelmingly consists of vehicles with internal combustion engines, and the Bolt is the only EV model in showrooms.

But the company has announced EV versions of many of its most popular vehicles such as the Silverado pickup truck.

A reboot of the "Hummer" truck will launch this fall, when the company also begin taking reservations for the Cadillac Lyriq sport utility vehicle, a GM spokesman said.

Chief Financial Officer Paul Jacobson said the increase in spending was a "prudent" investment in light of consumer enthusiasm at models it has presented so far. The company expects 30 new EV models by 2025, with about two-thirds available in North America, he said.

"We've got to make sure that we're continuing to invest in battery technology and getting into high-volume EVs to keep bringing the cost down," he said.

GM has announced numerous steps on EVs since the November election of President Joe Biden, who has championed electric autos as a component of the strategy to mitigate climate change.

Shortly after the election, GM boosted its planned spending for EVs and autonomous vehicle technology by $7 billion from $20 billion.

Also in November, the company withdrew from a challenge to California's fuel economy rules backed by former president Donald Trump's administration, and in January said it aimed to eliminate tailpipe emissions from new light-duty vehicles by 2035.

The automaker in April announced it was building a $2.3 billion battery cell plant with LG in Tennessee, similar to one now under construction in Ohio.

Specifics on the two additional battery cell plants will be announced later, GM said.

In addition to the budget announcement, GM also lifted its financial forecast for the second quarter. The company now expects operating earnings for the first half of 2021 of between $8.5 billion and $9.5 billion, above the $5.5 billion previously projected.

Jacobson said GM was able to "pull forward" some semiconductors despite a supply crunch, however, the company "remains cautious" on its full-year earnings outlook.

Shares of GM rose 2.5 per cent to $62.31 in late-morning trading.