BorgWarner Inc. agreed to acquire Delphi Technologies Plc for about $1.5 billion in an all-stock deal that unites two auto suppliers positioning for the industry’s transformational shift to hybrid and electric vehicles.

Delphi Technologies stockholders will receive 0.4534 BorgWarner shares for each Delphi Technologies share held, according to a statement Tuesday. That would represent a premium of about 77% to Delphi Technologies’ closing price Monday.

BorgWarner stockholders would own about 84% of the combined company, while current Delphi Technologies owners would hold 16%. The deal values Delphi Technologies at about $3.3 billion including debt, according to the statement. The companies see cost savings of about $125 million by 2023, they said.

The announcement by BorgWarner confirmed an earlier report by Bloomberg News. The deal is the Auburn Hills, Michigan-based company’s biggest acquisition to date, surpassing its purchase of Remy International Inc. for about $950 million in 2015, according to data compiled by Bloomberg.

Delphi Technologies advanced as much as 64% to $16.05 in pre-market New York trading, while BorgWarner slumped as much as 8.5% to $35.10.

Both companies’ engine and transmission businesses are seen by analysts as entering a period of decline as carmakers consolidate and invest in the development of electric cars. They’ve been investing in products automakers will need for hybrid models that use both gasoline engines and battery power, as well as fully electric vehicles.

“This could be the beginning of powertrain consolidation, which is coming out of necessity,” Chris McNally, an analyst with Evercore ISI, said before the announcement. “All the suppliers are dealing with lower global volumes combined with the transition towards electric vehicles, which requires heavy investment.”

Forced by governments around the world to improve fuel efficiency and cut emissions, automakers are turning to smaller, lighter engines and electrifying their lineups. The industry has also been hit by sluggish economic growth and the U.S. trade war with China.

Delphi Technologies, based in Gillingham, England, was one of two companies to split from Delphi Automotive in 2017. The other was Aptiv Plc, focused on new technology like advanced safety systems and self-driving car software. The split left the smaller Delphi Technologies to focus on supplying engine and transmission parts.

Delphi was the world’s largest parts maker when General Motors spun off the company.