Intel and IBM have been praised for their work on green computing at the West Coast Green conference in San Francisco.
The companies were the first mainstream computing vendors to be invited to the show, which highlights advances in green methods and design.
"Intel and IBM are changing the game," said Douglas Green, conference moderator and founder of Green Design Furniture.
"They are the first tech companies to really step into the green technology space like this. It's the kind of behaviour you'd expect from startups, not from some of the biggest names in the industry."
Doug Davis, vice president of Intel's Architecture Group, used his opening keynote to explain how Intel is pushing for a greener agenda.
The company is the largest private buyer of green energy in the US, he claimed, and had been reconfiguring its manufacturing processes to reduce power and water use, and is recycling silicon wafers for use in the solar power industry.
Intel has made a percentage of employees' annual performance bonuses, from the chief executive down, reliant on a reduction in the firm's overall carbon footprint. Intel Capital is also investing heavily in green technology, Davis said.
A particular focus for Intel is building smarter electric cars, and the responsive power systems to charge them, with Atom processors providing the control systems.
"Our systems will allow the car to become a smart device connected to the network," said Davis.
IBM, meanwhile, used the show to unveil technology for managing power systems in smart buildings.
The company's latest sustainability management system allows building administrators to be much more efficient in energy use by using smart sensors that adjust power output to suit conditions.
Voice assistants in smart homes will reach 275 million in five years' time, and Amazon is in pole position
Kicking Palantir off of AWS is among their demands, too
Rafaela Vasquez was watching The Voice at the time of the crash, new evidence shows
PUBG price slashed on Steam after selling more than 50 million copies - as daily player numbers plunge