A company that makes devices that supply power to parked aircraft says it is developing a product that can help reduce carbon-dioxide emissions. Tokyo-based AGP says the device runs on lithium batteries. Most other units are powered by diesel.

The company tested the device at Narita Airport on Monday. It was connected to a Boeing 767. Workers opened cargo doors and turned on the cabin lights.

AGP says the mobile unit's batteries can power a parked aircraft for up to an hour and a half. It also can reduce CO2 emissions to a third of what diesel-powered units generate.

The company aims to put the device into practical use around 2024. It is also considering using renewable energy to recharge its batteries.