The Chinese battery maker that has the US worried

The world's two superpowers are so intricately linked that it's hard to think of a pillar of the economy that hasn't been strained by tensions between the US and China.

- Amy Hawkins

And the next frontline in the economic conflict may be the most fundamental yet: a fight for power itself.

A Chinese company that most people have never heard of is at the heart of the global race to store the clean energy needed to power the green transition in the US and the rest of the world.

China's Contemporary Amperex Technology Co Limited, or CATL, is an energy storage specialist that is the world's largest battery maker for electric vehicles (EVs). But despite the fact that the company controls nearly two-fifths of the world's EV battery market - and has powered cars made by brands including Tesla, Volkswagen and BMW-it has long flown under the radar of US politics. Until now.

In February, Duke Energy, a US energy company that serves more than 8 million customers, said it was phasing out the use of CATL batteries. Duke said it would replace the CATL products with technology from a "domestic or allied nation supplier".