This is The Guardian.

We're on the roof of a Tesco Extra store in Lincoln.

We've got Lincoln Cathedral.

And then a sea of solar panels everywhere you look.

What are these doing?

So the solar panels are actually powering 20% off the store that we're standing on top of.

Tesco aims to be net zero across its own operations by 2035.

To find out how it plans to get there, visit Theguardian.com forward slash Tesco sustainability.

This message was paid for by Tesco.

The audio long read is supported by EDF, Britain's biggest generator of zero carbon electricity.

At EDF, they're not just generating zero carbon electricity, they're helping you save cash and carbon. Take EDF's Sunday Save a Challenge. Shift your weekday peak usage by 40%,

and you could earn up to 16 hours of free electricity to use the following Sunday. And when you install solar panels

and a battery with EDF, you could pay zero for your electricity. EDF is leading the charge

in zero carbon electricity. They generate more British wind, nuclear and solar electricity than anyone else.

And if you drive an EV, you can charge it overnight for under £10.

Ready to save cash and carbon?

Remember, changes in our power.

To find out how EDF are helping their customers save cash and carbon,

visit edfenergy.com.

Welcome to The Guardian Long Read, showcasing the best long-form journalism covering culture, politics and new thinking.

For the text version of this and all our long reads, go to the Guardian.com forward slash long read.

This article contains some swearing.

...