In the past 20 years, the price of solar panels has fallen by more than 97 percent. This extraordinary decline is good news for the world – and it’s transforming the way energy is produced and consumed.

For the next few episodes, we’ll be talking to people who are in the middle of this solar power revolution to find out how it happened, and what it will mean for the world.

Today, Jenny Chase, the author of Solar Power Finance Without the Jargon, tells the story of how solar power got so cheap and where it’s exploding today, and she explains what problems we still need to solve to pull off a worldwide energy transition.