How the Lights Stay On

Author’s Note

This book is for anyone — kid, teenager, or curious adult — who has ever wondered how electricity actually works, and has been frustrated by the fact that most explanations stop right where it starts to get interesting.

It is also a book for people who do not yet know they want to understand the electricity grid, but who suspect they should. The grid is one of the most consequential machines humans have ever built. The lights coming on when you flip a switch is the result of an extraordinary amount of work — engineering, planning, regulation, labor, judgment — most of which is invisible. We do not, generally, teach kids how the grid works, even though they will spend their entire lives depending on it. This book is my attempt to fix that for the people who pick it up.

The book is honest about trade-offs. There is a kind of energy writing for young readers that frames the world as good guys versus bad guys — clean energy good, fossil fuels bad, certain politicians wise and others reckless. That is not the kind of writing I have tried to do. Every choice in the grid is a trade-off between things people genuinely want. Cheaper electricity often means dirtier electricity, or less reliable electricity, or both. Cleaner electricity often means more expensive electricity, or trickier intermittency problems, or both. There is no electricity system in the world that has solved all of these problems at once. I have tried to tell you about the trade-offs honestly, without picking a side. You are old enough — and smart enough — to pick your own side.

The book is also honest about what it does not know. The energy transition is unfolding while I write this. Some facts in this book — the status of a particular policy, the deployment count of a particular technology, the latest decision from a state regulator — will be out of date by the time you read it. I have tried to be careful with these facts and to flag the places where things are changing fast. The framework should hold up. The framework, in fact, is the most important thing this book is trying to give you.

If you are reading this in middle school or high school, some of the choices being made right now about the grid will not be felt fully until you are an adult. You will inherit the grid that today’s adults are building. You will also, eventually, build the grid for the next generation. The book ends with a list of unsolved problems that I genuinely think some of you will spend your careers on. If that turns out to be true, I will consider the book to have done its job.

A few practical notes.

The book is structured to be read in order, because each chapter builds on the ones before it. But chapters can also be read individually if you are curious about a specific topic. Each chapter is roughly self-contained, with references back to earlier chapters where they matter.

There are no exercises, no quizzes, no questions at the end of each chapter. This is not a textbook. It is a book.

If you find errors — and you will — I would love to know about them. The grid is changing too fast for any one book to keep up.

I hope you enjoy it.

Now go meet the Blink.

All 18 chapters of How the Lights Stay On · Library · All courses