Adrian Tchaikovsky 
Firewalkers [EPUB ebook] 

Firewalkers Are Brave.Firewalkers Are Resourceful.Firewalkers Are Expendable.The Earth is burning. Nothing can survive at the Anchor; not without water and power. But the ultra-rich, waiting for their ride off the dying Earth? They can buy water. And thanks to their investment, the sun can provide power.But someone has to repair the solar panels when they fail, down in the deserts below.Kids like Mao, and Lupe, and Hotep; kids with brains and guts but no hope.The Firewalkers.