The Reclaimer - The Wind Merchant, #2

At best, the plan was ill-advised, hastily crafted, and short sighted. It had to work. The Collective has been shattered, but at a cost. The dread sky pirate India Bravo has taken control of Atmo city fuel supplies, threatening to let entire populations plummet to their deaths if her demands aren't met, and she wants Ras Veir. Among balancing his budding romance with Callie Tourbillon, living in his father's shadow, and leading his new crew aboard The Kingfisher, Ras must hunt down every deadly Energy Convergence to clear a path for Atmo's safe landing before it's too late.
But the survivors of the world below have plans of their own, and the ghosts of The Clockwork War whisper that there is more than just Energy in the wind.