Metropolitan Series by Walter Jon Williams

Aiah has learned that plasm is more than an energy source. It resonates within the human mind, giving power to heal and to kill. So when she finds an undiscovered, unlimited supply, she dares to meet with the powerful Metropolitan known as Constantine, a mysterious rebel with plans. Together they can use the plasm to rally forces to overthrow the government.

In a mind-bending odyssey through a world rife with tyranny, a rebel group schemes to harness a radical new energy source--plasm.