PWR

Quanta Services, Inc.

One of the world's largest builders of electric-grid and utility infrastructure, Quanta designs and repairs power lines, substations, renewable-energy projects, and the electrical systems that keep data centers and semiconductor plants running. It traces back to 1997, when veteran John Colson merged four regional electrical contractors—including PAR, where he'd started as a survey stakes carrier—into one national company. The name borrows from physics' "quantum," the smallest unit of energy, nodding to the essential building blocks of modern power.