It’s been a headache-inducing nexus of active regulation, distributed energy and environmentalism for some electric utilities. Plunging costs of solar power and growing concerns of climate change are inspiring swelling ranks of the largest private and Fortune 500 companies pursuing not only aggressive renewable energy goals for sustainability purposes but also cost effectiveness and resiliency. Now utilities are facing the sobering question of whether to significantly invest in green infrastructure to keep these large customers and risk controversial rate cases, or watch helplessly as that caravan of large, rate-paying customers defects, taking considerable revenue with them.