The Seattle-based issues-and-advocacy practice of ad giant DDB Bass & Howe has an award-winning public service announcement for energy conservation. The spot won an Emmy!
Some time ago, DDB did two very funny energy efficiency PSA’s for the Alliance to Save Energy. One was about the “static electricity house” (in which the kids rubbed their stockinged feet to power the appliances). Another was about an energy-themed school science fair. Can someone find the links and post them in comments?
UPDATE: You can find the two other spots here.