According to excerpts from the story:
On January 10, 2007, the Urban Core Mayors adopted an aggressive, but realistic, "15 by 15" Renewable Portfolio Standard (RPS) for renewable energy.
Following the lead of Ann Arbor Mayor John Hieftje and Grand Rapids Mayor George Heartwell, the group decided the fiscal and economic incentives to adopt an RPS for State and municipal operations warranted immediate action.
Read the complete story at MiBiz
Nationwide movement of mayors toward renewables detailed in USA Today
tags: Michigan GrandRapids RenewableEnergy Mayors