Hammered out at a regional summit in Milwaukee , the pact calls for a 2 % reduction in energy use by 2015 , with a 2 % cut every year after that ; an increase in the availability of a cleaner ethanol-gasoline mix known as E85 ; and 10 % of the region 's electricity to come from renewable sources by 2015 , with an increase to 30 % by 2030 .