Ballot Initiative 937 (official name Initiative measure no. 937, known as I-937) is a clean energy initiative passed in the US state of Washington, appearing on the ballot in the November 2006 elections. The initiative requires large utilities to obtain 15% of their electricity from new renewable resources such as solar and wind (but excluding hydro) by 2020 with incremental steps of 3% by 2012 and 9% by 2016. It also requires that utilities undertake all cost-effective energy conservation.