P.O. Box 3838, Butte Montana 59702

Since 1976, the National Center for Appropriate Technology (NCAT) has been helping people by championing small-scale, local and sustainable solutions to reduce poverty, promote healthy communities and protect natural resources.

Alternative Energy Resources Organization

Mailing address: PO Box 1558, Helena MT 59624

Physical address: 32 S Ewing St #333, Helena MT 59601