Contact Us Willow River Geothermal 204 Power Avenue North PO Box 138 Hinckley, MN 55037 218-380-8180 Thank you for your interest in Willow River Geothermal and a geothermal comfort system. Please fill out the form below and someone will contact you shortly. We'll answer any questions you have and can provide you with a free estimate for your unique geothermal situation in Pine County and the surrounding region. Required Required Not a valid email Required Not a valid phone number Mailing Address is my Home Address Your work phone Fire or Ice