Find information about contracting with Hennepin County, including processes, forms, and diversity rules for goods and biddable services. Bids are generally submitted in the county's electronic bidding system, Supplier Portal.The Bidding Requirements consist of the Invitation to Bid, Instructions to Bidders,. Subject to the provisions contained and incorporated herein, the County agrees to pay the. We provide resources for this project. Documents This page links to PDF files.