Where can I find information regarding past RFPs?

Up to procurement events from 2012, links to the RFPs are provided in two columns, one for ComEd and one for Ameren Illinois, at this link:

For the procurement events from 2014 onward, links to the RFPs are provided for all participating utilities at the top of this page:

For instance, the information related to the 2015 energy and capacity procurements are here:

Announcements