Rather than setting up a Very Large Customer agreement that would apply consistently to any hyperscale energy users (like data centers) in its territory, Alliant Energy is setting electric rates for these customers one at a time. Right now, they are setting the electric rates for the Beaver Dam data center.
Unfortunately, almost all of the relevant information is redacted from the publicly available document with the draft rate proposal - the power needed, customer name, length of term, and details of charges including demand charges.
Because the public is not able to see the relevant information about this draft rate agreement, we have no way of knowing the details of the proposal. Send a message to the PSC asking to make sure that there are no discounts for the Beaver Dam data center!