Corridor Business Journal: A proposed partial settlement to Alliant Energy's 2017 rate case calls for an 8.6 percent increase in the utility's overall electric rates in Iowa. Alliant filed the rate case on April 3, and implemented its interim base rate increase on April 13. Late last week, the company said the settlement proposed will boost rates 2 percent above the interim rate, for a total 8.6 percent rate increase.