Kansas regulators approved part of the higher rates last month, only two months after approving a $130 million increase in the utility's rates.
The latest round of rate increases would cover costs associated with the company's transmission system, environmental upgrades to its plants and its investments in wind farms.
Westar is spelling out anticipated rate increases for institutional investors.
The Kansas Corporation Commission last month approved a rate increase of nearly $32 million to cover costs associated with the transmission system.
The commission plans to consider other rate issues this spring and summer.