UPDATE: I received a letter in the mail with notice that the EV plate registration would be increasing to $251 annually. As a "courtesy" I received a new license plate sticker which was valid until 1/20. Courtesy my @$$, the only reason they issued a one month extension sticker was to push my renewal out into 2020, so then they would be able to assess the $251 annual fee.
I thought I would be able to renew in 2019 for two years at the lower rate, but no, not an option now. Welcome to Illinois where they find a way to get every dollar out of your pocket they possibly can.