Vistra, a major energy supplier for Illinois, just announced their 5th coal plant closure in September 2019! Illinois has a Renewable Portfolio Standard (RPS) of 25% by the year 2025. An RPS is an Illinois mandate that requires 25% of ComEd’s and Ameren’s power to come from a renewable source by the year 2025. California is a prime example of how expensive this transition can be, now the cost of power in California is 50% higher than the national average.