Ameren Illinois Company

What This Utility Data Tells You

Ameren Illinois Company is an investor-owned utility operating in Illinois under EIA identifier 56697. It reports service to approximately 691,223 customer accounts and generated about $1.49 billion in annual electric revenue, with a service footprint spanning 500 ZIP codes. As an investor-owned utility, it operates under state public utility commission oversight that reviews rate cases and reliability performance.

In 2023, the average Ameren Illinois Company customer experienced 592.1 minutes of power interruptions, a metric called SAIDI (System Average Interruption Duration Index). Excluding major weather events from that total, that falls inside the typical 120–180 minute national benchmark, in line with what most U.S. distribution utilities report. SAIFI, the average number of outage events per customer, was 1.33 for the same period, so customers statistically faced roughly 1 distinct interruption that year. Strip out major event days (hurricanes, ice storms) and SAIDI falls to 113.9 minutes; the difference from the headline 592.1 shows how much of the outage total came from weather rather than everyday grid issues.

The EIA dataset includes 4 years of continuous reporting (2020–2023) for Ameren Illinois Company, which lets you see whether reliability is trending up or down rather than judging from a single snapshot. SAIDI has increased from 223.6 to 592.1 minutes, which may reflect either worsening weather exposure or delayed grid modernization.