The table below shows Illinois Energy's FlexPlan® variable rates and the North Shore Gas' gas supply costs for the past 12 months.
| Offer Month | FlexPlan Variable Rate | North Shore Gas' Supply Cost |
|---|---|---|
| Aug 2026 | $0.475/per therm | $0.4093/per therm |
| Jul 2026 | $0.5115/per therm | $0.4246/per therm |
| Jun 2026 | $0.487/per therm | $04237/per therm |
| May 2026 | $0.452/per therm | $0.5053/per therm |
| Apr 2026 | $0.504/per therm | $0.4982/per therm |
| Mar 2026 | $0.504/per therm | $0.4455/per therm |
| Feb 2026 | $1.194/per therm | $0.4676/per therm |
| Jan 2026 | $0.729/per therm | $0.5323/per therm |
| Dec 2025 | $0.689/per therm | $0.5153/per therm |
| Nov 2025 | $0.541/per therm | $0.4391/per therm |
| Oct 2025 | $0.488/per therm | $0.3648/per therm |
| Sep 2025 | $0.489/per therm | $0.3417/per therm |