The table below shows Illinois Energy's FlexPlan® variable rates and Nicor Gas' gas supply costs for the past 12 months.
| Offer Month | FlexPlan Variable Rate | Nicor Gas' Supply Cost |
|---|---|---|
| Nov 2025 | $0.541/per therm | $0.39/per therm |
| Oct 2025 | $0.488/per therm | $0.39/per therm |
| Sep 2025 | $0.489/per therm | $0.45/per therm |
| Aug 2025 | $0.510/per therm | $0.52/per therm |
| Jul 2025 | $0.503/per therm | $0.54/per therm |
| Jun 2025 | $0.511/per therm | $0.54/per therm |
| May 2025 | $0.503/per therm | $0.54/per therm |
| Apr 2025 | $0.575/per therm | $0.58/per therm |
| Mar 2025 | $0.592/per therm | $0.38/per therm |
| Feb 2025 | $0.621/per therm | $0.32/per therm |
| Jan 2025 | $0.655/per therm | $0.28/per therm |
| Dec 2024 | $0.608/per therm | $0.25/per therm |