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CUB’s monthly report on gas market volatility: February 2025

Gas utilities file supply prices–called the Purchased Gas Adjustment (PGA)–each month with the Illinois Commerce Commission (ICC). Here’s what CUB uncovered in our review of prices in February.

  • Compared with last month (January 2025), prices were higher for eight of 9 utilities: Ameren Illinois (about 1.8 percent higher), Illinois Gas (about 2.8 percent), MidAmerican (about 9.5 percent), North Shore Gas (about 10.9 percent), Nicor Gas (about 14.3 percent), Peoples Gas (about 16.4 percent), Consumers Gas (about 24.3 percent), and Liberty Utilities (about 24.4 percent). Mt. Carmel was the only utility that saw its price go down, by about 7.3 percent. 
  • Compared with February 2024, prices were higher for six of 9 utilities, ranging from 6.4 percent higher for Ameren Illinois to 43.5 percent higher for Consumers Gas. Of the utilities with lower prices from a year ago, the drop ranged from 1.9 percent lower for Mt. Carmel to 46.8 percent lower for Liberty Utilities. See the list  below, comparing the PGAs for this month with a year ago.

February Gas Prices
Ameren Illinois– 46.32 cents per therm (up about 6.4 percent from February 2024)
Consumers Gas– 48.89 cents per therm (up about 43.5 percent from February 2024)
Illinois Gas– 50.77 cents per therm (up about 24.2 percent from February 2024)
Liberty Utilities– 31.25 cents per therm (down about 46.8 percent from February 2024)
MidAmerican Energy– 55.3 cents per therm (up about 12.6 percent from February 2024)
Mt. Carmel– 50.24 cents per therm (down about 1.9 percent from February 2024)
Nicor Gas– 32.00 cents per therm (down about 17.9 percent from February 2024)
North Shore Gas– 49.57 cents per therm (up about 19.9 percent from February 2024)
Peoples Gas– 38.94 cents per therm (up about 18.3 percent from February 2024)

Note: Your utility is determined by where you live, so you cannot switch from one utility to another. Under Illinois law, gas utilities are not allowed to profit off supply prices—they pass those costs from gas producers and marketers onto customers with no markup. State regulators annually review the utilities’ gas-management procedures to evaluate whether the companies did a reasonable job with their gas purchases, given market conditions, to hold down costs for consumers as much as possible.

A few tips from CUB:  

Join the fight for lower utility bills in 2025!