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Report Shows Residential Retail Supplier Rates As High As $3.91 per Therm
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The highest residential alternative gas supplier (AGS) rate in Illinois charged during the period September 1, 2024
through August 31, 2025 was a fixed rate
of $3.91 per therm, which was charged from September 2024 through August 2025, by an AGS in the Nicor service area, according to an annual natural gas market report from the Illinois Commerce Commission's Office of Retail Market Development
In August 2024, the Nicor variable supply rate was $0.36 per therm, and the highest Nicor supply rate during the period September 1, 2024
through August 31, 2025 was $0.58 per therm.
The ICC's residential AGS new offer archives only go back one year (thus August 2024 & September 2024 offers are not available), but in October 2024, numerous AGSs were offering residential plans at Nicor in the range of $0.50 per therm
For the North Shore
Gas territory, the highest residential AGS rate charged was a fixed rate of $3.38 per therm charged from November
2024 through May 2025. For the People’s Gas territory, the highest residential AGS rate charged was a variable rate of
$1.80 per therm, which was charged from September 2024 through August 2025
The lowest residential AGS rate charged in the Nicor territory was a variable rate
product of $0.124 per therm charged in September of 2024. In the North Shore Gas territory, the lowest
residential AGS rate was $0.124 per therm, charged in September 2024 under a variable product. In
the People’s Gas territory, the lowest residential AGS rate was $0.124 per therm, charged in September 2024 under a variable product
In reporting the statutorily required AGS charged rate information, ORMD noted that, "The statute does not require, and AGS did not provide, a description of the types of products associated
with the various rates charged or how many customers are enrolled on each rate. Given the number of
non-rate benefits, such as airline miles and smart devices, that the AGS utilize in their marketing
promotions, this omission often renders it difficult to accurately reflect the benefits provided to
customers. Additionally, the reports do not include information about how the various rate products
were marketed to customers."
ORMD reported that in the Small Volume Transportation (SVT) market, which includes residential and small non-residential customers, AGSs as of December 2024 served more than 190,000 residential and more than 55,000 small non-residential
customers, representing 6.16% of eligible residential customers and more than 19.15% of small
non-residential customers
Combined, there were 246,351 SVT customers on AGS
supply in 2024, compared to 274,529 in 2023.
By utility, residential shopping was as follows as of December 2024:
In 2024, there were 44 active SVT suppliers in the Nicor Gas, Peoples Gas, and North Shore Gas
territories.
For the residential market, as of August 2025, 13 suppliers were posting offers on the ICC's rate board at Nicor, 10 were posting offers at Peoples, and 10 were posting offers at North Shore. The posting of residential supply offers is mandatory for AGS companies
Using a Herfindahl-Hirschmann Index (HHI) value, ORMD said that the residential market remains competitive across all three
utility territories, with little change from the prior year
ORMD reported on the market share of AGSs with respect to migrated residential customers (market share of switched customers, not overall distribution customers), as shown below:
The only notable changes from the year-ago market share data is that, at Peoples Gas, the aggregate residential market share of the three largest AGSs decreased from 35% in 2023 to 32% in 2024
Additionally, in the Nicor residential market, the number of AGSs with 0-1% market share decreased from 22 in 2023 to 18 in 2024, while the number of AGSs with 1-5% market share increased from 6 in 2023 to 9 in 2024
For the third year in a row, no supplier in the Peoples Gas territory served more than 15% of the residential market.
Link to ORMD gas report
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October 29, 2025
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Copyright 2025 EnergyChoiceMatters.com
Reporting by Paul Ring • ring@energychoicematters.com
Number Of % Of Total
Migrated Customers
Customers Switched
Nicor 140,023 6.7%
Peoples 41,014 4.8%
North Shore 9,797 6.4%
2024 AGS Market Share Of Switched
Residential Customers
Nicor Peoples North
Shore
% Market
Share Of
Largest 3
AGSs 44% 32% 46%
Range of Number Of Suppliers
Share within Market Share % Range
Nicor Peoples North
% Share Shore
> 15% 1 0 2
5-15% 6 8 5
1-5% 9 8 6
0-1% 18 16 10
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