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In the Consumers Gas Company case (Docket No. 04-0609), the Company performed a cost of service study and based the
proposed rates on cost of service. Commission Staff reviewed that study and presented testimony. The Commission entered an
Order in June 2005.
In the Nicor Gas Company case (Docket No. 04-0779), the Company performed a cost of service study and based the proposed
rates on cost of service. Commission Staff reviewed that study and presented testimony. The Commission entered an Order in
September 2005.
In the Peoples Gas Company and North Shore Gas Company rate cases (Docket Nos. 07-0241 & 07-0242), the Companies
performed cost of service studies and based proposed rates on cost of service. Commission Staff reviewed the studies and
presented testimony. The Commission entered an Order in February 2008.
In the Mt. Carmel Public Utility Co. gas rate case (Docket No. 07-0357), the Company performed cost of service studies and
based proposed rates on cost of service. Commission Staff reviewed the study and presented testimony. The Commission
entered an Order in March 2008.
In the Ameren Illinois gas rate cases for each of its three Illinois Utilities (Docket Nos. 07-0588, 07-0589, & 07-0590), the
Companies performed cost of service studies, but based their proposed rates on an across-the-board equal percentage change.
Commission Staff reviewed the studies and the proposed across-the-board changes and presented testimony. The Commission
entered an Order in September 2008.
In the Nicor Gas Company gas rate case (Docket No. 08-0363), the Company performed cost of service studies and based
proposed rates on cost of service. Commission Staff reviewed the studies and presented testimony. The Commission entered
an Order in March 2009.
In the Illinois Gas Company gas rate case (Docket No. 08-0482), the Company performed cost of service studies and based
proposed rates on cost of service. Commission Staff reviewed the studies and presented testimony. The Commission entered
an Order in May 2009.
In February 2009, Peoples Gas Company and North Shore Gas Company filed rate cases (Docket Nos. 09-0166 and 09-0167).
These proposed tariffs were suspended by the Commission. The Commission entered an Order in January 2010.
In June 2009, AmerenCILCO, AmerenCIPS & AmerenIP filed gas rate cases (Docket Nos. 09-0309, 09-0310 & 09-0311). These
proposed tariffs were suspended by the Commission. The Commission entered an Order in May 2010.
In June 2009, MidAmerican Energy Company filed a gas rate case (Docket No. 09-0312). These proposed tariffs were
suspended by the Commission. The Commission entered an Order in March 2010.
In March 2010, Consumers Gas Company filed a gas rate case (Docket No. 10-0276). These proposed tariffs were suspended
by the Commission. An Order for these proceedings was approved in October 2010.
In February 2011, North Shore Gas Company and Peoples Gas Company filed rate cases (Docket Nos. 11-0280 & 11-0281).
These proposed tariffs were suspended by the Commission. An Order for these proceedings will be approved in January 2012.
In February 2011, Ameren filed a rate case (Docket No. 11-0282). These proposed tariffs were suspended by the Commission.
An Order for this proceeding will be approved in January 2012.
Commission Actions to More Fully Implement Cost-Based Rates: Electricity
The initial delivery services tariff cases to establish non-residential rates for delivery services involved all nine electric utilities:
AmerenCIPS and AmerenUE (Docket No. 99-0121)
MidAmerican Energy Company (Docket Nos. 99-0122 & 99-0130)
CILCO (Docket Nos. 99-0119 and 99-0131, Consolidated)
ComEd (Docket No. 99-0117)
IP (Docket Nos. 99-0120, 99-0134, and 99-0140, Consolidated)
IPC and SBWGE (Docket Nos. 99-0124, 99-0125, 99-0132, and 00-0133, Consolidated)
