New
DPDP Act compliance check for companies
, core duties apply from 13 May 2027
Know more
Justis AI
Product
Solutions
Use cases
Resources
Pricing
Sign In
Book Now
US law
Illinois
Regulations
Title 83 — PUBLIC UTILITIES
CHAPTER I: ILLINOIS COMMERCE COMMISSION
SUBCHAPTER b: PROVISIONS APPLICABLE TO MORE THAN ONE KIND OF UTILITY
Part 287 — RATE CASE TEST YEAR
Illinois · Regulations
Part 287 — RATE CASE TEST YEAR
4 sections
4 sections
83 Ill. Adm. Code 287.10
Applicability
83 Ill. Adm. Code 287.20
Test Year Options
83 Ill. Adm. Code 287.30
Updates to Future Test Year Data
83 Ill. Adm. Code 287.40
Pro Forma Adjustments to Historical Test Year Data
Part 287 — RATE CASE TEST YEAR | Illinois Regulations | Justis AI