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---
type: "Bill"
title: "Public utilities: public service commission; certain provisions regarding rate cases and integrated resource plans; revise. Amends secs. 6a, 6m & 6t of 1939 PA 3 (MCL 460.6a et seq.) & adds sec. 6aa. TIE BAR WITH: SB 0271'23, SB 0273'23"
description: "Public utilities: public service commission; certain provisions regarding rate cases and integrated resource plans; revise. Amends secs. 6a, 6m & 6t of 1939 PA 3 (MCL 460.6a et seq.) & adds sec. 6aa. TIE BAR WITH: SB 0271'23, SB 0273'23"
jurisdiction: "us/states/mi"
legislature: "Michigan Legislature"
session: "2023-2024"
identifier: "SB 502"
citation: "Michigan SB 502 (2023-2024)"
classification: ["bill"]
subjects: ["Public utilities: public service commission"]
status: "enacted"
primary_sponsors: ["Sue Shink"]
version_count: 11
action_count: 30
vote_count: 3
first_action: "2023-09-14"
last_action: "2023-12-29"
source: "openstates"
source_identifier: "ocd-bill/94ceaf92-14db-425c-a8bc-cbabbeb2620d"
source_url: "https://legislature.mi.gov/Bills/Bill?ObjectName=2023-SB-0502"
source_hash: "07b5c1bf6872fb42fddeed5f5e0536ddd5de98129490ab895d5b07044b257bf3"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-mi"]
---
# Michigan SB 502 (2023-2024) — Public utilities: public service commission; certain provisions regarding rate cases and integrated resource plans; revise. Amends secs. 6a, 6m & 6t of 1939 PA 3 (MCL 460.6a et seq.) & adds sec. 6aa. TIE BAR WITH: SB 0271'23, SB 0273'23
## Version chain
The bill's text revisions, in order — the diff chain from filing to enrollment.
1. **As Passed by the House** (committee substitute) — [source](https://legislature.mi.gov/documents/2023-2024/billengrossed/Senate/pdf/2023-SEBH-0502.pdf)
2. **As Passed by the Senate** (committee substitute) — [source](https://legislature.mi.gov/documents/2023-2024/billengrossed/Senate/pdf/2023-SEBS-0502.pdf)
3. **Public Act** (committee substitute) — [source](https://legislature.mi.gov/documents/2023-2024/publicact/pdf/2023-PA-0231.pdf)
4. **Senate Concurred Bill** (committee substitute) — [source](https://legislature.mi.gov/documents/2023-2024/billconcurred/Senate/pdf/2023-SCB-0502.pdf)
5. **Senate Introduced Bill** (committee substitute) — [source](https://legislature.mi.gov/documents/2023-2024/billintroduced/Senate/pdf/2023-SIB-0502.pdf)
6. **Substitute (H-6)** (committee substitute) — [source](https://legislature.mi.gov/Home/GetObject?objectName=2023-SCVBS-0502-0O3326.pdf)
7. **Substitute (S-4)** (committee substitute) — [source](https://legislature.mi.gov/Home/GetObject?objectName=2023-SCVBS-0502-00B74.pdf)
8. **Substitute (S-4) - 2** (committee substitute) — [source](https://legislature.mi.gov/Home/GetObject?objectName=2023-SCVBS-0502-0B735.pdf)
9. **Substitute (S-6)** (committee substitute) — [source](https://legislature.mi.gov/Home/GetObject?objectName=2023-SCVBS-0502-0C107.pdf)
10. **Substitute (S-6) - 2** (committee substitute) — [source](https://legislature.mi.gov/Home/GetObject?objectName=2023-SCVBS-0502-00D78.pdf)
11. **Substitute (S-6) - 3** (committee substitute) — [source](https://legislature.mi.gov/Home/GetObject?objectName=2023-SCVBS-0502-0D319.pdf)
## Votes
- passed; given immediate effect Roll Call # 488 Yeas 56 Nays 52 Excused 0 Not Voting 2 — **56–52** (pass) · lower
- PASSED ROLL CALL # 613 YEAS 20 NAYS 18 EXCUSED 0 NOT VOTING 0 — **20–18** (pass) · upper
- ROLL CALL: ROLL CALL # 676 YEAS 20 NAYS 17 EXCUSED 1 NOT VOTING 0 — **20–17** (pass) · upper
## Sponsors
- Sue Shink — primary (person)
- Dayna Polehanki — cosponsor (person)
- Rosemary Bayer — cosponsor (person)
- Stephanie Chang — cosponsor (person)
## Timeline
The legislative action history — every referral, reading, and vote.
- **2023-09-14** INTRODUCED BY SENATOR SUE SHINK `introduction`
- **2023-09-14** REFERRED TO COMMITTEE ON ENERGY AND ENVIRONMENT `referral-committee`
- **2023-10-26** REPORTED FAVORABLY WITH SUBSTITUTE (S-4) `committee-passage`
- **2023-10-26** REFERRED TO COMMITTEE OF THE WHOLE WITH SUBSTITUTE (S-4) `referral-committee`
- **2023-10-26** REPORTED BY COMMITTEE OF THE WHOLE FAVORABLY WITH SUBSTITUTE (S-6) AND AMENDMENT(S) `committee-passage`
- **2023-10-26** SUBSTITUTE (S-6) AS AMENDED CONCURRED IN
- **2023-10-26** PLACED ON ORDER OF THIRD READING WITH SUBSTITUTE (S-6) AS AMENDED
- **2023-10-26** RULES SUSPENDED
- **2023-10-26** PLACED ON IMMEDIATE PASSAGE
- **2023-10-26** AMENDMENT(S) DEFEATED `amendment-failure`
- **2023-10-26** PASSED ROLL CALL # 613 YEAS 20 NAYS 18 EXCUSED 0 NOT VOTING 0 `passage`
- **2023-10-31** received on 10/27/2023 `introduction`
- **2023-10-31** read a first time `reading-1`
- **2023-10-31** referred to Committee on Energy, Communications, and Technology `referral-committee`
- **2023-11-01** reported with recommendation without amendment `committee-passage`
- **2023-11-01** referred to second reading
- **2023-11-02** read a second time `reading-2`
- **2023-11-02** placed on third reading
- **2023-11-03** read a third time `reading-3`
- **2023-11-03** substitute (H-6) adopted
- **2023-11-03** passed; given immediate effect Roll Call # 488 Yeas 56 Nays 52 Excused 0 Not Voting 2 `passage`
- **2023-11-03** returned to Senate
- **2023-11-07** LAID OVER ONE DAY UNDER THE RULES
- **2023-11-08** HOUSE SUBSTITUTE (H-6) CONCURRED IN
- **2023-11-08** ROLL CALL: ROLL CALL # 676 YEAS 20 NAYS 17 EXCUSED 1 NOT VOTING 0
- **2023-11-08** ORDERED ENROLLED
- **2023-12-29** PRESENTED TO GOVERNOR 11/21/2023 10:32 AM `executive-receipt`
- **2023-12-29** APPROVED BY GOVERNOR 11/28/2023 01:24 PM `executive-signature`
- **2023-12-29** FILED WITH SECRETARY OF STATE 11/29/2023 01:10 PM
- **2023-12-29** ASSIGNED PA 0231'23
## Source
OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/94ceaf92-14db-425c-a8bc-cbabbeb2620d`. Confidence: reported (aggregated from official Michigan legislature records).