---
type: "Bill"
title: "PROP TX-WIND FARMS-EXTEND"
description: "Amends the Property Tax Code. Provides that a Division of the Code setting forth special valuation procedures for wind energy devices applies through assessment year 2016 (instead of 2011)."
jurisdiction: "us/states/il"
legislature: "Illinois General Assembly"
session: "96th"
identifier: "HB 4797"
citation: "Illinois HB 4797 (96th)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: []
version_count: 3
action_count: 34
vote_count: 2
first_action: "2010-01-12"
last_action: "2010-07-14"
source: "openstates"
source_identifier: "ocd-bill/c43cc8c5-12e2-4766-a1d3-f6ee1600fe18"
source_url: "http://ilga.gov/legislation/BillStatus.asp?DocNum=4797&GAID=10&DocTypeID=HB&LegId=49213&SessionID=76&GA=96"
source_hash: "c3ad1c85210898302e94cdc799420807f51d5f0409b1c640da0acaee87dcc157"
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-il"]
---

# Illinois HB 4797 (96th) — PROP TX-WIND FARMS-EXTEND

Amends the Property Tax Code. Provides that a Division of the Code setting forth special valuation procedures for wind energy devices applies through assessment year 2016 (instead of 2011).

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **Introduced** (filed) — [source](http://ilga.gov/legislation/fulltext.asp?DocName=09600HB4797&GA=96&SessionId=76&DocTypeId=HB&LegID=49213&DocNum=4797&GAID=10&Session=&print=true)
2. **Engrossed** (committee substitute) — [source](http://ilga.gov/legislation/fulltext.asp?DocName=09600HB4797eng&GA=96&SessionId=76&DocTypeId=HB&LegID=49213&DocNum=4797&GAID=10&Session=&print=true)
3. **Enrolled** (enrolled) — [source](http://ilga.gov/legislation/fulltext.asp?DocName=09600HB4797enr&GA=96&SessionId=76&DocTypeId=HB&LegID=49213&DocNum=4797&GAID=10&Session=&print=true)

## Votes

- Third Reading — **114–0** (pass) · lower
- Third Reading — **55–0** (pass) · upper

## Sponsors

- Frank J. Mautino — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2010-01-12** Filed with the Clerk by Rep. Frank J. Mautino `filing`
- **2010-01-12** First Reading `reading-1`
- **2010-01-12** Referred to Rules Committee `referral-committee`
- **2010-02-03** Assigned to Revenue & Finance Committee `referral-committee`
- **2010-02-18** Recommends Do Pass Subcommittee/ Revenue & Finance Committee; 003-000-000 `committee-passage`
- **2010-02-18** Remains in Revenue & Finance Committee
- **2010-03-02** Added Chief Co-Sponsor Rep. Jim Sacia
- **2010-03-11** Do Pass / Short Debate Revenue & Finance Committee; 011-000-000 `committee-passage`
- **2010-03-11** Placed on Calendar 2nd Reading - Short Debate
- **2010-03-17** Second Reading - Short Debate `reading-2`
- **2010-03-17** Placed on Calendar Order of 3rd Reading - Short Debate
- **2010-03-17** Added Chief Co-Sponsor Rep. Robert W. Pritchard
- **2010-03-18** Added Co-Sponsor Rep. Lisa M. Dugan
- **2010-03-18** Third Reading - Short Debate - Passed 114-000-000 `reading-3, passage`
- **2010-03-18** Added Co-Sponsor Rep. Jay C. Hoffman
- **2010-03-18** Added Co-Sponsor Rep. Donald L. Moffitt
- **2010-03-18** Added Co-Sponsor Rep. Shane Cultra
- **2010-03-18** Arrive in Senate `introduction`
- **2010-03-18** Placed on Calendar Order of First Reading March 23, 2010 `reading-1`
- **2010-03-18** Chief Senate Sponsor Sen. Don Harmon
- **2010-03-23** First Reading `reading-1`
- **2010-03-23** Referred to Assignments `referral-committee`
- **2010-04-06** Assigned to Revenue `referral-committee`
- **2010-04-14** Added as Alternate Chief Co-Sponsor Sen. Jeffrey M. Schoenberg
- **2010-04-15** Do Pass Revenue; 009-000-000 `committee-passage`
- **2010-04-15** Placed on Calendar Order of 2nd Reading April 20, 2010
- **2010-04-21** Second Reading `reading-2`
- **2010-04-21** Placed on Calendar Order of 3rd Reading April 22, 2010
- **2010-04-27** Third Reading - Passed; 055-000-000 `reading-3, passage`
- **2010-04-27** Passed Both Houses
- **2010-05-26** Sent to the Governor `executive-receipt`
- **2010-07-14** Governor Approved `executive-signature`
- **2010-07-14** Effective Date January 1, 2011
- **2010-07-14** Public Act . . . . . . . . . 96-1036 `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/c43cc8c5-12e2-4766-a1d3-f6ee1600fe18`. Confidence: reported (aggregated from official Illinois legislature records).