---
type: "Bill"
title: "Energy conservation; modifying procedures for energy conservation measures and efficiencies in public facilities; effective date."
description: "Energy conservation; modifying procedures for energy conservation measures and efficiencies in public facilities; effective date."
jurisdiction: "us/states/ok"
legislature: "Oklahoma Legislature"
session: "2017-2018"
identifier: "HB 3536"
citation: "Oklahoma HB 3536 (2017-2018)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["Caldwell", "McCortney"]
version_count: 6
action_count: 26
vote_count: 3
first_action: "2018-02-05"
last_action: "2018-05-03"
source: "openstates"
source_identifier: "ocd-bill/ec21c23c-9c67-4459-9f4b-97dde94917f2"
source_url: "http://www.oklegislature.gov/BillInfo.aspx?Bill=HB3536&session=1800"
source_hash: "ed0630cef202b70fe97fc689a744f9202b8d6c8695af00523df139a5a7e4da40"
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-ok"]
---

# Oklahoma HB 3536 (2017-2018) — Energy conservation; modifying procedures for energy conservation measures and efficiencies in public facilities; effective date.

## Version chain

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

1. **Introduced** (filed) — [source](http://webserver1.lsb.state.ok.us/cf_pdf/2017-18 INT/hB/HB3536 INT.PDF)
2. **Amended And Engrossed** (committee substitute) — [source](http://webserver1.lsb.state.ok.us/cf_pdf/2017-18 AMENDMENTS/Amendment & Engr/HB3536 SAHB & ENGR.PDF)
3. **Engrossed** (committee substitute) — [source](http://webserver1.lsb.state.ok.us/cf_pdf/2017-18 ENGR/hB/HB3536 ENGR.PDF)
4. **Enrolled (final version)** (committee substitute) — [source](http://webserver1.lsb.state.ok.us/cf_pdf/2017-18 ENR/hB/HB3536 ENR.PDF)
5. **Floor (House)** (committee substitute) — [source](http://webserver1.lsb.state.ok.us/cf_pdf/2017-18 FLR/HFLR/HB3536 HFLR.PDF)
6. **Floor (Senate)** (committee substitute) — [source](http://webserver1.lsb.state.ok.us/cf_pdf/2017-18 FLR/SFLR/HB3536 SFLR.PDF)

## Votes

- THIRD READING — **70–14** (pass) · lower
- THIRD READING — **39–5** (pass) · upper
- FOURTH READING — **83–8** (pass) · lower

## Sponsors

- Caldwell — primary (person)
- McCortney — primary (person)

## Timeline

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

- **2018-02-05** First Reading `introduction, reading-1`
- **2018-02-05** Authored by Representative Caldwell
- **2018-02-06** Second Reading referred to Energy and Natural Resources `reading-2, referral-committee`
- **2018-03-01** CR; Do Pass Energy and Natural Resources Committee `committee-passage`
- **2018-03-01** Authored by Senator McCortney (principal Senate author)
- **2018-03-14** General Order
- **2018-03-14** Amended `amendment-passage`
- **2018-03-14** Third Reading, Measure passed: Ayes: 70 Nays: 14 `reading-3, passage`
- **2018-03-14** Referred for engrossment
- **2018-03-15** Engrossed, signed, to Senate `passage`
- **2018-03-15** First Reading `introduction, reading-1`
- **2018-03-22** Second Reading referred to Energy `reading-2, referral-committee`
- **2018-03-29** Reported Do Pass as amended Energy committee; CR filed `committee-passage`
- **2018-04-05** General Order, Considered
- **2018-04-05** Measure passed: Ayes: 39 Nays: 5 `passage`
- **2018-04-05** Referred for engrossment
- **2018-04-06** Engrossed to House `passage`
- **2018-04-06** SA's received
- **2018-05-03** SA's read, adopted
- **2018-05-03** Coauthored by Senator(s) Pittman
- **2018-05-03** Fourth Reading, Measure passed: Ayes: 83 Nays: 8 `passage`
- **2018-05-03** Referred for enrollment
- **2018-05-03** Enrolled, signed, to Senate
- **2018-05-03** Enrolled measure signed, returned to House
- **2018-05-03** Sent to Governor `executive-receipt`
- **2018-05-03** Approved by Governor 05/10/2018 `executive-signature`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/ec21c23c-9c67-4459-9f4b-97dde94917f2`. Confidence: reported (aggregated from official Oklahoma legislature records).