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---
type: "Bill"
title: "Renewable Energy Portfolio Standard - Wastewater Heating or Cooling System"
description: "Renewable Energy Portfolio Standard - Wastewater Heating or Cooling System"
jurisdiction: "us/states/md"
legislature: "Maryland General Assembly"
session: "2021"
identifier: "HB 561"
citation: "Maryland HB 561 (2021)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["D.E. Davis"]
version_count: 3
action_count: 14
vote_count: 2
first_action: "2021-01-20"
last_action: "2021-05-30"
source: "openstates"
source_identifier: "ocd-bill/d3280357-4129-4d0f-a55d-c772fbb5d66c"
source_url: "http://mgaleg.maryland.gov/mgawebsite/Legislation/Details/hb0561?ys=2021RS&search=True"
source_hash: "ce091c7ee9a639195592ed4e61ea70aacf91b1e6877e3e881d7bb55d49d0f438"
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-md"]
---
# Maryland HB 561 (2021) — Renewable Energy Portfolio Standard - Wastewater Heating or Cooling System
## Version chain
The bill's text revisions, in order — the diff chain from filing to enrollment.
1. **Chapter - Renewable Energy Portfolio Standard - Wastewater Heating or Cooling System** (committee substitute) — [source](http://mgaleg.maryland.gov/2021RS/Chapters_noln/CH_691_hb0561t.pdf)
2. **First - Renewable Energy Portfolio Standard Wastewater, Thermal, and Other Renewable Sources** (committee substitute) — [source](http://mgaleg.maryland.gov/2021RS/bills/hb/hb0561f.pdf)
3. **Third - Renewable Energy Portfolio Standard - Wastewater Heating or Cooling System** (committee substitute) — [source](http://mgaleg.maryland.gov/2021RS/bills/hb/hb0561t.pdf)
## Votes
- On Third Reading — **11220** (pass) · lower
- On Third Reading — **450** (pass) · upper
## Sponsors
- D.E. Davis — primary (person)
## Timeline
The legislative action history — every referral, reading, and vote.
- **2021-01-20** First Reading Economic Matters `referral-committee`
- **2021-01-20** Hearing 1/29 at 1:30 p.m.
- **2021-03-19** Favorable with Amendments Report by Economic Matters `committee-passage-favorable`
- **2021-03-19** Favorable with Amendments { `committee-passage-favorable`
- **2021-03-19** Second Reading Passed with Amendments
- **2021-03-20** Third Reading Passed `passage`
- **2021-03-22** Referred Finance `referral-committee`
- **2021-03-23** Hearing 3/30 at 1:00 p.m.
- **2021-04-09** Favorable Report by Finance `committee-passage-favorable`
- **2021-04-09** Favorable Adopted `committee-passage-favorable`
- **2021-04-09** Second Reading Passed
- **2021-04-10** Third Reading Passed `passage`
- **2021-04-12** Returned Passed
- **2021-05-30** Enacted under Article II, Section 17(c) of the Maryland Constitution - Chapter 691 `became-law`
## Source
OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/d3280357-4129-4d0f-a55d-c772fbb5d66c`. Confidence: reported (aggregated from official Maryland legislature records).