Energy Benchmarking

Watch the recording of the Portland and South Portland Energy Benchmarking Workshop held on 3/25/22.

2021 Reporting

Single-tenant buildings 20,000 sq ft or more are required to report energy and water use data by May 1, 2022. 

**Note that multi-tenant buildings 20,000 sq ft or more are not required to report in 2022.** Under the ordinance, multi-tenant buildings are required to report once the utility is able to provide usage information in a convenient electronic format. We anticipate multi-tenant buildings to start reporting in 2023. If you received a benchmarking letter for a multi-tenant building, please contact

Reporting link for Energy Star Portfolio Manager: 

When you share your report, please be sure to include your Unique Property ID (listed in alphabetical order by Property Owner). 

Upcoming workshops:

This March, the Portland and South Portland Sustainability Offices will be holding benchmarking workshops for property owners over Zoom. Sign up for the workshops through the Eventbrite links below. 


On November 7th, 2016 the City of Portland adopted an energy benchmarking ordinance which requires covered properties to annually report water and energy usage. You can view and download the ordinance here (Chapter 6, Article X, Page 65).

On July 15, 2019 the City Council voted to require all single-occupant buildings to begin reporting their energy and water consumption. A single-occupant building is defined as any building with a single tenant that utilizes 90% or more of the building space. 

All other covered properties must be compliant one year after the Sustainability Office certifies that the energy data is available from utilities in a convenient electronic format. The Sustainability Office will alert affected property owners when this certification is made. For more information contact the Sustainability Office at

Is my property covered?
This ordinance is currently in effect for select properties. To learn if this ordinance is currently in effect for your property, please see Reporting Deadlines below.

Properties covered under the ordinance include:

  • Municipal Buildings
  • Non-Residential single or grouped buildings over 20,000 sq. ft.
  • Residential Buildings that singly or together contain 50+ dwelling units

Reporting Deadlines:

  • Municipal Buildings: Reporting began on May 1, 2019. Reports are due each year by May 1.
  • Single-occupant buildings over 20,000 sq. ft.: Reporting began on May 1, 2020. Reports are due each year by May 1.
  • All other covered properties: Reporting deadline will be one year after the Sustainability Office certifies that the energy data is available from utilities in a convenient electronic format.

The Sustainability Office will notify all affected property owners by mail and will announce the new reporting deadline on the City webpage.

Covered Properties Building Information

Why did the City Council pass the ordinance?
You can’t manage what you don’t measure! The invisible nature of energy use and emissions make it difficult to further sustainability goals. In order to track progress, a baseline needs to first be established. This baseline will be used to measure the reduction of energy use as the City works toward its goal to reduce CO2 emissions 80% by 2050. In addition to saving financial and natural resources, a number of studies have tied higher energy efficiency scores to higher property values and higher occupancy rates. By simply making information publicly available, market forces begin to take action, enabling property owners, potential buyers, tenants, realtors, and others to make decisions based on the value of energy performance. Benchmark information will also inform City initiatives, educational outreach, and may potentially create opportunities for peer learning. 

How do I comply?
Buildings covered under the ordinance are required to report basic property information such as address and gross floor area, as well as yearly energy and water usage metrics through the EPA’s Energy Star Portfolio Manager Tool. Other descriptive information required will depend on property use type. For example, a supermarket will have to report different information than an office building. Once information is reported, buildings will be able to track energy use over time and will be provided with an energy score comparing their energy use to those of similar buildings. Helpful guides and tutorials are also available on the Energy Star Portfolio Manager website. A quick start guide can be found here and their training resources can be found here

While municipal buildings are continually being updated, the deadline for other covered properties will be one year after the Sustainability Office has certified that the energy data has been made available by the utilities. An updated timeline will be provided once the energy usage data is available for all covered properties.

Compliance Guide

1. Set up an ENERGY STAR Portfolio Manager account for the covered property.

All covered property owners are required to report energy and water use data through the free EPA ENERGY STAR Portfolio Manager. To help you through this process, follow the How-to-Guide for step-by-step instructions, from setting up an account for your property to adding utility meters and reporting.

2. Gather all energy and water use data for the covered property.
If you are unsure how to access your energy and water data online, see How-to-Guides at the bottom of this page with step-by-step instructions on how to pull your data using your utilities’ online tools.

a) Electricity - Collect monthly electricity usage from your Central Maine Power account.

b) Heat - For the appropriate heat source on your property, gather usage from each billing period from the supplier.

c) Water - The Portland Water District provides monthly water use and billing information through MyOnlineBilling. Property owners can create an account and download water data by following a 4-step prompt. To get started, be sure to have your account number present.

d) Natural Gas - Collect monthly natural usage from your Until, or other supplier, account.

3. Enter your monthly energy and water use data into Portfolio Manager.
Log into EPA Portfolio Manager and follow the How-to-Guide for step-by-step instructions on how to enter your energy and water data. 

4. Share your report with the City 

Click on this reporting link to share your 2021 report with the City: 

Detailed instructions on how to share your data using this reporting link can be found within the EPA How-to-Guide.

Don’t Forget - enter your Unique Property ID  (properties are listed alphabetically by property owner) as part of your report before sharing with the City. This ID will be used as the main property identifier year-over-year.

We realize that this process requires many steps and will take a bit of time to navigate and complete. We are here for you if you have any questions or need any help with this process. Please don’t hesitate to reach out to Erin Ferrell, with any questions. We appreciate your compliance with this ordinance.

Want to improve your ENERGY STAR score?

Northeast Energy Efficiency Partnerships                                                                                                                                                                                                                 Works to advance energy efficient solutions through stakeholder engagement, information exchange, and resource development. 
Efficiency MaineProvides a variety of programs and incentives to help you upgrade the efficiency of your home or business. Information on lighting, heating, appliances, water heating, heat pumps, and weatherization available. 
EPAProvides information on a range of energy efficient appliances, financing options, and steps that existing buildings can take to reduce their energy costs.

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