Residential Energy Labeling

Residential energy labeling offers a variety of benefits to homeowners, renters, potential buyers, sellers, and communities as a whole by shedding light on important information that is often overlooked - the energy performance or usage of your home.  By informing residents of their home's energy needs, labels empower residents to take an active role in their energy and financial resource management. The ability to estimate energy costs and system needs protects consumers by providing transparency to the costs of operating a home. Home energy labels can help residents to lower energy bills, which are often one of the largest expenses for homeowners, a burden that disproportionately falls on low-income and historically marginalized home owners and renters. 

Learn more about residential energy labeling in Vermont here

What is HELIX?

HELIX facilitates consolidation of energy data in a single portal and makes it available to the real estate market

In the home buying process, what we don’t see tends to be forgotten. The new marble countertop and remodeled bathroom are gratifying and aesthetically pleasing, though efficiency investments and resulting energy usage are just as important. This is especially true considering energy is often the highest cost of home maintenance. Home Energy Labeling Information eXchange (HELIX) makes this information visible by auto-populating home energy labels (e.g. U.S. DOE Home Energy Score, RESNET HERS) and solar PV data in local real estate markets.


HELIX is capable of automatically populating real estate listings - whether they are accessed through local Multiple Listing Services (MLS) or portals like Trulia and Zillow - with home energy information from Home Energy Score and other sources when it is available and approved by the seller. HELIX currently has data for all 12 states and the District of Columbia in NEEP’s region and is working to connect with local Multiple Listing Services. States and cities can use HELIX to manage their voluntary and mandatory home energy labeling programs. A joint effort with NEEP and ClearlyEnergy was established to develop a cost-effective tool, Energy Estimator - Powered by HELIX & ClearlyEnergy, that pulls from publicly-available tax assessor databases and from HELIX to generate a customizable home energy label. 


If you are a data provider, MLS, state, or a community, click the box below to learn more about how HELIX can work for you!


Project Strategy


Database Development and Implementation

Ability to provide a replicable, open-sourced model that can be used across the nation

Real Estate Community Outreach and Training

Transparent stakeholder engagement on the value proposition of home energy information

Continuing Development of Functionality

Streamlined actionable information in the places it can provide the most value in the real estate market




We are currently working with the following data providers

us doe
energy star
home innovation
ct green bank
nh puc
Efficiency Vermont
energy action network


Do you have data that should be in HELIX? Contact us!


Capturing the Sun: HELIX to auto-populate residential solar energy data into the Multiple Listing Service

With the advancement of technologies and practices in the real estate market, homes have become increasingly efficient. At the same time, the price of solar PV is going down and more consumers are actively seeking it for their homes. In the National Association of REALTORS 2019 Sustainability Report, 83 percent of surveyed agents and brokers surveyed said that properties with solar panels were available in the market. However, solar panels (just like energy efficiency atrributes) create confusion around how to properly appraise a home. Therefore, making solar PV information easily accessible to real estate professionals, as well as homebuyers and sellers, will create greater awareness and value of the benefits of solar in the residential marketplace.


To overcome this disconnect, Lawrence Berkeley National Lab (LBNL) is partnering with NEEP and ClearlyEnergy to use HELIX, which is recognized as a flexible and customizable database capable of integrating diverse energy data fields and auto-populating multiple listing services (MLS) with information like solar PV. The main objective is to dramatically expand the auto-population of solar PV data into MLS listings so that the real estate industry can properly account for this asset during the valuation process.


Modify & maintain HELIX to accept solar data

This data includes ownership, total system capacity, address, installation date, and annual system output

Build out MLS with PV auto-pop capabilities

The project began with four Northeastern states in early 2019 (VT, NH, MA, CT) and will expand to as many as 20 states through 2021

Engage stakeholders & expand real estate awareness of HELIX
This includes plans for HELIX to become a self-sufficient business model



With this grant, funded by LBNL and the U.S. Department of Energy, the project team is excited to expand the capabilities of the database in order to transform the real estate market towards valuing energy efficiency and renewable energy assets with the ultimate goal of greater savings, more comfortable living spaces, and the decarbonization of our residential building sector.

Additional Resources

The HELIX project has been made possible by funding through a U.S. DOE State Energy Program grant hosted by Vermont, Lawrence Berkley National Lab, and support from Massachusetts Department of Energy Resources, Rhode Island Office of Energy Resources, NHSaves, Energize Connecticut, and continued input from stakeholders from across the Northeast region and beyond.

Stay informed

Stay up to date with the latest NEEP and industry news, policies, and trends to your inbox every so often.