top of page
Image by Kirk Thornton

About Us

KC primary on blue.png

BE-Ex STL Mission

To advance building energy performance by mobilizing the professional expertise, funding, and technical resources the real estate industry needs to address affordability, improve the health and comfort of residents, and position St. Louis as a resilient and carbon neutral region.



The greenest buildings are those already built

St. Louis has a huge stock of “green” already-built buildings. Still, studies show that our buildings are less efficient than the national average – a huge opportunity for improving the cost of living, financial burden of building ownership and health and wellness of our community.

The Building Energy Exchange St. Louis is here to help make energy efficiency a reality in our built environment.


BE-Ex STL Backstory

Greenhouse gasses are driving major shifts in the climate of our earth. In the City of St. Louis, residential, commercial and industrial buildings account for 80% of greenhouse gas emissions – both day to day operations and during the design and construction. Reduction in consumption of energy in our buildings represents a tremendous opportunity to reduce emissions, save money, create jobs and protect public health. 


St. Louis jumped to the forefront of sustainability by passing and signing into law critical regulations to reduce greenhouse gas emissions: Building Energy Performance Standards (BEPS). This landmark policy - just the fourth of its kind in the US and the first in the Midwest - put the City of St. Louis at the center of advancing policy to address energy efficiency and will help make St. Louis a climate ready and carbon neutral region.

Building Energy Exchange St. Louis (BE-Ex STL) was borne out of a desire to help building owners comply with BEPS and to serve as a regional resource to reduce energy consumption and greenhouse gas emissions.


BE-Ex STL is administered by USGBC-Missouri Gateway Chapter and has launched with foundational support from Washington University, Ameren Missouri, Spire, the Leon Lowenstein Foundation, NRDC, and other key partners locally and nationally. We are working in collaboration with other programs throughout the United States including Building Energy Exchange: a center of excellence in NY and one of the first hubs of energy efficiency resources in the US, Institute for Market Transformation and the Building Innovation Hub in DC and will be launching alongside the Building Energy Exchange Kansas City.

BE-Ex STL Leadership

Malachi Headshot 2022.png

Malachi Rein



Rein joined BE-Ex STL in September 2022. He has a B.S. in Architectural Engineering from Missouri S&T and an A.A. in Communications from St. Louis Community College.  He brings experience in facilities management, operations, and project management.  


Rein has a passion for creating a more sustainable built environment. He is a LEED AP BD+C and holds certifications through GPRO Operations and Maintenance Essentials and Building Operator Level 1.  A lifelong resident of the Saint Louis region, he firmly believes that our buildings matter and that we can empower positive change that impacts our balance with our planet and the lives of real people.

BE-Ex STL Board

The BE-Ex STL board of directors is made up of a diverse set of leaders representing many areas of expertise in energy efficiency, development, and sustainability. This board will shape our strategic direction and our areas of focus.