Case study
Engineer-led. Designed to cut your energy costs.
We pair building systems expertise in HVAC, electrical, BMS, and controls with fuel procurement strategies, so your facility uses less and pays less for what it uses.
For over 15 years, we've helped organizations manage energy costs. Here's how- Free to you
- No obligation
- Engineers walk your building
The in-person audit
What happens when we walk your building.
-
01
Walk the facility
Our engineers tour your mechanical rooms, rooftop equipment, electrical service and controls in person.
-
02
Review your data
We read your utility bills and interval data alongside what we see on site to find where energy is being wasted.
-
03
Share the findings
You get a clear list of opportunities ranked by savings and payback, with no obligation to move forward.
-
04
Build the plan
We map out the efficiency work first, then the smarter way to buy the energy you still need.
Have ready
- Your last 12 months of utility bills
- Building size, age and primary uses
- A list of major equipment, if you have one
- A facility contact who can open mechanical spaces
Results to date
Typically 18-33% lower energy costs, with more than $35 million returned to clients.
- returned to clients
- $35M+
- commercial clients
- 500+
- municipalities served
- 50+
- client retention
- 98%
Who we serve
- Municipalities
- Schools and universities
- Community buildings
- Commercial properties
Subscribe to Mill Street Energy Insights
Practical notes on building performance and energy markets, monthly.
Or continue with
Where we can help
Solutions for every system in your building.
-
VFD/VSD Drives
Motors, pumps, fans
-
Lighting Controls
Sensors, dimmers, scheduling
-
Refrigeration
Walk-ins, display cases, controls
-
Weatherization
Air sealing, insulation, windows
-
Spray Foam Insulation
Closed cell, open cell applications
-
Dual Fuel Systems
Hybrid heating solutions
-
Heatpump Chillers
High-efficiency cooling
-
HVAC Controls
Thermostats, zoning, scheduling
-
Solar PV
Rooftop, carport, ground mount
-
EV Charging
Level 2, DC fast charging
-
Energy Storage
Battery systems, peak shaving
Not sure where to start? Our engineers will walk your facility in person and assess it.
Schedule Free AssessmentWe are here to simplify the energy industry
For over 15 years, Mill Street Energy has been delivering solutions that transform how organizations manage energy costs
Learn about our approachReduce usage, then reduce cost. In that order.
Most firms sell you either efficiency or a supply contract. We do both, in sequence, so every saving builds on the one before it.
-
01
Measure & Audit
Bills, interval data, and a walk-through of your systems establish a baseline and show where the waste is.
-
02
Optimize Systems & Controls
HVAC, electrical, BMS, and controls fixes cut the kilowatt-hours and therms you use in the first place.
-
03
Procure Smarter
With a smaller, flatter load, we buy the remaining energy through layered strategies at a better unit cost.
How the steps compound (illustrative)
Baseline spend
After optimization: less usage
After procurement: lower rate on what's left
Illustration only. Actual results vary by building, systems, and market conditions.
Industries
Built for buildings that can't afford to waste energy.
Municipalities, schools, hospitals and manufacturers across New England trust us to cut what they use and what they pay.
-
33% cost reduction
Manufacturing, Central MA
Manufacturing facility achieves predictable energy costs
Independent supplier comparison and strategic natural gas hedging delivered $127K in annual savings on $380K of spend.
-
40% cost reduction
Education, Western MA, 850K sq ft
Regional school district transforms 12 buildings
Independent procurement combined with LED and HVAC upgrades delivered $210K in annual savings.
-
24/7 critical operations
Healthcare, New England
Regional hospital secures three-year budget protection
An independent hedging strategy provides $196K in annual savings and the predictability healthcare planning needs.
-
$500K incentives captured
Community, Eastern MA
Youth services center achieves full-site electrification
A complete HVAC replacement with professional engineering maximized utility rebates across the facility.
-
15% average resident savings
Municipal, Greater Boston
Municipal partner launches community aggregation
A municipal aggregation program gives residents renewable energy choices and meaningful cost savings.
-
Net-zero ready
Community
Community center becomes a net-zero ready campus
Engineering and incentive capture prepared the campus for a low-carbon future.
Free in-person audit
Let our engineers walk your building and show you where the savings are.
Free, no obligation. We review your utility bills and tour your systems on site, then give you a ranked list of opportunities.