About
Built by an engineer
who gives a damn.
A cwm (pronounced coom) is a high mountain valley carved by glaciers — a bowl of stillness surrounded by peaks. It's an obscure English word, and a deliberate choice. We think about energy the same way: find the right terrain, understand the forces at work, and you can do a lot with very little.
CWM Energy started in the industrial energy sector — helping oil and gas operators understand where their emissions were actually coming from and what it would cost to reduce them. The methodology was rigorous, the analysis was quantitative, and the results were actionable. That approach works just as well on a house in Calgary as it does on a compressor station.
The tools on this site are the residential version of that same thinking. We built them for ourselves first — to understand our own homes, our own footprints, our own trade-offs. Now they're available to anyone.
Every calculation uses established Canadian methodology — NRCan data, NBCC climate tables, real provincial energy prices. No vague estimates, no greenwashing. Just numbers you can act on.
Sustainability doesn't mean doing less.
It means doing better.
Open Source
The calculation engines behind these tools are open source and peer-reviewable. If you're an engineer, an energy nerd, or just someone who wants to check our math — the code is on GitHub. Pull requests welcome.
View on GitHub →Get in touch
Questions, feedback, data corrections, or partnership inquiries — we want to hear from you.