About JIS Energy
Engineers Replacing Spreadsheets with Engineering-Grade Software
JIS Energy builds CogenS™ — a cloud-based technoeconomic analysis platform for CHP, thermal, and DER microgrid systems. Founded in Houston, used by energy professionals across 44+ countries.
Founder
Jack Souweha, PE
Jack started JIS Energy after two decades in HVAC engineering, building automation, and integrated energy systems. He saw the same pattern over and over — every feasibility study a one-off Excel model, every assumption buried, every analysis impossible to audit a year later.
CogenS™ is the platform he wanted as a practicing engineer: real manufacturer data, real weather, real tariffs, full lifecycle cost — all producible in minutes instead of weeks, and reproducible across a team.
Jack is a Professional Engineer based in Houston, TX. Before JIS Energy he consulted on commercial CHP, district energy, and large building HVAC projects across North America and the Middle East.
How we build
The principles behind CogenS™
Engineering rigor
We don't bury assumptions in macros. Every CogenS™ model is built on peer-reviewed standards (DOE, NREL, ASHRAE) with manufacturer performance curves. The math is auditable.
Clarity over complexity
Energy infrastructure decisions are already complex enough. The platform's job is to surface the answer — NPV, IRR, payback, lifecycle CO₂ — not to make you wade through a spreadsheet.
Real-world data
TMY weather, multi-tier utility tariffs, equipment manufacturer specs across 340+ cities. If the simulation isn't grounded in real data, the financial model is fiction.
Timeline
From CHP Selector to a full TEA platform
JIS Energy founded
Started in Houston, Texas with the goal of replacing spreadsheet-driven energy feasibility studies with engineering-grade software.
CHP Selector launched
First commercial product — a desktop tool for combined heat and power (CHP) selection with built-in equipment vendor data, performance curves, and lifecycle cost analysis.
Thermal Systems Suite
Expanded the product family to cover commercial boilers, chillers, cooling towers, and domestic hot water heaters — each with its own 8,760-hour simulation engine and multi-vendor comparison.
Cloud platform — CogenS™
Migrated the entire product family from desktop to a cloud-based SaaS platform. No more MATLAB Runtime, no more installs — full TEA in your browser.
DER optimization & RateAcuity
Added joint optimization of CHP + Solar + BESS + thermal energy storage in a single workflow, plus the RateAcuity live tariff add-on for US and Canada.
Global reach
Houston headquarters. Customers across 44+ countries.
CogenS™ ships with pre-loaded weather, utility tariffs, and equipment data for 340+ cities across 24 countries. Financial outputs auto-convert to 40+ currencies. Engineers from Texas to Tokyo run their feasibility studies on the same platform.