Best Energy Tech Companies in Wisconsin, United States
The 57 best Energy Tech companies in Wisconsin, United States in 2026, ranked by funding and momentum. Funding, investors, founders, valuation, tech stack and live signals. Top: Clarios.
Our analysis of 79 Energy Tech companies
$38.9b in tracked funding; 92% of the stack-profiled cohort runs cloud-native; funding activity peaked in 2025.
Ranked: Best Energy Tech companies in Wisconsin
| # | Company | Disclosed funding | Last round | Employees | Founded | Founder | Tech stack | Patents & IP focus | Recent signals |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Clarios Manufacturer of advanced low-voltage batteries and related energy storage solutions | $500M | 73 mo ago | 4,856 | 2013 | — | Progress SitefinityApple iCloud MailMicrosoft 365+28 | — | — |
| 2 | Encorp Demand response and smart communications systems | $53M | 260 mo ago | 60 | 1992 | — | — | — | — |
| 3 | Telkonet Provider of HVAC energy management solutions for commercial spaces | $25M | 125 mo ago | 27 | 1999 | — | WordPressMySQLPHP+25 | 16 patents Patents concentrated in electrical & electronics | — |
| 4 | Advanced Ionics Provider of solutions for hydrogen generation | $20M | 18 mo ago | 13 | 2017 | Chad Mason Founder & CEO | — | — | 1 expansion |
| 5 | Silatronix Developer of nanostructured electorde | $15M | 87 mo ago | 19 | 2007 | Mark Zager CEO | — | 70 patents Stabilizing PF6 salts in carbonate electrolytes for lithium‑ion battery chemistries | — |
| 6 | Odyne Systems Electrification solutions for work trucks, reducing emissions and fuel costs | $8M | 13 mo ago | 17 | 2009 | — | — | — | — |
| 7 | Monaire AI-enabled HVAC and refrigeration management solutions | $8M | 12 mo ago | — | 2020 | Rahul Subramany Co-Founder | — | — | — |
| 8 | EnSync Manufactures intelligent energy storage systems | $7M | 88 mo ago | 64 | 1986 | — | — | 59 patents Hybrid energy storage management and power flow control for renewable and backup systems | — |
| 9 | Blueline Battery Manufacturer of lithium-ion batteries for industrial, stationary, and mobile applications | $5M | 21 mo ago | 2 | 2015 | Dustin Herte Founder & CEO | — | — | — |
| 10 | Flux XII Developer of flow battery | $4M | 8 mo ago | — | 2021 | Patrick Sullivan Co-Founder & CEO | — | 5 patents Pyridinium-based redox mediators for flow battery electrolyte systems | — |
| 11 | Ebullient Offers cooling systems for data centers | $3M | 113 mo ago | 9 | 2012 | — | — | 69 patents Advanced two-phase cooling heat sink modules for high‑power electronics thermal management. | — |
| 12 | EDCS Power Platform that designs and builds equipment to improve power efficiency in data centers | $1M | 139 mo ago | 4 | 2013 | John Meinecke Co-Founder & CEO | — | — | — |
| 13 | AkitaBox SaaS for building inspection services. | $1M | 123 mo ago | 35 | 2014 | — | — | 2 patents Enterprise capital management software for custom assemblies and schedulable cost lines | — |
| 14 | Quietyme Smart solutions for managing noise, improving patient experience, and property management | $980K | 144 mo ago | 3 | 2012 | John Bialk Founder & CEO | — | 3 patents Real-time disturbance detection and predictive analytics for industrial control systems | — |
| 15 | OneEvent Technologies Patented predictive analytics engine for building and home monitoring | $415K | 117 mo ago | 892 | 2014 | Kurt Wedig Founder & CEO | Cart FunctionalityWordPressMySQL+30 | 18 patents Patents concentrated in computing, sensing & instrumentation | — |
| 16 | InStepNanoPower Wearable solution that can convert mechanical energy into electrical energy | $298K | 192 mo ago | — | 2010 | Tom Krupenkin President & CEO | — | — | — |
| 17 | EWPanel Developer of nanotechnology-based power generators | $225K | 84 mo ago | — | 2016 | Xudong Wang Co-Founder | — | — | — |
Top 12 Energy Tech companies in Wisconsin
#1
Seed · Madison, Wisconsin · founded 2021$4Mraised▾
Developer of flow battery. It is a sustainable energy storage solutions provider that leverages flow battery technology to support the transition to a clean and resilient energy future. It also provides organic redox materials, ion exchange membranes, and grid flow battery systems.
- Nov 2025Seed$4M
#2
Seed · Madison, Wisconsin · founded 2020$7.6Mraised▾
AI-enabled HVAC and refrigeration management solutions. It provides solution to monitor and prevent refrigeration outages, reduce wasted supplies and dangerous food spoilage.
- 2025Seed$4M
- Mar 2024Seed$3.5M
- Dec 2023Seed$4.1M
#3
Series B · Milwaukee, Wisconsin · founded 2017 · 13 employees$20.4Mraised▾
Provider of solutions for hydrogen generation. It provides electrolyzer modules for industries to generate clean, safe, and low-cost hydrogen.
- Jan 2025Series B$6.7M
- Nov 2024Series B—
- Jul 2023Series B$16.7M
- Aug 2022Grant (prize money)$500K
#4
Series A · Pewaukee, Wisconsin · founded 2009 · 17 employees$8Mraised▾
Electrification solutions for work trucks, reducing emissions and fuel costs. The company provides a patented work fleet electrification platform supporting a wide range of medium and heavy-duty vehicle types. Their system powers primary functions and auxiliary equipment without a generator, suitable for diesel, EV, or CNG trucks. The focus is on quieter, cleaner, and longer-lasting operation. The company's plug-in hybrid system allows trucks to operate on both an internal combustion engine and battery power. The system is independent of fuel type, reducing carbon emissions and decreasing fleet fuel costs and maintenance needs, all while providing sustainable energy solutions. The company serves utilities, municipalities, electric cooperatives, telecommunications companies, and other commercial work truck markets. The company's technology enables hybrid drive systems, ePTO, and idle reduction, with fast ICE-to-battery recharging. They offer software for remote monitoring and updates.
- May 2025Grant (prize money)$2.1M
- Mar 2018Series A—
- Jul 2012Series A—
- Aug 2011Grant (prize money)$2.9M
#5
Seed · Janesville, Wisconsin · founded 2015 · 2 employees$5.3Mraised▾
Manufacturer of lithium-ion batteries for industrial, stationary, and mobile applications. The company engineers solutions for automated guided vehicles, autonomous mobile robots, and forklift equipment. Custom solutions are available for unique industrial battery requirements. The modular design allows for rapid servicing and improved performance in extreme environments.
- Oct 2024Seed$2.6M
- Mar 2022Seed$3.1M
- Jun 2021Seed$1.5M
- Apr 2020Seed$749.3K
#6
Funding Raised · Milwaukee, Wisconsin · founded 2013 · 4856 employees$500Mraised▾
Manufacturer of advanced low-voltage batteries and related energy storage solutions. The company provides batteries for automotive, commercial, powersports, and leisure applications. It offers flooded, AGM, lithium-ion, supercapacitors, and sodium-ion battery technologies. The company also provides connected services and multi-battery systems.
- May 2020Conventional Debt$500M
#7
Funding Raised · Pine River, Wisconsin · founded 1998$20Kraised▾
Developer of radiant heating system designed for multiple heat sources. The system streamlines in-floor heating installation, replacing complex plumbing with a compact solution. It works with electricity, heat pumps, and solar energy. The company offers consultation services to help build facilities.
- Jun 2025Grant (prize money)$20K
#8
Public · Holcombe, Wisconsin · founded 1992 · 60 employees$53Mraised▾
Encorp manufactures integrated hardware and software systems for the distributed energy market. It provides a suite of software applications that allows users to control and monitor distributed energy assets and demand response. It also provides family of controls The Gold Box™ for single or multiple generators, the Utility Power Control™ for utility interconnect control, and the Meter Monitor Control™ for metering and monitoring applications for smart communications. It caters its products and services for micro grid to connect distributed energy systems.
- Oct 2004Series D$1.4M
- Apr 2004Series D$7.1M
- Oct 2001Series D$38.1M
#9
Acquired · Milwaukee, Wisconsin · founded 1999 · 27 employees$24.6Mraised▾
Provider of HVAC energy management solutions for commercial spaces. It offers EcoSmart products, along with the EcoCentral management platform that helps to reduce energy consumption, HVAC runtime, and utility costs in most building environments. Its app is available for Android devices.
- Feb 2016Grant (prize money)—
- Oct 2014Conventional Debt$2M
- Apr 2011Series A$1.4M
- Aug 2010Series A$1.3M
#10
Acquired · Madison, Wisconsin · founded 2007 · 19 employees$14.9Mraised▾
Developer of nanostructured electorde. They combine organosilicon compounds with nanostructured electrodes and used in energy storage devices such as ultracapacitors,lithium ion batteries and other electrochemical energy storage devices.
- Mar 2019Series B$750K
- Jun 2016Series B$8M
- May 2016Series A$2M
- Nov 2014Series A$3.7M
#11
Deadpooled · Menomonee Falls, Wisconsin · founded 1986 · 64 employees$6.8Mraised▾
Ensync Energy designs and manufactures advanced energy storage and intelligent power control platforms that effectively enable integration of renewable energy sources. EnSync storage and power control technologies are used in grid-tied and grid-independent environments for a variety of applications and markets.
- Feb 2019Conventional Debt$500K
- Oct 2013Post IPO$6M
- Mar 2010Post IPO$280K
#12
Series A · Madison, Wisconsin · founded 2012 · 9 employees$3.4Mraised▾
Offers cooling systems for data centers. Their systems circulate an engineered fluid that, unlike water, poses no risk to computer hardware. It also systems features quiet, reliable centrifugal pumps which eliminate the choice for HVAC.
- Jan 2017Series A$125K
- Jan 2016Series A$2.3M
- Jan 2015Seed$1M
Funding & investor landscape
Notable founders
Market landscape — 10 sub-themes by coverage
Share of Energy Tech coverage by sub-theme.
Regulatory-risk over time rising
Funding & growth over time
funding rising · growth rising
How research on Energy Storage in Wisconsin is moving
A read on the academic research around Energy Storage in Wisconsin — which themes are gaining ground, the institutions and researchers driving them, and how the tone is shifting. Based on 60 papers.
UW–Madison and affiliates lead Wisconsin's optimistic energy-storage research, dominated by battery technologies and microgrid optimization across 60 papers, with breakthroughs and advancements vastly outweighing concerns.
- University of Wisconsin–Madison37
- University of Wisconsin–Milwaukee12
- University of Wisconsin–Green Bay7
- University of Wisconsin–Superior1
- University of Wisconsin System1
- Electrochemistry1→6
- Battery (electricity)2→5
- Renewable energy2→5
- Distributed generation1→3
- Battery (electricity)3
- Renewable energy2
- Energy carrier1
- Electrochemical energy conversion1
- Context (archaeology)1
Common questions
Rohit lives in the feed. He covers what's moving right now — the funding rounds, launches and shifts breaking across the trade press — and ties them back to where the sector is heading.