--- title: Homepage --- [![Logo](https://www.aquastroke.eu/hubfs/Aquastroke%20header%20nieuw.jpg)](https://www.aquastroke.eu/?hsLang=en) [![Logo](https://www.aquastroke.eu/hubfs/Aquastroke%20header%20nieuw.jpg)](https://www.aquastroke.eu/?hsLang=en) [Demo RDM](https://www.aquastroke.eu/en/rdm-demo?hsLang=en) - Technology - Generators - Contact - FAQ - - [English](https://www.aquastroke.eu/en/) - [Nederlands](https://www.aquastroke.eu) ## AquaStroke® Clean backup power, anytime, anywhere! [RDM Demo](https://www.aquastroke.eu/en/rdm-demo?hsLang=en) ## The fossil-free generator for a new standard in emergency power [Learn more](https://www.aquastroke.eu/en/#aquastroke) ![](https://www.aquastroke.eu/hubfs/raw_assets/public/Aquastroke/img/Aquastroke-small-logo.png) **AquaStroke®** is an innovative method of power generation, designed for a future without fossil fuels. This patented engine technology runs on a unique fuel blend of 70% water and 30% bio-alcohol. AquaStroke®delivers **quiet**, **clean**, and **powerful energy,** with significantly lower emissions than conventional generators. **Clean backup power, exactly when needed** The **AquaStroke 35 kW** is a **fossil-free standby (backup) generator** under **SCIOS classification (≤500 hours/year)**, designed to provide **reliable backup** during outages or scheduled maintenance. In partnership with technology partner **MayMaan Research Inc.**, and as part of **Vattenfall**, **Feenstra** is introducing this innovation to the European market. ![STILL_WEB_35_V02](https://www.aquastroke.eu/hs-fs/hubfs/aquastroke35/STILL_WEB_35_V02.png?width=2000&name=STILL_WEB_35_V02.png) [![Aquastroke Assembly vid](https://www.aquastroke.eu/hubfs/Aquastroke%20Assembly%20vid.gif)](https://vimeo.com/914929816/ff8ef628ae) ![](https://www.aquastroke.eu/hubfs/raw_assets/public/Aquastroke/img/Aquastroke-small-logo.png) ### What Makes Aquastroke Unique? ✅ **100% Fossil-Free** – runs on a renewable water and bio-alcohol  blend ✅ **Exceptionally Low Emissions** – no black smoke, no diesel odor ✅ **Low Noise** – suitable for use in residential areas ✅ **Emergency power / standby** — **SCIOS** classified ✅ **Flexible Deployment** – off-grid, mobile, modular, and scalable ![](https://www.aquastroke.eu/hubfs/raw_assets/public/Aquastroke/img/Aquastroke-small-logo.png) ### Technical advantages 🚰 **Patented Water and Bio-alcohol Fuel System** Enables clean, efficient combustion with greatly reduced harmful emissions. ⚡ **High Compression Ratio** Delivers more power and torque with lower fuel consumption. 🌿 **No After-Treatment Required** No particulate filters, AdBlue, or regeneration cycles needed. 🔧 **Reduced Maintenance** Less carbon buildup, cleaner oil, and extended maintenance intervals. 🔌 **Modular & Scalable** Operates independently or in hybrid energy applications. **Note:** Performance and emissions are based on manufacturer data; **independent EU validation** and **CE documentation** will follow / are available for inspection. ![35 inside](https://www.aquastroke.eu/hs-fs/hubfs/35%20inside.png?width=1292&height=848&name=35%20inside.png) ![](https://www.aquastroke.eu/hubfs/raw_assets/public/Aquastroke/img/Aquastroke-small-logo.png) *"The Fossil-Free Generator for a New Standard in Emergency and Mobile Power Supply"* ![](https://www.aquastroke.eu/hubfs/raw_assets/public/Aquastroke/img/Aquastroke-small-logo.png) ### A New Generation of Generators The AquaStroke® generators are suited to situations without grid access or where sustainability is a priority: **For 35 kW (now available as pilot):** 🔹 Emergency / stand-by for critical loads (IT, telecom, pumps). 🔹 Short-duration back-up during outages or maintenance. 🔹 Temporary use (≤500 hours/year, SCIOS). **For 120 kW & AquaVolt (in development):** 🔹 Intended for heavier / continuous applications. 🔹 Hybrid charging solutions / DC fast charging (AquaVolt). 🔹 Projects with higher power demand. *The first models are being prepared and will be tested at pilot locations in the Netherlands from early 2026..* [Check out our generators](https://www.aquastroke.eu/en/#generators) ![aquastroke 35 + aquavolt](https://www.aquastroke.eu/hs-fs/hubfs/aquastroke35/aquastroke%2035%20+%20aquavolt.png?width=2000&height=1125&name=aquastroke%2035%20+%20aquavolt.png) [![video](https://www.aquastroke.eu/hubfs/video.jpg)](https://www.aquastroke.eu/hubfs/maymaan_technology_video_web%20(1080p).mp4?hsLang=en) ![](https://www.aquastroke.eu/hubfs/raw_assets/public/Aquastroke/img/Aquastroke-small-logo.png) ### Cutting-Edge Technology – Proven in Practice The AquaStroke® technology was developed in the United States, where it is already being deployed in pilot projects. In Europe, it is in the final stages of validation and certification. A CE Declaration of Conformity is now available for the 35 kW emergency/stand-by version. Additional documentation and assessment for broader market application are in preparation. According to internal tests conducted in the U.S., MayMaan reports low emission values, with minimal soot formation and combustion temperatures below the NOx threshold of 900 °C. These results are currently being independently validated in accordance with European emission standards and requirements. [Watch the video – see the Aquastroke technology in action.](https://www.aquastroke.eu/hubfs/maymaan_technology_video_web%20(1080p).mp4) ![](https://www.aquastroke.eu/hubfs/raw_assets/public/Aquastroke/img/Aquastroke-small-logo.png) ### Responsible and Realistic Communication AquaStroke® is designed to contribute to the energy transition. Claims regarding CO₂ reduction, emission performance, and cost savings are based on preliminary test results and early field experiences. Independent validation and supporting documentation are underway. We are committed to transparency and welcome you to follow the continued development of this innovative technology. ![aquavolt max windmill](https://www.aquastroke.eu/hs-fs/hubfs/aquavolt%20max/aquavolt%20max%20windmill.png?width=1920&height=1080&name=aquavolt%20max%20windmill.png) ![Aquastroke 120 - 3](https://www.aquastroke.eu/hubfs/aquastroke%20120/Aquastroke%20120%20-%203.png) ![](https://www.aquastroke.eu/hubfs/raw_assets/public/Aquastroke/img/Aquastroke-small-logo.png) ### availability 🔵 **AquaStroke 35 kW** – emergency/stand-by – pilot introduction Q1 2026 🔵 **AquaStroke 120 kW** – powerful industrial generator (2026) 🔵 **AquaVolt Max** – 120 kW generator with integrated DC fast charger (2026) *Want to be the first to receive updates on progress, availability, or to attend a demonstration? Leave your details using the form below.* ## Stay informed #### Sign up for updates, demonstrations, or to be among the first to get in touch when the initial models become available. ### The generators AquaStroke® generators are being developed for a wide range of applications and power ratings. Discover which model best fits your needs. ![Image](https://www.aquastroke.eu/hubfs/Aquastroke-2.png) ### AquaStroke 35 Automatic emergency (back-up) 35 kW generator (SCIOS, ≤500 hours/year) 35KW 230V / 400V - 50Hz Equipped with a 2.3 L turbo engine Manufacturer: Ford Model: Duratec 4-cylinder [View this model](https://www.aquastroke.eu/en/product/aquastroke35?hsLang=en) ![Image](https://www.aquastroke.eu/hubfs/Aquastroke-2.png) ### aquastroke 120 Automatic Standby and Primary Power 120kW Generator 120 kW | 230V / 400V - 50 Hz Powerful 6.2 L Naturally Aspirated Engine Manufacturer: GM Model: LT1GenV 6.2L [View this model](https://www.aquastroke.eu/en/product/aquastroke120?hsLang=en) ![Image](https://www.aquastroke.eu/hubfs/Aquastroke-2.png) ### AquaVolt Max Automatic Standby and DC fast-charger up to 250 kW 120 kW | 230V / 400V - 50Hz 6.2 L engine + DC fast-charge Manufacturer: GM Model: LT1GenV 6.2L [View this model](https://www.aquastroke.eu/en/product/aquavoltmax?hsLang=en) ![](https://www.aquastroke.eu/hubfs/raw_assets/public/Aquastroke/img/Aquastroke-small-logo.png) ### ABOUT US AquaStroke® Europe is an initiative of **Feenstra**, part of **Vattenfall**, in collaboration with the U.S. technology developer **MayMaan Research Inc.** Together, we aim to deliver practical, scalable, and sustainable solutions for today’s—and tomorrow’s—energy challenges. ![vattenfall-windmolens](https://www.aquastroke.eu/hs-fs/hubfs/vattenfall-windmolens.jpg?width=1440&height=960&name=vattenfall-windmolens.jpg) ### Frequently Asked Questions ## What is an AquaStroke® fossil-free generator? The AquaStroke® generator is an innovative power solution that runs on a unique blend of 30% bio-alcohol and 70% water. This fossil-free fuel delivers clean, reliable energy with low emissions – without relying on fossil fuels like diesel or gasoline. ## How Does AquaStroke® Contribute to the Energy Transition? AquaStroke® has been developed as an alternative to conventional fossil fuel systems, aiming to enable cleaner energy generation and potential CO₂ reduction. We communicate transparently about this: claims regarding CO₂ reduction, low emissions, and possible cost savings are based on preliminary test results and field experience, and are currently being further assessed and validated by independent parties. ## Is the 35 kW suitable for prime power or peak shaving? No. The 35 kW is classified as an emergency/standby generator and falls under SCIOS (≤500 hours/year). Applications such as prime power or peak shaving do not apply to this model. For those use cases, please refer to the 120 kW model / AquaVolt (in development). ## How many hours is the 35 kW allowed to run per year? In line with the SCIOS classification, the limit is a maximum of 500 operating hours per year, including test runs. ## When will the 35 kW generators be available? The generators are currently only available through pre-registration. The expected delivery time is approximately 6 months, subject to final approval and completion of additional certification and documentation for the European market. ## Is AquaStroke® CE-Certified? A CE Declaration of Conformity is available for the 35 kW version. Additional documentation and certification for full market deployment in Europe — including emissions and safety assessments in accordance with EU legislation — is currently in preparation. ## Where are AquaStroke® Generators Used? 🔹 **Energy-Limited Areas:** Locations with (temporarily) limited grid capacity 🔹 **Events:** Festivals, concerts, and outdoor activities where quiet, clean power is needed 🔹 **Emergency Backup:** Backup power during grid outages 🔹 **EV Charging Stations:** Temporary or mobile charging stations 🔹 **Construction & Infrastructure:** Power for tools, lighting, and temporary energy needs ## What Are the Benefits of the AquaStroke® Fuel Mix? 🔹 **Fossil-free:** powered by a biogenic ethanol mix derived from renewable sources such as sugarcane or agricultural waste. 🔹 **Lower emissions:** internal tests show virtually no black smoke or diesel odor. 🔹 **No Additional Emission Systems Needed:** No particulate filter or AdBlue required 🔹 **Reduced maintenance:** less carbon buildup and cleaner oil may result in lower maintenance needs. *Note: These benefits are based on internal testing in the US; validation according to European standards will follow later.* ## Do I Need After-Treatment or Additional Emission Systems? Based on internal testing, the clean combustion of AquaStroke® does not require diesel particulate filters, catalytic converters, or AdBlue. *Note: European validation will follow later.* ## How Much Maintenance Does an AquaStroke® Require? 🔹 Fewer Filter Replacements and Regeneration Cycles 🔹 Cleaner Oil for Longer Periods 🔹 Reduced Wear on Engine Components 🔹 Longer Maintenance Intervals and Lower Costs ## Can I Combine Multiple AquaStroke® Generators? Yes. AquaStroke® is modular and can be linked with multiple units or integrated with batteries, solar panels, and microgrids for hybrid applications. ## In Which Sectors Can AquaStroke® Be Used? 🔹 Construction & Infrastructure 🔹 Events & Recreation 🔹 Industrial Applications 🔹 Commercial Buildings 🔹 Medical Applications 🔹 Sustainability Projects 🔹 Off-Grid Locations & Defense 🔹 Transport & Marine ## What is the status of the 120 kW and AquaVolt? These models are in development and intended for heavier/continuous applications (with DC fast charging for AquaVolt). Availability and deployment details will follow after validation and certification. Copyrights © 2025 All Rights Reserved Aquastroke