About us
We take responsibility for onsite power, so you can focus on running your business.
ONENSYS stands for Onsite Energy Systems. We provide complete onsite power services where the grid is unavailable or insufficient and conventional generators are restricted by emission or noise requirements.
We’ll get in touch to understand your needs and assess whether one of our solutions could be the right fit.
Reliable onsite power, without the complexity
Our customers need more than equipment. They need dependable power that keeps projects moving, production running and charging capacity available.
ONENSYS combines the H2-Powergen, hydrogen supply and operational support into one coordinated onsite power solution. One partner. One setup. Reliable power where you need it.
Solutions built around your energy challenge
We configure the system around your power demand, site conditions and operating profile, then coordinate deployment and ongoing operation.
Configure
Deploy
Operate
1. Configure
We assess your requirements and determine the appropriate H2-Powergen setup and hydrogen supply.
2. Deploy
We coordinate delivery and the practical onsite setup required to bring the system into operation.
3. Operate
We coordinate hydrogen supply, monitor system performance and provide service, maintenance and operational support throughout the project.
Meet the team
We are a dedicated and hands on team with expertise in energy systems, engineering, project development, business development and operations.
What connects us is a practical mindset and a shared ambition: making onsite energy reliable, clean and understandable for our customers.
Interested in joining us? Explore our careers page.
ONENSYS Management
Hugo Groenemans
CEO/ owner
Maaike Los
CFO
Remco van der Horst
CCO
Huib Hupkens van der Elst
CTO
Frequently asked questions
The grid connection for my project is delayed — can ONENSYS provide power in the meantime?
Yes — this is one of the most common situations we solve. We assess your power demand and configure an onsite energy system that delivers the capacity you need while the grid connection is unavailable, insufficient or not yet ready, so your project can start on time.
Do I need a fixed grid connection to use an ONENSYS system?
No. Our systems operate off-grid and grid-connected. For temporary and mobile projects we provide reliable power without depending on fixed infrastructure, and the setup can move with your project.
My site must meet zero-emission or Natura 2000 requirements. Is that possible without stopping work?
Yes. We configure zero-emission onsite power that supports compliance with Natura 2000 restrictions, SEB requirements and procurement criteria — without bringing your operation to a halt. Where conventional generators are no longer allowed, this is exactly the gap we fill.
I'm not sure which challenge applies to my project. How do I find out?
Many projects face several overlapping constraints: limited grid capacity, emission requirements and tight timelines. Contact us to assess your onsite power challenge. We evaluate your energy and power demand, grid situation and emission requirements, then explore the right power setup for your site.
Can ONENSYS guarantee system performance?
Depending on the project and operating requirements, ONENSYS can agree contracted performance levels covering areas such as power availability, monitoring, maintenance and service response. The exact commitments and conditions are defined in the project agreement.