Earn from the unused capacity on your grid connection
A wind turbine or solar park uses its grid connection only part of the time. We install a battery on the same connection and turn that unused capacity into income. We make the investment, not you.
- of its grid connection's capacity was used by our own solar park in 2024. The rest went unused.
- 9%
- of solar parks in operation, developed or owned by our team
- 11.2 MWp
- of battery storage by our team in operation since 2024 (2 × 1.7 MW / 3.4 MWh); another 5 MWh in development in Dalfsen
- 6.8 MWh
- permit notices for solar, wind and batteries in Powerplaats
- 12,500+
Your grid connection sits idle most of the time
Solar only produces during the day, and wind only when it blows. The rest of the time, the capacity of your grid connection goes unused. Yet that capacity is scarce in the Netherlands: elsewhere, businesses wait years for a grid connection.
Grid room at a glance
One real day on a 6 MW grid connection
- Production
- 53.7 MWh
- Free grid room
- 90 MWh of 144
- Delivered by battery
- 5.2 MWh
Trading pattern: moderate
- Solar power (measured)
- Free grid room
- Delivering
- Charging
- Day-ahead price (no scale)
- Room for the battery
Solar: measured quarter-hour values from our portfolio (2026). Wind: Dutch wind generation, scaled to 6 MW. Prices: Dutch day-ahead. Wind and prices: Energy-Charts (Fraunhofer ISE) and SMARD, CC BY 4.0. The battery pattern is a worked example.
Solar and wind use only part of it
In 2024 our own solar park in Dalfsen generated 4,828 MWh on a 6 MW grid connection: around 9% of what that connection can carry. A wind turbine does better, but it too leaves most of the capacity unused.
A battery fills the gaps
The battery charges when power is cheap or when there is spare capacity, and delivers when there is demand: in the evening, at night and when there is no wind. Your wind or solar power takes priority.
After the SDE, every hour counts
Once your subsidy ends, you receive only the market price. Income from the unused capacity on your grid connection then makes the difference.
Three ways we work
For wind turbine and solar park owners
We install a battery on your grid connection, or take over the management and power sales of your park. We make the investment, not you.
Feasibility, business case and due diligence
Practical advice for developers, investors and large energy users: from site checks and battery business cases to technical due diligence.
Powerplaats
Our own platform with grid capacity, permits, subsidies and market prices for the whole of the Netherlands. We produce reports from it on request.
Dalfsen Solar Park
Our group owns a solar park in Dalfsen (Overijssel). What we advise others, we do there first ourselves: contact with the grid operator, managing maintenance, power sales and now the development of a battery next to the park.
We base our decisions on data
Powerplaats is the development platform of Rhosus Energy. It brings together grid capacity, permits, subsidies, land parcels and market prices, and models solar, wind and battery projects. Every project we take on starts here.
- Grid capacity for feed-in and offtake per grid supply area
- More than 12,500 permit notices for solar, wind and batteries since 2014
- Battery sizing, checked against measured data
- Reports on request, including for your site
Insights
Cable pooling with a battery: is it allowed, and what to agree
Can a battery share your wind turbine or solar park's grid connection? Yes, under the Dutch Energy Act. The rules, the ACM notification and what to agree.
Grid congestion and battery storage: when does a battery help?
What grid congestion means for your wind or solar park, how the waiting list works, and when a battery on your existing connection fits and helps.
Battery storage feasibility study: what it should cover
What a good feasibility study for battery storage (BESS) covers: grid, technology, revenue model, permits and risks, so you know if a battery pays off.
Who we are
Rhosus Energy is part of a Dutch group with its office in The Hague. The group also includes the solar park in Dalfsen. Rhosus was founded by an energy engineer with hands-on experience in solar, wind and battery storage in the Netherlands: from development and permitting to commissioning, service and trading.
- Rhosus Holding B.V., Rhosus Energy B.V. and Otte B.V. (Dalfsen solar park)
- Office in The Hague, projects across the Netherlands
- You speak directly with an engineer, not a salesperson
- We visit you on site
- 06 13 80 54 45info@rhosusenergy.com
Tell us about your wind turbine, solar park or project
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