Aerial view of a commercial building with a photovoltaic system, with two people sealing a project with a handshake in front of it

EEFA GmbH · Projects with impact

References

From commercial rooftops to open spaces: our projects show how renewable energy works economically in practice.

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Recent references

Freshly completed in our region

Three projects from autumn 2026 – from a battery-buffered fast-charging park and a photovoltaic system on a hall roof to a connected energy concept with storage and charging infrastructure.

Battery-buffered ELMI HUB 400 fast charger at Regiomarkt24 in Lastrup-Hemmelte with two charging cables

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up to 400 kWCharging power

Charging infrastructure · Lastrup-Hemmelte

Regiomarkt24 fast-charging park

Our first fast-charging park is in operation: at Regiomarkt24 in Lastrup-Hemmelte, electric vehicles charge at a battery-buffered ELMI HUB 400 fast charger. The integrated storage buffers the energy and releases it at high power during charging.

Fast chargingBattery storageCalibration-law compliant
  • ELMI HUB 400 – battery-buffered fast charger (DC/DC)
  • Charging power up to 400 kW
  • 2 charging points
  • Operated by Regiomarkt24
  • Commissioning: October 2026
More on battery-buffered fast chargers
Opened charging station showing the power electronics
Battery storage unit of the fast-charging park on its foundation
Opened battery storage unit with battery modules and switchgear
Battery storage of the fast-charging park in the evening light
Riding hall in Alfhausen with a photovoltaic system on its red roof, oblique aerial view
58.59 kWpSystem output

Photovoltaics · Alfhausen

PV system on a riding hall in Alfhausen

We installed a photovoltaic system with battery storage on the roof of a riding hall in Alfhausen. The solar power from the roof is available directly on site – and the storage makes it usable in the evening, too.

PhotovoltaicsStorageEquestrian farm
  • System output: 58.59 kWp
  • Battery storage: 20 kWh
  • Installation: October 2026
  • Location: 49594 Alfhausen, Germany
More on commercial systems
Aerial view of the riding hall with PV system between fields and trees
Top view of the photovoltaic modules and skylights on the hall roof
Riding hall with PV system from a bird’s-eye view
Farmstead with riding hall and paddocks in Alfhausen from the air
Flat roof of a residential building in Oldenburg with newly mounted photovoltaic modules, aerial view at an angle
28+ kWpTotal PV output

Energy concept · Oldenburg · in progress

Energy concept for a residential building with underground car park, Oldenburg

In Oldenburg we are implementing an energy concept that combines new and existing photovoltaics, a modular battery storage system and future charging infrastructure in the underground car park. A new metering concept with a meter cascade makes sure every energy flow is measured correctly and distributed sensibly.

Current status: DC installation of the 52 modules on the roof is complete. Next come the AC installation, the new meter cabinets with transformer-rated metering and the charging infrastructure with dynamic load management.

In progressPhotovoltaicsStorageCharging infrastructure
  • New PV system: 24.18 kWp (52 modules of 465 W, east-west)
  • Existing system of just over 4 kWp integrated – more than 28 kWp in total
  • Battery storage: 25.6 kWh (5 × 5.12 kWh), modular and expandable
  • New metering concept: meter cascade, new meter cabinets with transformer-rated metering
  • Supplies common-area power, heating power and the heat pump
  • Underground car park: up to 30 wallboxes with dynamic load management, funding approved
  • Location: Oldenburg, Germany
More on energy concepts
Top view of the flat roof with the new photovoltaic modules
Building with photovoltaic modules on the flat roof, aerial view from the front
Residential quarter in Oldenburg with the building and its PV system from a bird's-eye view
Top view of the entire building complex with both roof areas and the PV modules

Our project areas

Where we deliver reference projects

Every project is different – our experience spans four areas that we implement individually or in combination.

Commercial PV

Photovoltaic systems on industrial and company rooftops that reduce energy costs and make businesses more independent.

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Tenant power

Solar electricity from your own roof for tenants – profitable for owners, affordable for residents.

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Solar carports and charging infrastructure

Parking areas that generate electricity and charge EVs – from the wallbox to the fast-charging park.

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Ground-mount & Agri-PV

Ground-mounted solar parks and Agri-PV that intelligently combine agriculture and energy generation.

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More references on request

Your project could be featured here

We are happy to present a selection of further projects to you in person – tailored to your plans, with real figures and hands-on experience from implementation. This way you see exactly the references that are relevant to your decision.

  • References from your project area – from commercial rooftops to open spaces
  • Insight into planning, construction process and ongoing operation
  • Direct discussion on site if desired
Request references

You can reach us on +49 5434 9460 301 or info@e-efa.de – we'll arrange an appointment at short notice, in person or online.

“Good references aren't told on a gallery page – they're shown in operation.”
EEFA GmbH · Renewable Energy for All

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