Wind farm
Siesbach Süd wind farm: foundation work begins
The infrastructure for the Siesbach Süd wind farm is in place. Construction of the foundations for the three Enercon E-138 turbines starts in mid-October 2026.
Wind farms together with the region
We develop, build and operate wind farms in Germany. In close partnership with municipalities and landowners, we create a sustainable energy supply and long-term prospects for regions and the people who live there.
The GERES-Group in figures
- Since 1995
- Family-owned company from Frankfurt am Main
- 166 MW
- wind power in operation
- 73
- wind turbines in our own portfolio
- 200+ MW
- wind energy planned and permitted in Germany
- 150 MW
- further projects in development
- 50+ MW
- solar energy developed internationally, ready to build
What we do
Five areas, one standard
- 01
Wind energy
Onshore wind farms in Rheinland-Pfalz, Saarland and Thüringen. From the evaluation through expert reports and the permit to construction and operation, we carry out every step ourselves.
Wind energy in detail - 02
Grid infrastructure
Four substations of our own feed the electricity from our wind farms into the grid. Battery storage is being added: it takes up electricity when more is generated than is needed and releases it when the grid needs it. The first system is planned at the Breitenbich substation.
Grid connection in detail - 03
Solar energy
Site evaluation, feasibility studies and permit application planning for ground-mounted solar farms, including the grid connection. Reference: the 8.7 MW plant in Écija, Spain.
Solar energy in detail - 04
A family company in its second generation
Since 1995 we have been developing, building and operating wind farms, now in the second generation. What we build, we keep in our own portfolio. That is why we plan every wind farm for decades.
About the GERES-Group - 05
Rooted in the region
Municipalities benefit through participation models as well as lease and tax revenues. This fair approach to project delivery carries a seal from the Thüringer Energie- und GreenTech-Agentur.
What the region gains
Our turbine technology
Technology that shows consideration
A wind farm should generate electricity while disturbing its neighbours as little as possible. We pay attention to that with every turbine, from the paint to the control system.
Consideration for the neighbours
Quieter at night
Where the permit provides for it, our wind turbines run in a noise-reduced operating mode at night. This reliably keeps the noise at the surrounding homes within the applicable guideline values.
In addition, the rotor blades of modern turbines have special noise-reducing trailing edges. These so-called serrations reduce air turbulence and with it the noise. Newer turbine generations reduce noise emissions further through optimised rotors and lower rotational speeds, while producing the same amount of electricity.
Shutdown for shadow flicker
When the sun is low, the turning rotor blades can cast moving shadows. Where this shadow can fall on homes, an automatic shutdown system records the actual shadow flicker and stops the turbine in time.
Lights only when needed
So that aircraft can reliably make out wind turbines at night, the turbines carry night-time obstruction lighting. Our turbines are operated with demand-controlled night marking: the red warning light only switches on when an aircraft is actually approaching. Modern systems also clearly reduce false alarms and so help to keep light at night to a minimum.
Matt finish
Rotor blades and tower have a matt, light grey finish. It reflects hardly any sunlight, so the turning blades do not flash.
Consideration for nature
Protecting birds
Bird protection begins with the choice of site: breeding sites, resting areas and flight routes are surveyed and taken into account before planning. Depending on the site, further measures are added, for example shutdowns during mowing or harvesting on neighbouring fields, when birds of prey hunt for food there more often.
A pause for bats
Bats mainly hunt on warm nights with little wind. That is exactly when our turbines stand still at the sites concerned. The shutdown times are set by the permitting authority, depending on temperature, wind speed, time of day and season.
Proven technology and safety
No gearbox
Our turbines are made by Enercon and work without a gearbox: the rotor drives the annular generator directly. That means fewer moving parts, less wear, fewer lubricants and less mechanical noise.
Ice detection
In certain weather conditions in winter, ice can form on the rotor blades. Our turbines detect ice build-up automatically, either with sensors on the rotor blade or from deviations in how the turbine is running. The turbine then shuts down by itself and only starts up again once the blades are free of ice.
Monitoring around the clock
Every turbine is monitored continuously by a remote monitoring system, 24 hours a day, 365 days a year. Irregularities are spotted early and often fixed before they lead to a breakdown.
Sitzerath wind farm as a model
Six turbines in the Hochwald
True to scale on the real terrain: Enercon E-115, E-82 and E-40, 12.5 megawatts in total. The blue lines show the wind from the west-southwest, the prevailing wind direction. The rotors turn to face it.
All wind farms on the map
Latest
News from the GERES-Group
Storage
Battery storage at the Breitenbich substation
Next to its own Breitenbich substation, the GERES-Group is planning a battery storage system with an output of 18 megawatts and a storage capacity of 40 megawatt hours.
Industry
BEE launches the Energiewenderechner
In September 2026 the German Renewable Energy Federation published its Energiewenderechner, an energy transition calculator. The GERES-Group supported the project.
Award
Awarded the ‘Faire Windenergie’ seal
The Thüringer Energie- und GreenTech-Agentur (ThEGA) has awarded our comprehensive project delivery the ‘Faire Windenergie’ seal. The assessment covers community participation, transparency and fair involvement across the entire project development phase.
What lies behind the seal
Büttstedt wind farm
Evening light in the Eichsfeld