GEO-NET Umweltconsulting GmbH

Booth number M 30-17

GEO-NET provides wind resource assessment for project developers, investors, IPPs and off takers since more than 25 years - in South Africa, Africa and world wide.

About us

GEO-NET provides wind resource assessment for wind power development:

  • Site scouting

  • Wind measurement campaigns

  • Wind & energy yield assessment

  • Site & turbulence assessment

  • Technical due diligence

Headquartered in Hanover, Germany, GEO-NET is active in South Africa since more than 12 years. Due to the increased demand, we opened a subsidiary in Cape Town in 2020 to facilitate business and commit to the South African market. Up to now we run more than 30 wind measurement campaigns and energy yield assessments.

What sets GEO-NET apart from the competition:

  • accreditation according to IEC61400-12-1, MEASNET and TG6 improves bankability

  • Advanced CFD-Model FITNAH-3D: high accuracy even in complex terrain, explicit modelling of forests, bushes, settlements, and further obstacles

  • Vast experience from 25 years and more than 4000 projects worldwide

  • Continuous validation and improvement of our model FITNAH-3D in round robin tests and research projects with renowned research institutions

GEO-NET Umweltconsulting GmbH
Grosse Pfahlstr. 5a
30161 Hanover

Phone: +49 5113 887200

GEO-NET South Africa (Pty) Ltd.
4th Fl. De Waterkant Centre, 9 Somerset Rd.
8001 Cape Town Western Cape
South Africa


Products and Services

Wind farm project services:

  • Accredited wind and energy yield assessments

  • Wind potential studies

  • Site identification for potential wind farm sites

  • Design, implementation and analysis of wind measurements using mast,
    LiDAR and SoDAR

  • LiDAR and SoDAR verifications on own 200m verification mast

  • Verification of stability according to DIBt 2012

  • Operating period analyses

  • Site-specific calculation of time series with high temporal and spatial resolution

  • Repowering database

  • Technical due diligence

    GEO-NET offers high quality and reliable expertise guaranteed by the accreditation according to DIN EN ISO/IEC 17025:2017 (DAkkS* 1 , ILAC* 2 ) and internal quality management
    (DIN EN ISO 9001:2015 (TÜV Nord)). As certified and accredited laboratory, GEO-NET follows the national and international technical guidelines and standards of the wind industry.

    GEO-NET is recognized by banks and public authorities worldwide, ensured via the ILAC Mutual Recognition Agreement (ILAC-MRA).
Wind and energy yield assessments

Modelling of the 3D wind field with the globally applicable mesoscale model FITNAH-3D.
Assessment of energy yield depending on hub height and power curve of the respective converter
Validation and verification of the results by long term correlation / long term prognoses and use of pre-checked reference data (weather stations, special measurements, energy yield data of existing WTGS)
Representative expert reports for project developers / project buyers / banks

Further reading

Wind Measurement Campaign with mast or LiDAR

Wind measurement campaigns performed by GEO-NET up to 160m height.
Conception, organisation and realisation of wind measurement campaigns with LiDAR or Mast
Accredited according to DIN EN ISO/IEC 17025:2018
FITNAH-3D based selection of measurement site
Use of calibrated anemometers, wind vanes and data logger
Remote data transmission via GSM/GPRS modem
Preparation, analysis and interpretation of measured meteorological parameters
Bankable final report

Further reading

Site identification for potential wind farm sites

GIS-based assessment of the optimum location for your planned wind farm project considering:

Wind conditions
Environmental restrictions (e.g. protected areas)
General restrictions (e.g. aviation safety, distance to settlements)
Site characteristics (terrain conditions, proximity to surrounding infrastructure, substations, etc.)
Classification of identified sites by definition of individually selectable criteria.

Further reading

News & Innovations

New 200 m mast for LiDAR verification and research

Bigger, higher, stronger - what applies to sport also applies to the wind industry. With greater hub heights, larger rotors and more powerful generators, windturbines are becoming ever more efficient, windpower ever cheaper, and thus windenergy is making an increasingly important contribution to climateprotection and security of energysupply. To support this progress and reduce risk and uncertainties in the energy yield assessment for such projects GEO-NET now installed a new 200 m metmast for LiDAR verification and research in North Germany.

The relevant standard MEASNET prescribe a verification of remote sensing devices (RSD) such as LiDAR and SoDAR devices at least at three quarters of the planned hub height. However, uncertainties can be further reduced by a higher measurement, which of course must also be verified at the corresponding height. In addition, more data is obtained over a larger part of the rotor circle - which is particularly interesting for large rotors, where the wind shear results in quite different wind conditions between the upper and lower rotor ends, causing additional loads on the rotor blades, bearings, shaft etc.

The devices verified by GEO-NET can be used for bankable wind measurement campaigns, energy yield assessments, AEP-reports, FESR etc., and help to reduce uncertainties, thus making it possible to finance certain projects in the first place. GEO-NET is internationally accredited for all these services and keeps this accreditation up to date.

160m Mast Wind Measurement Campaign

GEO-NET installed the first two 160 m met masts in SouthAfrica for wind and energy yield assessments for their customer. These are the highest wind measuring masts in South Africa for wind farm development.

Technology in the wind power business is advancing rapidly. Today’s turbines boast hub heights of up to 160 m and more, which was hard to imagine in the early days of wind power. But the higher the distance between met mast and turbine hub height, the higher the uncertainties in the energy yield assessment in the development phase.

Higher uncertainties lead to higher risk, and that is what investors, lenders and banks want to avoid. Thus, these projects are usually financed on the P75 or even P90 value of the energy yield (which is the value of the energy yield which will be matched or exceeded with a 75 % or 90 % probability).

A higher uncertainty leads to a lower P75 / P90 level of the energy yield – and in low wind conditions this could be the end of a project, even if the average wind speed (P50) would be sufficient. For two of such projects, far away from the stormy coasts of the Western and Northern Cape, GEO-NET installed the two 160 m masts.

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