Determination of site quality after commissioning (TR 10)

The site quality must be determined after 5, 10 and 15 years for wind turbines that are subsidized in accordance with the provisions of EEG 2017 and EEG 2021. The remuneration may be adjusted on the basis of this calculation. The site quality after commissioning is determined according to the calculation rules of Technical Guideline 10 (TR 10). Accredited reports on site quality after commissioning may only be prepared by testing laboratories that have passed the latest round robin test.
The basis for the calculation is the operating data collected over the past 5 years. Time series recorded directly by the plant control system (SCADA), plant-specific status messages and other information, e.g. from operational management, are used here.

Required data are:

• Data from the system control system (SCADA data)
• Certified or project-specific allocation lists
• Status information, operational management information (logbook)
• Technical system documentation
• EinsMan settlements, DV settlements, etc.
• If possible, feed-in meter data or billing code of the energy quantities fed in
• and further information...

Based on this input data, all time steps of the averaging interval of the SCADA data (typically 10 min) are assigned to one of five EEG categories. An availability is calculated on the basis of this assignment. The site quality is the ratio of site energy yield and reference energy yield. For each wind turbine type with a specific hub height, the reference energy yield indicates the calculated amount of electricity that would be generated at a reference site in five years of operation based on a defined power curve.
Depending on the calculation method used, fictitious energy quantities are then calculated and added to the actual energy quantities generated. These can be, for example, restrictions in operation due to more than 60 hours of maintenance per year, times of fault rectification, data gaps or malfunctions. Restrictions that have already been remunerated elsewhere, for example as part of feed-in management, are not remunerated again and are therefore added to the actual energy quantities generated.

We strongly recommend that you review the data basis in good time. In particular, assigning the time steps to one of the EEG categories can prove to be very complex. It is best to calculate a Forecast of site quality, as we are looking at the entire data basis. For newly commissioned wind turbines, we recommend our brief check of the data basis based on TR 10.

We offer you:

• Many years of experience with SCADA data analysis
• In-house accredited software for determining site quality
• We are always up to date thanks to many years of committee work
• Successful participation in the required proficiency tests
• Possibility of filling data gaps with our high-resolution reanalysis time series (3 km, or site-specific) with a high correlation factor and low RMSE

Technical Guideline 10 for the determination of site quality after commissioning dictates precisely which data must be used to determine the site quality.
Non-compliance with the data basis can lead to long data gaps. We offer you a check of the data basis. We recommend that you carry out the check a few weeks to 1-2 months after commissioning the WTG at the latest.

Your advantages with the quick check Data basis:

• Early detection of missing information
• Avoidance of unnecessary allocation to EEG category 2
• Timely identification of problems
• Correct documentation

Talk to us, we will be happy to help you!