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Reference time series for photovoltaic installations

Reference measurement methods

Service for distribution system operators 

The majority of photovoltaic power plants are not metered according to production output. Previously, the feed-in for these plants was determined by the distribution system operators based on standard feed-in profiles and submitted to the transmission system operator as a transfer time series for accounting purposes. These standard feed-in profiles do not correspond to actual (weather-dependent) photovoltaic feed-in. This results in discrepancies between the market selling and billing for electricity produced in photovoltaic power plants.

To solve this conflict, the German Bundesnetzagentur (Federal Network Agency) is proposing a reference measurement procedure for reporting relevant billable photovoltaic quantities. TransnetBW has developed a suitable reference measurement procedure that will allow distribution system operators to fulfil the requirements set out by the Federal Network Agency.

The service in detail

The distribution system operator receives a quarter-hourly sum load profile of the photovoltaic feed-in for all non-metered photovoltaic power plants in the applicable grid zone.
The transfer of the reference time series data is conducted via email in ESS timetable format (optionally as CSV and/ or MSCONS file). In addition, the distribution system operator can choose between a daily update (150 EUR/ month) or a monthly report (100 EUR/ month). The service can be provided to all distribution system operators in the TransnetBW control zone. For any inquiries or questions, please feel free to contact the persons listed below.