Keeping an eye on grid capacity
The reductions or shutdown of renewable energy plants due to limited grid capacity is called feed-in management. A delayed grid expansion by the grid providers can be a reason for the need of feed-in management. Since 2009 the German Renewable Energy Act offers the opportunity to invoice the grid providers for feed-in losses.
Invoicing for feed-in losses is based on the German Renewable Energy Act (§12) and the accompanying guideline provided by the Federal Network Agency. Invoicing can be based on two separate methods:
1. The ‘inclusive method” with which the feed-in losses can be calculated with a few data points from the last measured feed-in.
2. The ‘Spitzabrechnungsverfahren’, a method, which calculates the feed-in losses based on theoretical power (using the nacelle anemometer wind speed (NWS) and the wind turbine’s specific power curve).
The inclusive method is often linked to lower invoices while the ‘Spitzabrechnungsverfahren’ is so complex, that it is impossible to complete for an un-trained person.
Dirkshof, as an early pioneer for wind energy in Northern Germany, was one of the first to be impacted by feed-in management and has successfully conducted many invoices since 2009. We were also able to complete ‘Spitzabrechnungsverfahren’ with E.ON in February 2011.
In the meantime guidelines, such as those by E.ON, have simplified the calculation of feed-in losses. Many service providers offer the calculation and invoicing for feed-in losses. However, it is crucial to select an adequate service provider who is able to invoice correctly. With our experience, we are well placed to assist you.
Download presentation BWE (PDF)
Download Excel-Data (Excel)