Reference yield

Reference yield according to TR5 & TR6

Benchmark for your EEG remuneration

The reference yield is the key statutory calculation parameter used to compare the performance of different types of wind turbine. It defines the theoretical energy yield that a turbine would achieve at a standardised reference location over a period of five years.

This value is indispensable in the current EEG tendering system. It is the fixed denominator in the equation that determines your income: the ratio of your specific site yield to the reference yield determines the site quality. This, in turn, directly affects the amount of your feed-in tariff via correction factors.

Our accreditation

Determination & methodology

The calculation requires the utmost care and precision. As a DAkkS-accredited testing laboratory, we will determine the reference yield strictly in accordance with the FGW e.V. technical guidelines:

The standard case: We use an independently measured performance curve under the legally defined reference wind conditions.
The special case (replacement reference yield): If no measured performance curve is yet available for a new type of plant, we calculate a replacement reference yield based on the manufacturer’s specifications in accordance with TR5.

Whether standard or special case: We provide you with the legally compliant values you need for your calculations and for verification by the authorities.

Inquire directly

Once you have placed your order, please send us all the necessary information, as well as the wind measurement and yield data.

We determine the reference yield precisely in accordance with the TR5 specifications. To ensure maximum accuracy, we use site-specific wind models and validated methods.

All results are summarised in a clear and concise PDF.

We will send you the document as soon as it is ready.

EEG-Evolution

Introduction

EEG 2000

The first Renewable Energy Sources Act (EEG) introduced the two-stage reference yield procedure. The aim was to create a fairer system by making locations with weaker winds economically viable.

Remuneration

Initial remuneration

In the original model, the ratio of the actual yield to the reference yield determined how long the initial remuneration would be increased for. The worse the location was in comparison to the reference location, the longer the operator received the higher subsidy rate. Therefore, the reference yield set the pace for the duration of the subsidy.

System change

EEG 2017

With the introduction of the tendering system, the change to a single-stage procedure took place. Funding is now no longer spread over time, but adjusted according to the amount. The reference yield remains the anchor, but now serves to determine correction factors.

Site quality

Today

The reference yield is now essential for calculating site quality. It is the mathematical constant that determines the surcharge value that a project receives. Regardless of the remuneration model, the physical definition of the reference site remains the technical basis for assessment.

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