enviaM – Conceptual design of a building cost surcharges (BKZ) for RES

Operators of renewable energy facilities are so far exempted from a cost share for the grid connection. Therefore, there is no signal (location incentive) to first build new RE-facilities at places with existing connection capacities in the distribution grid, where no additional grid expansion is necessary.

The idea is hence that operators of RE facilities pay an appropriate amount of a building cost surcharge for the grid connection in areas with connection bottlenecks. On this way, operators bear a share of the follow-up costs that are today only shouldered by the general public. Through this, the necessary location incentives and a spatial steering effect are created.

The goal of the study is it to make a contribution for a regular policy implementation of the building cost surcharge for RE facilities in the distribution grid.

The first step was the development of the concept of the building cost for RE facilities based on the current calculation approach for building cost surcharges in distribution grids.

The positive macroeconomic impact of the concept can be justified by its allocative effect. The allocative effect was thus demonstrated by using concrete examples in the network area of MITNETZ Strom. With exemplary economic efficiency calculations for a wind farm at alternating locations the impact of the surcharge was analyzed.

Both the cost contribution of RE facilities as well as the avoided grid costs through the allocative effect of the measure decrease the costs of the other grid users and hence lead to lower network charges. This positive macroeconomic effect was then calculated for the considered example network areas.

In the project, the concept of a building cost surcharge for RE facilities is developed, applied in concrete case studies, substantiated and evaluated.

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