Source: Energy & Management Powernews , December 22 2022
Billions of kWh of green electricity are regulated annually. In order to give him a little more space, authors of two studies plead for the current-led operation of large CHP plants.
Because of network congestion, billions of kWh of wind power are not produced annually by force and the operators are also compensated for this in billions. 2030 is to amount to the abgegelte quantity of current with further development of the renewable ones alone in the net area of 50 Hertz, which covers East Germany and Hamburg, on 28 billion kWh
Meanwhile Kraft heat coupling (KWK) plants feed also at times highest renewable feed and thus negative electricity prices nevertheless river, because they must cover straight at the same time the district heating need. They are operated on a heat-led basis. Heat storage at the CHP plants, for which the heat is pre-produced in a more grid-serving manner and then delivered with a time delay, is now already promoted in the CHP law, but "an investment push has so far failed to materialize," complains the Mecklenburg-Western Pomerania State Renewable Energy Association (LEE MV) in a report on two publicly funded studies it had commissioned.
The solution from the point of view of the LEE MV and its contractors Fraunhofer Institute for Energy Economics and Energy System Technology (IEE) and Foundation Environmental Energy Law: CHP plant operators with an electrical output of 500 kW or more are to be obliged to set up a heat storage facility in a certain period if they have fed in electricity at hours of negative electricity prices. The Foundation has formulated an additional paragraph, which, according to the stakeholders, should be included in the next amendment of the Energy Industry Act and/or the CHP Act.
In a modeling of the state of Mecklenburg-Western Pomerania, which today can already serve as a blueprint for the 2030 renewables target to a certain extent with its high renewable feed-in, Fraunhofer IEE concludes that with intermediate storage of heat from CHP, 16 percent or 4.5 billion of the 28 billion kWh of green electricity volume that would have to be regulated in the 50 Hertz Transmission control zone in 2030 could then be fed in after all.
CHP plants could then be operated on an electricity-market-led basis and their electricity production could be shifted to times when grid demand is available in the first place and demand and revenues are higher. In one of the modeling exercises, it was found that a 330-MW weekly thermal storage system would pay for itself in just nine years for a small metropolitan area such as the state capital of Schwerin. For a daily storage system for neighborhood supply, break-even can occur in seven to eight years. However, the grid-serving effects of small thermal storage units for the overall system are too small in the eyes of the IEE to argue for mandatory installation.
From the perspective of Stiftung Umweltenergierecht , the overriding constitutional goal of climate protection justifies the encroachments on professional freedom, the guarantee of property, the protection of legitimate expectations and the principle of equality associated with an installation obligation. LEE-MV board chairman Johann-Georg Jaeger concludes, "Generation plants that have been primarily designed for uniform operation are challenged to examine existing concepts."
Author: Georg Eble
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