dena network study

from Wikipedia, the free encyclopedia

The Deutsche Energie-Agentur GmbH (dena) commissioned a first study with the title: “Energy-economical planning for the grid integration of wind energy in Germany on land and offshore by 2020” ( dena grid study ). It was created by a consortium made up of the three network operators E.ON Netz , RWE Transportnetz Strom , Vattenfall Europe Transmission , the German Institute for Wind Energy DEWI and the Energy Economics Institute at the University of Cologne . It was financed by associations, wind farm planners , the aforementioned operators of the public power grids and the German Federal Ministry of Economics and Labor . On February 18, 2005, after controversial discussions in a project steering group, the study was accepted by those involved and then presented to the public.

In March 2017, Dena published a new study on the “Optimized use of storage systems for network and market applications in the power supply” under the title dena-Netzflexstudie.

Assumptions

The starting point of the study is an assumed expansion of renewable energies to at least 20% of German electricity consumption in 2020. An increase in the installed capacity of wind turbines on land to 27.9  GW and at sea of ​​20.4 GW is then expected.

In order to determine the effects that this goal will have on the power grid and the other power plants , scenarios for the years 2007, 2010, 2015 and 2020 were developed. The study has shown that the results for the period after 2015 are not predictable with sufficient confidence. Negotiations about a second network study dragged on from mid-2005 to at least autumn 2006.

Expansion of the power grid on land

The already existing high voltage grid has to be expanded by 5% on land. By 2007 that is 275 km, by 2010 550 km and by 2015 another 415 km.

Effects on conventional power plants

CO 2 emissions

The planned expansion of the use of wind energy can avoid additional greenhouse gas emissions from conventional power plants as a result of the planned phase-out of nuclear power . A decrease in CO 2 emissions can only be expected if one takes into account the cost of emission certificates and the rising price of energy resources .

Control and reserve power

The study determined a significant increase in the demand for control and reserve power up to 2015 (with over 7,000 MW, more than tripling compared to 2003), but this can be fully covered by the relieved power plant fleet and its operating mode. This requires no additional power plants to install and operate. On the contrary, thanks to the secured output of the installed wind energy capacities, around 2,000 MW of conventional power plant output can be replaced in the long term.

Cost development

The power plant park is shifted towards power plants with lower costs for the invested capital and higher specific costs for fossil fuel . This is countered by the additional costs for the feed-in tariff from the Renewable Energy Sources Act .

In all the scenarios examined, an overall higher cost level was calculated with an inflation rate of 1.5% per year. For non- subsidized electricity consumers, the study comes to 0.385 to 0.475 cents per kWh of additional costs, depending on the scenario, and 0.15 cents per kWh in 2015 for subsidized consumers.

A study by WestLB from 2010 comes to the conclusion that new coal-fired power plants are rarely economically viable under the new conditions of emissions trading and the expansion of renewable energies:

“Under today's general conditions on the German electricity market, investments in large fossil fuel power plants often no longer pay off. (...) An expansion of renewable energies has the effect of lowering electricity prices on the electricity exchange. This leads to a deterioration in the yield of all power plants that have to assert themselves on the electricity market. (...) The increased investment of the large electricity suppliers in renewable energies is (...) to be seen as the economically correct step. "

Complete bibliography of the study

Consortium DEWI / E.ON Netz / EWI / RWE Transportnetz Strom / VE Transmission (Ed.): Energy planning for the grid integration of wind energy in Germany on land and offshore by 2020. Concept for a step-by-step development of the power grid in Germany for connection and integration of onshore and offshore wind turbines, taking into account generation and power plant developments as well as the required control reserve . Cologne February 24, 2005.

Web links

Individual evidence

  1. ↑ dena Netzflex Study - Optimized use of storage systems for network and market applications in power supply (PDF) Dena, March 2017
  2. ↑ climate-mainstreaming.net ( Memento of the original from September 27, 2010 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. accessed in February 2013 @1@ 2Template: Webachiv / IABot / www.climate-mainstreaming.net