Scientific support for instruments and measures to accelerate the expansion of renewable energies to achieve climate neutrality by 2045 (UBA climate neutrality)(Wissenschaftliche Unterstützung zu Instrumenten und Maßnahmen zur Be-schleunigung des Ausbaus erneuerbarer Energien für Klimaneutralität bis 2045 (UBA Klimaneutralität))

Duration: 1. April 2023 till 1. April 2026

Funded by: Federal Environmental Agency (UBA)

Project partners: Öko Institut

Project management

Dr. Daniela Fietze (Projektleitung)
Tel: +49-931-79 40 77-25

Dr. Markus Kahles
Tel: +49-931-79 40 77-16

Dr. Nils Wegner
Tel: +49-931-79 40 77-20

Katharina Klug
Tel: +49-931-79 40 77-25

Jonas Otto
Tel: +49-931-79 40 77-276

Frank Sailer
Tel: +49-931-79 40 77-11


The project analyses the central needs in order to ensure a steady and robust expansion of renewable energies (RE) that is necessary to protect the climate. It focuses on photovoltaics (PV) and onshore wind energy, which play a central role in the future expansion of RE. In addition, selected questions for electricity generation from bioenergy will be examined in the context of overarching questions on the use of bioenergy.

Taking into account ongoing legislative and strategic processes, the project aims to identify current obstacles to the expansion of renewable energies and to develop proposals to erase them. These include ideas on the feed-in tariff or strengthening the prosumer segment (self-supply, energy communities, collective self-consumption) or an investigation into further acceleration potential in the designation of land for onshore wind energy.

Furthermore, the project also aims to recognize in advance where relevant obstacles may arise and how these can be addressed. One example is the development of business models for renewable energies without state subsidies.


Markus Kahles, Katharina Klug, Daniela Fietze, David Ritter, Dierk Bauknecht,

Energy Sharing: Bestandsaufnahme und Strukturierung der deutschen Debatte unter Berücksichtigung des EU-Rechts

Kurzbericht, Climate Change | 46/2023, Umweltbundesamt, 3. November 2023