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Online introduction of how a photovoltaic plant was implemented on the roof of a metro station in Vienna

Meet an expert online from Wiener Linien on 31st May and learn about the experiences in implementing a photovoltaic plant on the metro station Ottakring within the EfficienCE project. Participants will have also the opportunity to watch several videos about the pilot sites and ask questions from the experts.

Registrer HERE

More information HERE

Online event about the implementation of pilots in Pilsen, Maribor and Gdynia

Meet experts in energy-efficiency in public transport from PKT (trolleybus operator in Gdynia), PMDP (public transport operator in Pilsen) and University of Maribor virtually, and learn about their experiences in demonstrating recovery of braking energy, stabilization of trolleybus-grid via buffer storage station, and e-fast-chargers within the EfficienCE project. Participants will have also the opportunity to watch several videos about the pilot sites and ask questions from the experts.

Registrer HERE

More information HERE

E-course on energy-efficient public transport infrastructure technologies deployment is launched

The Interreg Central Europe project EfficienCE aims at increasing energy efficiency and renewable energy usage in public transport (PT) infrastructures to reach local, regional, and EU energy targets. EfficienCE takes up the need of improving energy-efficiency of PT infrastructures to exploit the untapped potentials in this sector. Therefore, 12 partners including 7 PT authorities/ companies from 7 different Central European countries are working together on strategies for planning, financing, and deploying energy-efficient PT infrastructures and innovative energy saving technologies, and on strengthening the capacity of the PT sector by providing knowledge resources.

In this framework, the project is organising an online course on energy-efficient public transport infrastructure technologies deployment, aiming to enable public transport operators/ companies, as well as practitioners at public administrations, to learn about the concept and practical implications of different technologies. The participants are introduced to the overall topic, given examples of technologies and solutions available and tested in (Central) Europe, and will have access to specific use cases based on the evaluation of pilot actions deployed during the project on the main topics of the EfficienCE project: 1) energy efficiency for depots, 2) multipurpose PT infrastructure use & 3) energy storage in PT infrastructure.

The online course starting on 29 March 2022 and ending on 20 May 2022 is structured into three main components:

  1. State of the art and successful technologies
  2. Best practice examples inside and outside EfficienCE
  3. Use cases based on the EfficienCE pilots

Registration is still open HERE

EfficienCE: Open call to hardware and solutions providers to present their products for energy efficiency on the marketplace

As part of the Interreg EfficienCE project and its online repository the project’s consortium is incorporating an open marketplace that fosters the exchange of new technologies and pieces of equipment.

The implementation of energy efficiency measures in public transport requires hardware and often hard-to-acquire, complex technological equipment and special solutions.

The EfficienCE marketplace aims to give an overview on niche hardware and solutions supporting planning and monitoring energy-efficient public transport infrastructure.

Therefore, we are calling to providers in the field to populate the marketplace to allow finding new technologies and pieces of equipment in and outside Central Europe. If you are interested in presenting your technologies and solutions on the EfficienCE marketplace, please contact Lisa Blondrath ( with the name of your company, a short description of your product(s), its application area and target groups.

Webinar: “Multipurpose usage of public transport infrastructure”

How can different vehicle types and actors use public transport charging infrastructure efficiently? How can green and locally produced energy be fed into the grid? How can this be planned for? And what can we learn from current innovative research projects about this fascinating topic? Join us at our webinar to understand more and discuss with the speakers on 9 December 2021 from 10:00 to 13:00!

The joint event of the Interreg Central Europe EfficienCE and Alpine Space e-SMART projects will dive deep into planning, implementation and research related with piloting and testing solutions for multimodal and multifunctional charging bus stations and their integration with the existing urban transport network. The Municipality and University of Maribor and Piedmont Region will speak about their local and regional approaches to planning, while the public transport operator Turin (GTT) presents its pathway towards implementing a multifunctional network open to different users. The University of Gdansk presents experiences and plans of PKT Gdynia how to make their trolleybus grid green, and TU Delft shows simulation results for multipurpose use of the trolleybus network in Arnhem including an outlook on integration of local renewable energy. The webinar is completed with a presentation by the e-lobster project by University of Birmingham on how to use traction power supplies to charge electric vehicles.

Register here

Webinar held on Public transport as a driver of the energy transition in the transport sector

The Transnational Webinar titled „Public transport as a driver of the energy transition in the transport sector” took place within the Interreg EfficienCE project during the European Week of Regions and Cities event on the 12 October 2021. Marlene Damerau from Rupprecht Consult welcomed the participants, followed by an introduction to the aims and objectives of the EfficenCE project (ppt).

The presenters answered the question from different perspectives of how public transport can actively contribute to increasing the share of renewable energy in electric public transport operations.

  • Marta Woronowicz from PKT (trolleybus operator, Gdynia) talked about the results of the test implemented within the Interreg EfficienCE project: the usage of braking energy from trolleybuses and the trolleybus grid for better energy management (ppt)
Photo: Mobile charging station for electric cars powered by the trolleybus network (PKT)
  • Lukas Kerschhaggl from Wiener Linien talked about the results of the installation and performance evaluation of a foil-based photovoltaic system on the roof of a Metro Station in Vienna (ppt)
  • Stefano Zenoni from the Municipality of Bergamo talked about the importance of the sustainable mobility nowadays and in the future in the City of Bergamo, Italy (ppt)
Photo: The City of Bergamo has inaugurated the Circular Electric Line (C line) in 2018 (Municipality of Bergamo)

More information about the event can be found on the Interreg EfficienCE website

Background photo: Municipality of Bergamo

Join us at EU Regions Week: Public transport as a driver of the energy transition in the transport sector

The workshop takes place online, 12 October 2021, 14:30-16:00, and is organised by the EfficienCE project

In contrast to the decrease in CO2 emissions in other sectors, transport emissions have remained nearly constant or have even increased. It is widely known that a systemic transformation of the transport sector is needed by introducing policies and mechanisms that: reduce traffic, increase the share of environmentally-friendly modes of transport and improve vehicle technology. Public transport has a key role to play here by making trips more efficient and by supporting the electrification of vehicles and use of alternative fuels. However, the question how public transport can actively contribute to increasing the share of renewable energy in electric public transport operations is not widely discussed.

In this session, we will present responses to this question based on planning strategies and pilot results of the Interreg CE EfficienCE project, and provide policy recommendations.

The event is moderated by Dr. Wolfgang Backhaus (Leader Collective & Intelligent Mobility Team, Rupprecht Consult). Speakers are:

Lukas Kerschhaggl (Energy and resource management of buildings, Wiener Linien)

Kristina Haverkamp (Managing Director of Deutsche Energie-Agentur GmbH, dena)

Marta Woronowicz (Project Manager and Public Relations Officer, PKT Gdynia)

Stefano Zenoni (tbc, Councilor for environment and mobility, Municipality of Bergamo)

Register here: Public transport as a driver of the energy transition in the transport sector – 12WS21706 (

In Gdynia you can charge a car thanks to trolleybuses

The first mobile charging station for electric cars powered by a trolleybus network was built in Gdynia. It is a joint project of the City of Gdynia and the municipal trolleybus transport operator PKT. A press conference was held on the 9th June at the PKT headquarters about this unique mobile charger, which will use recovered energy from the braking of trolleybuses.

Gdynia is one of the three cities in Poland that use the advantages offered by trolleybus transport. Therefore, the city of Gdynia and PKT have completed two EU projects by implementing and testing an innovative solution, a mobile charging station for electric cars, powered by the trolleybus network. 

Photo: Mobile charging station for electric cars powered by the trolleybus network (PKT)

– Today we are implementing a device for testing, which is not available for residents during the testing phase, but we hope that after it everyone will be able to use the service. It is quite an unusual device that allows for the installation of a mobile charger for electric vehicles. This kind of charger is not permanently connected to the ground and can be moved wherever we have a traction network, and uses energy that has been generated in the recuperation process – said Mrs. Katarzyna Gruszecka-Spychała, Vice Mayor of Gdynia for economy at the press conference.

An energy storage inverter has been designed and constructed by PKT within the EfficienCE project (Energy Efficience in Public Transport Infrastructure – INTERREG Central Europe), which is a device for processing excess braking energy and traction power. It allows for capturing excess energy generated by the braking of trolleybuses from the grid, and for the management of this energy. Interestingly, the inverter uses a used battery that will serve as an energy storage.

On the other hand, a mobile charging station for electric cars was built as part of the project CAR (Creating Automotive Renewal – INTERREG South Baltic) by the city of Gdynia, allowing them to be charged with different ranges of power and electric current.

The synergy effect of the projects is a station that can be connected to the trolleybus traction network anywhere in the city. A prototype storage energy inverter with a connected mobile charger for electric cars was launched in June at the parking place of Gdynia trolleybus depot.

Photo: Energy inverter implemented within the INTERREG EfficienCE project (PKT)

For more information, read the whole article.

Press release article authors: 

  • Marta Woronowicz – PKT GDYNIA
  • Maurycy Rzeźniczak – City of Gdynia
  • Paweł Kimel – City of Gdynia

Cover photo: PKT

Rationalisation of the electric public transport system in Maribor

The Municipality of Maribor commissioned experts from the University of Ljubljana to prepare a study about the best economic and technical solutions for the electrification of bus line no. 6 in Maribor to achieve sustainable goals and improve air quality in the city. 

Photo: The latest test of the electric bus MAN Lion's City E in Maribor (Municipality of Maribor)

The results of the study are as follows:

  • All associated costs for the electrification of bus line No. 6 in Maribor are lower than the purchase of new buses with diesel engines. The purchase of an e-fast charger for e-buses is more efficient than slow charging solutions, such as overnight charging of e-buses, considering the length and altitude difference of bus line No.6.This is the most reasonable way is to install two fast charging stations with at least 150kW or one charging station with at least 300kW. For occasional charging, the most efficient way is smart charging, which allows the level to be maintained in the appropriate phase to keep the battery in good condition. Fast charging stations at bus route termini should allow top-down charging with pantographs.
  • The bidder for e-buses should offer to calculate the cost for the entire life cycle of the battery. The e-bus procurement tender should allow for sufficiently neutral technological requirements to allow bidders to choose different technological solutions that offer the most favourable battery and bus life cycle within the tender.

The study also analysed the characteristics of different types of batteries, namely LTO (Lithium – Titanate), NMC (Lithium Nickel Manganese Cobalt Oxide) and LMP (Lithium Metal Polymer).

For more information, visit the Interreg EfficienCE website. 

Author of the article: Municipality of Maribor, University of Ljubljana

Cover photo: Municipality of Maribor


This online workshop will explore different energy efficient solutions developed in metro stations, focusing on energy monitoring tools. During the webinar participants will have the opportunity to have a look at the solution (a foil-based photovoltaic system on the roof of the Ottraking metro station) carried out by Wiener Linien within the Interreg EfficienCE project through a virtual site visit. More information on the Interreg EfficienCE website

Join us and register HERE

For the agenda, click HERE.