• Work Package 1 – Project Management and Coordination

    Includes everyday project management, financial monitoring, and technical meetings.

  • Work Package 2 - Project Communication and Dissemination

    The communication work package involves a number of activities to be implemented in order to reach the highest possible level of dissemination of project activities and outcomes. The aim is to communicate the project`s main message that PVs in conjunction with storage devices can transform buildings into controllable energy sources, thus making them grid-friendly. PV-ESTIA also aims to communicate that the widespread adoption of PV technologies can be enhanced with the application of energy storage systems.

  • Work Package 3 – Policies and Requirements Analysis

    WP3 defines all technical requirements for PV storage integration in the built environment. Experimental pilot locations will be tested, following proper justification procedure. WP3 activities also include the definition of the exact technical characteristics of each pilot. The main barriers and opportunities that exist in the Balkan Med region will be properly identified. To achieve this objective, a comparative analysis of the current policies in the region related to PV integration in buildings and NZEBs will be performed. Stakeholders’ workshops and targeted meetings in each country will provide valuable input.

  • Work Package 4 – Pilot Activities

    WP4 justifies how each pilot will be implemented, taking into account local regulations and special technical requirements. University of Cyprus will design and test at laboratory scale an innovative management scheme and will also define field implementation specifications. All partners will define common monitoring schemes and set the objectives for data assessment. Based on the data collection scheme, data from all pilots and monitored consumers/prosumers will be collected and processed.

  • Work Package 5 – Development of Tools and Data Analysis

    Within WP5 the consortium will develop two different tools – an online tool addressing consumer and prosumers and an advanced tool for policy makers. Both tools will be based on a generalized model developed by AUTH and will be properly designed to cover the Balkan Med region and to include storage and NZEBs. The online tool will be openly accessible, providing useful consultation to all interested stakeholders for investing in PV+storage hybrids, while the advanced tool for the policy makers will include more capabilities for the analysis (e.g. inclusion of dynamic tariffs/market-based policies). The developed tools will be used for data analysis, using collected data from pilots. The aim is to understand the different load and production patterns and develop characteristic curves for each case. The evaluation of this scheme will be based on quantified metrics that illustrate how “grid-friendly” a building is. Using this analysis, we expect to define the framework for expansion and large-scale application of proposed scheme. Finally, a cost-benefit analysis of the proposed management scheme, along with its validation, will be conducted.

  • Work Package 6 – Policy and Regulations Recommendations

    WP6 wIll propose a set of country specific policy recommendations related to PV and storage integration in NZEBs. The goal of this task is to propose roadmaps, identifying how enhanced integration of PV and storage in buildings will help to reach 2030 RES targets. Policy alternatives will be examined and taken into account.

Enhancing storage integration in buildings with Photovoltaics


European Union’s energy targets for 2030 include the transformation of the building stock to Nearly Zero Energy Buildings - nZEBs. NZEBs are characterized by reduced net-energy demand, where most of their energy needs are met by renewable energy sources, especially Photovoltaics. Consequently, in the following years, a considerable amount of intermittent solar generators will be connected in the electrical grid posing new challenges concerning the secure and reliable grid operation. As the number of NZEBs increases, PV integration in the distribution grids of BalkanMed region will be very difficult, unless buildings become more grid-friendly and policies and regulations are suitably adapted. High PV penetration levels may result in unacceptable stress on the electrical grids during hours with high solar power generation. The most important technical challenges that may arise include overvoltages, overloading of network equipment, and fault protection issues. To effectively address these challenges, the integration of Energy Storage Systems in NZEBs is considered as the most promising solution. 


Enhancing storage integration in buildings with Photovoltaics (PV-ESTIA) is a project funded by the transnational Cooperation Programme Interreg V-B "Balkan-Mediterranean 2014-2020" and co-funded by the national funds.


The primary goal of PV ESTIA project is to:

The main project outputs are:

  • Enhance the integration of Photovoltaics and Energy Storage Systems in the building environment in 5 pilot areas, thus facilitating the transition towards Nearly Zero Energy Buildings.
  • Identify and tackle barriers in PV deployment
  • Provide a new energy management solution for residential and commercial buildings, taking into consideration potential interactions with the electrical grid
  • Transform buildings into a controllable energy source
  • Design and implement proper policies and regulations
  • An innovative management scheme of PV+storage hybrid, making buildings grid-friendlier
  • A generalized model assessing alternative policies related to implementation of such hybrids;
  • An online tool providing profitability estimation of such systems
  • An advanced tool evaluating multiple policy scenarios
  • Set of joint regulation recommendations in the form of roadmap for BM region and joint policy recommendations targeting grid operators and relevant stakeholders 

In the framework of the PV-ESTIA project, the performance of the proposed Innovative Management Scheme will be thoroughly evaluated under real-field conditions. All pilot installations are selected carefully with the aim to examine if and how the size of the Energy Storage Systems and the different geographical conditions affect the performance of the proposed innovative management scheme.


The two groups of pilot installations include the following cities:


First Group of Pilots includes:




The research committee building of the Aristotle University of Thessaloniki has been selected as pilot site for the installation of both 15 kWp PV system and 15 kWh ESS. Thе building is equipped with a building energy management system (BЕMS), thus allowing the full implementation and evaluation of the proposed innovative management scheme.



In this pilot site, a 20 kWh ESS will be additionally installed to the existing 20 kWp PV installation. The pilot site is located at the dormitories building of the Western Macedonia University οf Applied Sciences. 



Six ESSs with nominal capacity of 7 kWh will be installed in five different prosumers with existing PV installations. Additionally, a 20 kWh ESS will be added to the existing PV installation in the municipality building of Nicosia. 



Five prosumers will be selected for installing an ESS with a nominal capacity of 7 kWh to validate the performance of the proposed innovative management scheme.



7 kWh ESS will be established on the main building of the University of Skopje.

Second Group of Pilots


The second group of pilots includes the installation of Smart meters in prosumers and consumers installations.

Measurement data will be acquired continuously for a period of at least one year and an exhaustive statistical analysis will be performed to derive typical consumption and generation profiles for the Balkan-Med region.


The first international conference of the BalkanMed Programme

Date: 2017-11-29 18:11:28

The first international conference of the BalkanMed Programme project Enhancing Storage Integration in Buildings with Photovoltaics - PV ESTIA took place at the University of Cyprus. It served as a discussion platform about tackling barriers in integration of energy storage systems in buildings with PVs and their interaction with the grid. Assoc. Prof. Georgios Christoforidis provided information about the PV ESTIA project and how do we aim to change the way buildings with photovoltaics interact with the grid, thus paving the way towards nZEBs. Prof. Grigoris Papagiannis from the Aristotle University of Thessaloniki (AUTH) opened up the discussion how to tackle and avoid technical barriers of storage, do we need incentives for energy storage and should we focus on decentralized or centralized energy storage?




PV-ESTIA on Facebook

Date: 2018-03-01 18:31:33


Date: 2018-03-02 16:52:19


PV ESTIA second consortium meeting

Date: 2018-03-22 11:29:54

The second Enhancing Storage Integration in Buildings with Photovoltaics - PV ESTIA consortium meeting took place in Limassol, Cyprus between 21-22nd, February, hosted by the Research Centre for Sustainable Energy (FOSS), as part of the University of Cyprus. All project partners participated in a collaborative project meeting, where different technical and non-technical discussions about project progress and further implementation were deeply discussed. Discussions about PV + storage pilots, PV metering, data acquisition and solutions on how to transform buildings into a controllable energy source took place. The project Steering Committee took the decision that EVN Macedonia will join the project consortium as an observer partner. It was also decided that the next project meeting will take place in Plovdiv, Bulgaria.


PV ESTIA meets the Greek Ministry of Environment and Energy

Date: 2018-05-15 15:50:44

The BalkanMEd PV ESTIA project was presented during the stakeholders` meeting with the Greek Ministry of Environment and Energy on April 24, 2018 in Athens. The discussions covered the topics on PVs coupled with energy storage systems as a key step in order buildings to become more grid-friendly and also to meet the decarbonisation and climate mitigation goals set out in the Paris Agreement.

BalkanMed Communication Seminar

Date: 2018-07-02 10:06:45

On 22.06.2018, PV ESTIA Project attended a Communication Seminar for the beneficiaries of the Projects funded under the 1st Call for Project Proposals organised by the Joint Secretariat of the BalkanMed transnational Cooperation Programme. The event enabled the projects’ communication managers to improve their communication skills and to learn more about implementing the dissemination strategy of the EU co-funded projects. It also provided valuable insights into BalkanMed Communication & Dissemination Rules.

TRCWM presents a scientific paper during the 5th IEEE International Energy Conference in Limassol

Date: 2018-07-04 15:28:50

A presentation of a scientific paper related to PV-Estia project was implemented by the Technolocigal Research Center of Western Macedonia in June, 2018 during the 5th IEEE International Energy Conference in Limassol, Cyprus. The paper will be available in large international databases (IEEE Xplore, Scopus, etc) in the following months, ensuring that interested scientists and stakeholders will become aware of the work done in the PV-ESTIA project. It examines voltage quality problems in Low Voltage (LV) Distribution Networks (DNs) due to high Photovoltaic (PV) and Electric Vehicles (EVs) penetration. The proposed methodology considers Battery Energy Storage Systems (BESSs) along with the PV units in order to store the energy surplus that causes overvoltage during the high PV generation. This stored energy is utilized at night when the majority of the EVs is expected to be charged. Moreover, a Unified Particle Swarm Optimization (UPSO) algorithm is used in order to optimally schedule EVs charging during the night and under different charging modes. This scheduling is implemented under either an assumed continuous charging mode or an intermittent one. The objective function is set to be the optimal voltage profile. A real LV DN with real measured load data is examined. Variations have been taken into account about some EVs’ parameters and the results indicate that the voltage profile is significantly improved under the proposed charging schedule by the UPSO. If this charging schedule is combined with efficient exploitation of the BESS stored energy then the improvement is even higher. The proposed approach also improves energy efficiency towards the implementation of the Nearly Zero Energy Buildings (NZEB) concept.

PV ESTIA presented in Plovdiv

Date: 2018-07-04 16:12:18

The EU has set itself a long-term goal of reducing greenhouse gas emissions by 80-95%, when compared to 1990 levels, by 2050. A presentation about Nearly Zero Energy buildings, current national nZEB legislation and requirements, PV ESTIA project and how to transform buildings into controllable energy and on the next generation of EU building directions as part of the 2050 Energy Strategy  was implemented in Plovdiv in May, 2018.


PV ESTIA workshop in Skopje

Date: 2018-07-04 16:16:07

The Ss. Cyril and Methodius University in Skopje organised a workshop on the policy barriers and opportunities related to nZEBs and PV+storage was held on April 11 2018 in Skopke involving all relevant national stakeholders. In light of the new national Energy Law a fruitful debate took place concerning the integration of rooftop PVs and the opportunities for Energy Storage Systems. 


The first university rooftop PV system in Macedonia is completed

Date: 2018-09-04 13:57:20

Ss. Cyril and Methodius University of Skopje’s Faculty of Electrical Engineering and Information Technologies (FEIT) completed the first university rooftop PV system for self consumption in Macedonia. The PV system has a total capacity ot 22 kWp, whether 12 kWP are coupled with an energy storage system and were implemented with the financial support of the INTERREG project Enhancing Storage Integration in Buildings with Photovoltaics – PV ESTIA. The total investment worths 27.500 EUR and is expecteto cut electricity bills by 3000-3500 EUR/y.


A workshop "Electricity storage, Electrifcaton and Renewable Energy Sources"

Date: 2018-10-23 16:11:04

TRCWM took part in the Workshop organized by the Technical Chamber of Greece in Thessaloniki on 05/06/2018 entitled “Electricity storage, Electrifcaton and Renewable Energy Sources carve the future of growth-driven by environment improvement”. Assoc. Professor Georgios C. Christoforidis presented the PV-ESTIA project in an audience that involved stakeholders from local and regional governments, engineers, academics, private companies and others.

TRCWM participated in EU HEROES H2020 project’s Thematic Workshop

Date: 2018-10-23 16:13:18

TRCWM participated in EU HEROES H2020 project’s Thematic Workshop hosted by the Centre for Renewable Energy Sources (CRES), in Athens on 20/09/2018. Assoc. Prof. Georgios C. Christoforidis made a presentation entitled “Overview of the PV-ESTIA project”. A roundtable discussing business models for storage in energy communities took place. Also, a questionnaire related to business models was distributed to the audience and TRCWM responded promptly.

The 3rd project meeting took place in Plovdiv

Date: 2018-10-23 16:25:02

The 3rd BalkanMed Programme Enhancing Storage Integration in Buildings with Photovoltaics - PV ESTIA project meeting took place in Plovdiv, Bulgaria on 10th and 11th, October, 2018. It aimed to discuss the project` progress in each country, as well as all pilot activities. Discussions on current policy barriers, data collection tools and a possible design of an innovative management scheme suitable for buildings equipped with PVs and energy storage systems took place. The project partners also discussed possibiliteis for designing of roadmaps enhancing PV+storage integration in buildings, so as to reach an increased renewable self consumption and thus to increase the number of nZEBs.


The Energy Agency of Plovdiv presented PV ESTIA during the annual ABEA meeting

Date: 2018-10-23 17:33:03

The Energy Agency of Plovdiv presented PV ESTIA during the annual meeting of the Association of Bulgarian Energy Agencies (ABEA) in July, 2017. The main objective of the workshop was to:

  • To provide comprehensive information about the PV ESTIA project and its main outputs
  • To involve key regional energy experts in the energy storage behind the meter topic
  • To discuss barriers in front of PVs and energy storage behind the meter 
  • To discuss current energy and RES trends in Bulgaria.


AUTH pilot installation

Date: 2018-12-17 11:23:35

The Aristotle University of Thessaloniki - Department of Electrical & Computer Engineering intends to install a pilot installation within the research committee building of the university. Currently the pilot installationg is under the tender stage for the commissioning and installation of the equipment. It is planned to be concluded by February 2019. The pilot will consist of:

  • 15 kWp  PV  panels + 15 kW  inverters + 18 kWh batteries;
  • Metering and control equipment for monitoring both electrical and thermal energy;
  • Communication, data acquisition and display features.


During the pilot operation the overall building eneformance, both thermal and electrical, will be monitored under different operational scenarios. More specifically the following building features will be monitored: thermal loads (heating & cooling), ventilation, outdoor and indoor temperatures, PV generation, electrical loads, energy storage.


PV-ESTIA presented in Sofia

Date: 2019-01-22 12:34:56

A presentation entitled: "Energy storage systems - a promising solution for achieving nZEB building” including other PV-ESTIA project information, its goals and methodology was presented by Mr. Petar Kisyov during the 13th National ABEA conference “Intelligent Cities and Regions –  integrated energy management, bio-economy, nearly zero energy buildings”. The presentation included information about the new energy horizons and the EU long-time energy strategy, relevant information about PV ESTIA pilots and some data already obtained from the storage solutions implemented. 



PV-ESTIA participated in the ETAI 2018 Conference

Date: 2019-02-04 11:21:52

On 21th September 2018 representatives of UKIM-FEIT took part in the ETAI 2018 Conference and presented the paper titled “On the Effectiveness of Three Battery Control Strategy Formulations for Residential Photovoltaic systems” ( ). Representatives from academia and industry got informed about the PV-ESTIA project and on frequently used battery control strategies and the implications they have on the household’s net consumption. The conference session was attended by participants from different fields, which lead to an interesting debate on the current legislation regarding PVs installation in households. It was concluded that further country specific research would be useful to see whether or not battery storage is cost-effective. As the audience was comprised of engineers and experts in different fields it initiated a debate on the current battery market to be acquainted with the issues being discussed.


PV-ESTIA at the International Conference Energetics 2018

Date: 2019-02-04 11:30:51

On 5th October 2018 representatives of UKIM-FEIT took part in the International Conference Energetics 2018 titled “The PV-ESTIA Project: Possibilities and Perspectives for Increasing the Integration of Energy Storage Systems”. The paper “The PV-ESTIA Project: Possibilities and Perspectives for Increasing the Integration of Energy Storage Systems” was presented at the conference. As there are only a limited number of practical PV+storage cases, mostly used in isolated system, it was concluded that the PV+storage system installed at the Faculty of Electrical Engineering and Information Technologies provided numerous benefits. For instance, it gives researchers access to the storage system consisted of LTO batteries. With large focus being given to lithium technologies such as LiPO4, the energy storage system in FYROM could be used to widen the practical knowledge related to LTO batteries.

Beside informing representatives from academia and industry, the objective of this conference was to also inform policy makers about the need for updating the legislation for PV integration in buildings and developing a national definition for nZEBs in general.

FOSS during the 6th International Conference on Renewable Energy Sources & Energy Efficiency

Date: 2019-02-04 11:33:29

The UCY project team participated with a poster in the 6th International Conference on Renewable Energy Sources & Energy Efficiency. The poster presented the PV-ESTIA project in general and introduced the selected equipment for the case of Cyprus. It also demonstrated the designed solution based on which the equipment was selected. More than 100 people attended the 2-day Conference held at the facilities of the University of Cyprus, mainly coming from the scientific community.

Email Newsletter


Aristotle University of Thessaloniki - Department of Electrical & Computer Engineering

Technological Research Centre of Western Macedonia

University of Cyprus - Foss Research Centre For Sustainable Energy

Electricity Authority of Cyprus (DSO)

Energy Agency of Plovdiv

Ss Cyril and Methodius University in Skopje

Ministry of Environment and Energy - Directorate for Renewables and Electricity

Contact information

Energy Agency of Plovdiv
Ruski 139 blvd, Plovdiv, Bulgaria


Login Work packages Gallery


Promoting innovative technologies to improve environmental
protection and resource efficiency in the waste sector,
soil protection or to reduce air pollution.
1 August 2017 - 31 July 2019

The transnational Cooperation Programme
Interreg V-B "Balkan-Mediaterranean 2014-2020"
is co-funded by the European Union (85%)
and National Funds of the participating countries (15%)

©Copyright 2017-2022