Varna District achieving nZEB goals

70% of heating and domestic hot water heating  "Kaisieva Garden" District in Varna can be covered by solar energy through the application of solar thermal technology. For residents of Varna, this means an enormous opportunity to provide clean, non-polluting heat as well as independence from rising fuel prices. The data is the result of a survey we conducted in cooperation with our partners in SDH2PM. More info here


SDH is a Chance to Save Bulgarian Cities from the Air Pollution 

Instead of burning RDF in the very center of Sofia to generate heat energy, the Sofia Municipality can build a modern and environmentally-friendly District Heating network in all neighborhoods and districts that currently lack DH systems and where households use coal/wood burners for heating their homes. The projected municipal long-term debt of €67 million that Sofia Municipality intends to take to build a “cogeneration plant in Sofia with RDF waste utilization” can actually be invested in Solar District Heating. This kind of energy source provides household heating through the energy of the Sun. Therefore, SDH are completely ecological they do not emit neither carbon emissions nor particulate matter in the air.


The proposal was addressed to the Sofia Municipality by the Institute for Zero Energy Buildings (IZEB) and Austrin engineering company S.O.L.I.D


Possible plots for pilot SDH plants in Sofia DH facility


The modern SDH solutions are ecological and sustainable and can save all the Bulgarian cities from the air pollution due to domestic heating. SDH systems are able to eliminate harmful gases and particulate matter that are typical air pollutant when burning of low-grade coal, damp wood, and non-combustible raw materials such as automobile tires, clothing, etc.


The current DH technologies are based on natural sources of energy: sun, earth, biomass. They are an effective solution to tackle air pollution from domestic heating - on a big scale and in the long term. Also a DH system nas a strong social impact - stable energy prices, security of the energy supplies and energy independence at local and regional level.

Big Solar Gratz schematic. Source https://solid.at

It is imperative to introduce the topic into the agenda of the Bulgarian municipalities and all the responsible institutions, given the fact that the European Comission already started an infringement procedure in the EU Court against Bulgaria - due to the unfulfilled obligations regarding the quality of the atmospheric air.


IZEB wins 1-st prize at 4th International Solar District Heating Conference


Arch Milan Rashevski took the prize
The successful integration of SDH in the urban areas is facing the problem of the land use and related costs and general lack of free space. Land areas are needed for both – collector fields and storage. PTES has proven to be one of the most feasable storage sollutions, however, not including investment for land use, which can be significant in urbanised areas. Furthermore, pit storages include sophisticated and expensive cover lid with low static bearing capabilities. The area of this cover lid is significant compared to other storage types and implies high land costs. In addition, long distances from the solar field to the DH network are causing additional losses and infracstructure investments. In this sense, it is very logical to look for technical opportunities to use this area for solar collector field.

IZEB wins 1-st prize at the 4th International Solar District Heating Conference with the proposed Floating thermal collectors on top of seasonal water pit storages. More info here

EEA project

IZEB completed promotional project for introducing SDH technology in Bulgaria under EAA grants. 

First in Bulgaria SDH conference was held in Sopharma Towers, Sofia with presentation from Mr. Leo Holm from ARCON-SUNMARK. 


More info: http://www.sdh.bg/


IZEB consultancy for energy autonomus residential complex

Сглобяеми къщи от професионалистиIZEB was resently comissioned by private developer Sweet Home to perform a feasibility study for development of and energy autonomus residential complex near Sofia. The team from the Institute will create technological solution for achieving energy independancy of single family households. Expect more info coming soon!


IZEB is promoting solar district heating in Bulgaria

Institute of Zero Energy Buildings started reasearch and promoting  program  of  solar district heating. New generation district heating systems on Balkans is a crutial solution for large scale sustainable heating in the near future. It is interconnected with the energy systems of Zero energy buildings and building renovation processes. Supported from  State of Green  we visited the most amasing solar based heating plants in Europe. IZEB is initating several SDH pilot projecs proposals in Bulgaria and Macedonia. More info soon.


IZEB signed memorandum of collaboration with EVIC

IZEB signed a memorandum of collaboration with Electric Vehicles Industrial Cluster.

EVIC is the unique professional organization in Bulgaria, operating in the field of electric mobility.
The cluster participates in expert level in directions like - strategic developments, technological developments, changes in regulations, higher and vocational education and training, connection  with the central and local governments, etc.
EVIC initiated the creation of the ''National Programme for electric mobility - Bulgaria 2025''

Zero Energy Buildings and Electric Vehicles are in synergy: on level of electricity exchange, building design and even urban design. Long therm envisages for the future living areas must develop future buildings and mobility together.

IZEB and EVIC are going to promote and research synergetic development of buildings and electric mobility in the next decades.


IZEB in Qatar

Institute for Zero Energy Buildings took part in the business delegation of the president Plevneliev in Qatar.


ZEB1 - Pilot project for energy autonomy building

Goal: 100% energy independancy

System: PVT facades + seasonal heat storage + low temperature engine

Status: technical design

More info: soon!


European Nearly Zero Energy Buildings Conference