Interactive energy classification map

Icons use case study city info



Icons use case study main actors

Main actors

City Government, Public Utility, other

Icons use case study project area

Project area

Whole City/Administrative Region

Icons use case study duration


Ongoing since 2013/08

An innovative interactive energy map lets Vilnius citizens access and compare energy performance data for every apartment block in the city, online.

Residents of Vilnius’ 2,800 city-owned apartment blocks can now access an online map to evaluate and compare the heat consumption of their buildings. This interactive map uses a classification system, ‘actual energy consumption class’, to sort buildings into six categories according to their heat consumption, ranging from good to especially bad. Vilnius is currently in the process of renovating the blocks, with a goal of 600 by 2020. This would make a big difference to the city’s heat consumption, but in the meantime it hopes to raise awareness among residents of ways to improve energy efficiency. By visiting the map online or on their smartphones, residents can find out how their building ranks, compare its consumption over several years and compare it with other buildings in the city. The city then offers tips on how to improve efficiency, such as insulation, window and door replacement and heating system modernisation. 

Originally published by EUROCITIES, the network of 130 European cities  PDF:

Sustainable Development Goals

Ensure access to affordable, reliable, sustainable and modern energy for all
Build resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation
Make cities and human settlements inclusive, safe, resilient and sustainable
Take urgent action to combat climate change and its impacts


This project was awarded the 'EUROCITIES Awards' in 2014 in the following category: Innovation.

Vilnius, Lithuania

Size and population development
The most recent estimates recorded by the Municipality in 2015 show the official population of Vilnius is 542,664 with a population of 1,392 people per km2. Vilnius’ population has risen and fallen multiple times, destruction and fatalities during wars have led to sharp declines, while an influx of refugees and student migration have led to increases. In the early 2000s, Vilnius experienced slight declines in its population, however, since 2013, the city has seen population increases of around 1%, indicating that the city may continue to see slow growth in the coming decade.

Population composition
At the time of the 2011 census, there were 128 different ethnicities recorded. This makes it the most diverse city in the country. The census found that 63.6% of the population is Lithuanian, 16.5% are Polish, 12% are Russian, and 8.6% were categorized as “other.” 49% of people who completed the census identified at Roman Catholic, 8.93% as Eastern Orthodox, 23.66% as no response/none/other and less than 1% each for Old Believers, Evangelical Lutheran, Evangelical Reformed, Sunni Muslim, Jewish, Greek Catholic and Karaites.

Main functions
Vilnius is the capital and largest city of Lithuania and the second largest city of the Baltic States. It is situated in south-eastern Lithuania at the confluence of the Vilnia and Neris Rivers and lies 312 km from the Baltic Sea and Klaipeda, the chief Lithuanian seaport. Vilnius covers an area of 402 square kilometres. Buildings occupy 29.1% of the city; green spaces occupy 68.8%; and waters occupy 2.1%. The city is known for the architecture in its Old Town, declared a UNESCO World Heritage Site in 1994.

Main industries / business
Vilnius is an important industrial centre, producing machine tools, agricultural machinery, electronic calculators and other electrical and electronic apparatus, textiles, clothing, and foodstuffs. More recently the city has become known for its growing renewable energies and biotechnologies sectors.

Sources for city budget
The City of Vilnius draws its budget for public expenditure largely from taxes, fees, fines and operating revenues.

Political structure
Vilnius is the seat of the main government institutions of Lithuania and the Vilnius District Municipality. The city is governed Vilnius City Municipality which was established in 1995. A 51-member council is elected to four-year terms; the candidates are nominated by registered political parties. As of the 2011 elections, independent candidates also were permitted. Commencing in 2015, mayors are now elected by the residents, prior to this, they were elected by the council. ________________________________________

Administrative structure
Vilnius City Municipality is one of 60 municipalities of Lithuania and includes the nearby town of Grigiškės, three villages, and some rural areas.

Over two thirds of Vilnius’s 600,000 citizens live in privately owned apartments, in large multi-storey blocks built between 1960 and 1990. They were constructed with poor thermal insulation and old style centralised heating systems. Heat is delivered to every apartment, from October to April, with no apartment level metering or controls. It has been shown that the energy efficiency of these buildings could be improved by up to 50% with major renovation. Reducing energy consumption and CO2 emissions is a major priority for Vilnius. Initial surveys of the city’s 4,799 apartment blocks identified 2,800 blocks that would deliver significant energy efficiency improvements through modernisation.

By 2012, the homeowner associations of 96 of these blocks had undertaken major energy saving renovations, including roof insulation, window and door replacement, and heating and ventilation system modernisation. But it was clear that other multi-apartment homeowner associations needed encouragement to do the same.

Working closely with Vilnius Municipal Government and energy company UAB Vilniaus Energija, Dr Romanas Savickas of Vilnius Gediminas Technical University took up the challenge. He devised an innovative interactive energy classification map, displaying actual energy efficiency for every residential block in Vilnius. The project required the development of reliable and meaningful energy efficiency indicators and making these accessible to all citizens.

The solution uses actual monthly energy consumption data during the heating season, for all 4,799 apartment buildings in Vilnius. An advanced methodology is then used to adjust this data for factors such as external temperatures, heating temperatures and heating duration. The outcome is an energy efficiency measurement for each building.

To make comparisons easier, the energy efficiency measurements are grouped into 15 classes: class one for very high energy efficiency down to class 15 for very low energy efficiency. These 15 classes are further grouped to create six energy efficiency ratings, colour coded for display on the map: very good and good (both in green), average (yellow), poor (orange), very poor (red), and extremely poor (purple).

This energy efficiency information for all 4,799 apartment buildings is displayed on the interactive energy efficiency map. By going online, on a computer or smartphone, citizens can now freely access energy performance data for every residential block in the city. They can select a particular building, and then view a pop up window showing energy-related information. This includes: the building’s energy efficiency class for each winter since 2011-2012; building type and construction year; monthly energy efficiency graphs to date.

Information is updated each month during the heating season; and new multi-apartment buildings can be added.

Total costs for this project amount €50,000, funded by the heat supply company.

At the launch in 2013, energy efficiency for the 96 recently renovated blocks was confirmed as very good; 256 blocks were rated good; 1,104 average; 2,715 poor; 512 very poor; and 119 extremely poor.

By January 2015, the Vilnius energy map had been accessed and viewed more than 200,000 times; and the number of homeowner associations joining Lithuania’s national renovation and modernisation programme for multi-apartment buildings had grown to more than 400.

With increasing public awareness of energy efficiency, Vilnius Municipal Government is confident that further homeowner associations will vote in favour of modernising their multi-apartment blocks. The aim is for an additional 240 blocks to be renovated by 2016, with a total of 600 blocks renovated by 2020, which could cut CO2 emissions by 1,800 tonnes a year.

Raising public awareness of the map has been a vital aspect, and was included in the €50,000 project funding from UAB Vilniaus Energija. In 2014, the map was promoted at two major exhibitions. Members of the public were able to access the map, view an accompanying energy conservation video, and receive advice on energy saving measures.

Cities in action - Interactive energy classification map, Mapping energy efficiency in homes - EUROCITIES, April 2015.

On the Map

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Want to know more about this project?

Brussels Capital Region, Belgium


Institution | Urban Award

Eglė Randytė
Vilnius, Lithuania

Eglė Randytė

Individual | Project Manager

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