Technologies & Solutions

Why choose Resalta?

Technological Neutrality

We are not dependent on any single equipment or technology provider, so that we can always make sure to offer our clients the very best available technology suited to their particular needs.


Innovations are crucial to the work Resalta does. Our solutions are adapted to each individual project, always with the goal of providing the strongest possible impact on our client’s energy savings.

Turnkey solutions

We take care of everything from A to Z. You can relax knowing that Resalta will carry out your energy renovation project without any drain on your resources, be it manpower, time or money.

Energy efficiency
Energy Efficiency
Renewable energy sources
Renewable energy sources
Large heat and power projects
Large heat and power projects

Energy efficiency

There are very many ways in which we can help our different clients achieve better energy efficiency. These depend on their energy needs and consumption, their priorities, their core business. Here is a non-exhaustive list of some basic steps that can be taken in many cases. 

Energy consulting

We carry out energy audits identify potential and serve as a basis for making qualified decisions on the next steps that can be taken to improve energy efficiency. For each measure we indicate the energy/cost savings, the investment amount required, payback period, priority level of each measure and the possibility of acquiring available grants.

Energy management

The introduction of energy management systems allows clients to control and manage energy consumption. This is a measure that gives us a transparent and simple overview of all energy and financial flows in real time. The automated collection and processing of data improves the reliability and quality of energy management systems, which consequently results in more efficient energy consumption.

Thermal and electrical savings measures

In many cases, we can achieve up to 50% or more electrical energy savings and reduce maintenance expenses simply by replacing obsolete technological equipment. Besides the replacement of boilers, chillers and other equipment with more energy efficient technology, the following solutions help further reduce costs:

  • Improved metering and billings systems
  • Compensation of reactive power
  • Introduction of surveillance and regulation of peak electrical power
  • Energy-efficient lighting
  • Accumulation of cooling energy
  • Exploitation of waste heat
  • Thermal insulation of buildings
  • Replacing windows and doors with more energy efficient ones
  • Automatic regulation of temperature in premises, according to specific needs


Plantaže – Montenegro, Resalta

Plantaže – Montenegro

Plantaže AD, the largest winery in the region and one of the most famous, had very high energy costs. 

Gorenje/Cooling – Slovenia

Gorenje/Cooling – Slovenia

Its original two systems had an insufficient cooling capacity, were obsolete and had a low energy efficiency ratio, in addition to which they operated all year long and did not take advantage of the site’s free-cooling potential. 

city of Ljubljana, Resalta

City of Ljubljana – Slovenia

Situation before the contract and client requirements The public tender for the energy retrofit of the City of Ljubljana included 49 buildings, among which were elementary schools, kindergartens, libraries, cultural institutions, healthcare centers, sports centers and administrative bui

Renewable energy sources

Renewable energy sources are at the heart of what we do, and a major component of most of our solutions. Here is an overview of some of the renewables most often used in Resalta’s projects.


Biomass is a renewable and CO2-neutral source of energy, which enables energy self-sufficiency. Taking into account the cost of energy, the transition to biomass can create significant savings compared to other forms of heating and is especially useful for businesses that have a year-long need for heating. 

Biomass boilers are particularly well suited for industrial facilities, retirement homes, schools, kindergartens, hotels and sports facilities. By installing such biomass-powered systems we can easily ensure financial savings and reduce environmental impact.


Solar panels exploit the sun’s radiation and turn it into useful heat. This heat is stored in heat storage tanks and is available for heating buildings or sanitary. Besides bringing financial benefits, solar panels can significantly reduce carbon footprints, although they are best suited for regions with continuous sunny weather.

Heat pumps utilizing surrounding energy

The installation of heat pumps to heat buildings and sanitary hot water enables savings where various solutions are available, depending on the medium in question. Heat pumps can significantly reduce the cost of heating buildings and represent a renewable energy source. If reversible heat pumps are used, then cooling can also take place. For simultaneous heating and cooling, we use polyvalent heat pumps with high efficiency rates.

Cogeneration of heat and power

Specialized equipment exists that can use fuel such as biomass to generate both thermal and electric energy at once, making it a highly efficient solution for many types of clients. These CHP units can range from small ones that can provide energy to nursing homes, to whole plants that can power entire communities.   


Dobropolje Elementary School, Resalta

Dobropolje Elementary School – Slovenia

The municipality was using two expensive and inefficient crude oil boilers to heat the elementary school and one kindergarten (2 x 230 kW). The schools use 300 MWh annually.

Schools in the City of Pirot, resalta

Schools in the City of Pirot – Serbia

The City of Pirot announced a public tender in order to lower heating costs in four schools and improve efficiency.

Eltid Tannery, Resalta

Eltid Tannery – Serbia

The client was using biomass as an energy source but for a much smaller energy output. Due to a big increase in production the client’s energy requirements went up. 

Large scale heat and power projects

Besides energy efficiency projects, Resalta also develops and carries out large-scale sustainable energy generation projects, generally exceeding 5MW in capacity. 


Methane from biogas, a natural byproduct of sewage treatment, landfill and animal-waste facilities, is a ready source of renewable energy.

Rather than burning this gas, which consumes energy and increases local emissions, Resalta can help commercial and public facilities use this biogas as a form of renewable energy. 






Landfill gas

We design, build, maintain and operate renewable energy plants for facilities near landfills. These renewable energy projects safely divert landfill gas through extraction wells and pipe it to a landfill-gas-to-energy plant, where it is cleaned before specialized engines convert it to energy for use by the facility and, in many cases, the nearby community.

Cogeneration of heat and power

Resalta helps customers and communities harness the potential of biomass energy by building power and cogeneration facilities that cleanly burn renewable waste to fuel specialized engines that generate power and heat.

Large-scale heat pumps

The thermal power of rivers as well as wells and other underground bodies of water can be to produce heat for consumers in cities, district heating and private clients.


Slatina, Resalta

Slatina CHP – Croatia

The Slatina project was launched to build a cogeneration heat and power plant that runs on biomass. It will be located in the northern part of Croatia in the Slatina municipality. 


Sustainability and energy efficiency are widely recognized as principles that companies and public institutions include in their long-term strategies and goals. However, besides often lacking the know-how to implement and realize energy efficiency projects, many of our clients also lack the required funds to dedicate to this particular goal. This is why we have two financing models, one for the private sector and one for the public sector, which we apply in each and every single one of our projects, making sure our clients never spend a dime out of their own pocket. 

The ESCO model

The term ESCO stands for energy service company. The model allows companies like Resalta to carry out energy services without the clients having to invest their own capital into the projects.


Using the ESCO model, we carry out the energy audit of your facilities, propose a solution, implement, operate and maintain it, but most importantly we provide the financing so that you can keep focused on your core business.


We guarantee results, and clients repay us from the achieved savings.


Learn more about the ESCO model >>

Public-private partnerships

Public-private partnerships (PPP) are in essence the ESCO model applied to public institutions. The public partner publishes a tender seeking a private partner for an energy renovation, be it for lighting, biomass, cooling, or any other energy need. The private partner proposes a solution, and if the tender is granted, takes on the entire project from beginning to end. This means providing all the financing, construction work and implementation, and maintenance for the duration of the contract signed.


All risks are taken on by the private partner which guarantees savings to the public partner. The investment is repaid to the private partner from the savings achieved.


Learn more about PPP >>


City of Kruševac, resalta

City of Kruševac – Serbia

Kruševac is a city in southern Serbia, as well as the seat of a wider administrative area with 128,000 inhabitants. Its public lighting infrastructure is outdated and the city has published a tender for a public private partnership to renovate the systems.

Mercator Sebia, Resalta

Mercator – Serbia

Mercator’s retail centers throughout Serbia are relatively inefficient, dependent on district heating and have obsolete lighting systems.

Livar, Resalta

Livar, Črnomelj – Slovenia

Following the realization of Resalta’s energy efficiency project in Livar’s Ivančna Gorica facilities, an energy audit showed that the Črnomelj site had an even bigger potential for savings.

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