Two children run hand in hand across a sunny lawn in a park. Both are wearing long white robes and light headgear; the scene is shot from behind, so that the movement and running together are in the foreground. Large trees provide shade around them, and palm trees can be seen on the right. In the background, modern high-rise buildings and a bright, clear sky are visible, indicating an urban environment near a green space. The image conveys lightness, togetherness and a carefree moment outdoors.

Be eco-friendly.

Green solutions to make your property sustainable.

Reduce your property's carbon footprint, build a sustainable future, and enhance your property's image. Our SmartTech solutions offer innovative ways to manage your environmental impact effectively.

Your benefits at a glance:

Reduce CO₂ emissions

Achieve sustainability through energy savings

Enhance property value

Future-proof properties with our smart devices

Nationwide coverage wherever you are

Choose ista for the best-in-class eco-friendly solutions and sustainable property management.

By reducing your carbon footprint and implementing sustainable practices, you can save money on utility bills while creating a healthier and more comfortable living environment.

Our services are designed to make green living simple and achievable, with easy-to-implement solutions that create a big impact.

We are an Energy Service Company (ESCO)

An ESCO is a specialized organization that delivers end-to-end energy solutions. Our services include energy audits, design, implementation of energy conservation measures (ECMs), financing, as well as the operation and maintenance of energy systems.

Our core mission is to improve energy efficiency and reduce energy costs — often with little to no upfront investment required from the client.

We operate under performance-based contracts, meaning our compensation is directly linked to the energy savings achieved. This model aligns our success with our clients’ cost reductions and ensures accountability.

Popular services

A meeting is taking place in a modern, light-filled office with glass walls. In the foreground, one person is sitting at a table in front of an open laptop, with printouts and a pen next to them; another person is standing next to the table and appears to be moderating the discussion. A third person is sitting opposite, gesturing as if explaining a point. In the background, other people are working in a lounge area, separated by glass and furniture. The ceiling lighting and visible technical installations emphasise the contemporary character of the workspace and a collaborative, professional working atmosphere.

ESCO Solution & Services

Achieve greater energy savings and efficiency with our comprehensive energy management and ESCO services, focusing on performance enhancements with no upfront costs through guaranteed savings.

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A technician is working in a narrow technical room or basement corridor under a ceiling with several parallel metal pipes. He is wearing a blue safety helmet and a work jacket and is raising both arms to check or adjust a pipe or bracket above him. On the right, further installations such as ventilation ducts and cable ducts can be seen, while the walls are made of concrete or brickwork. The perspective looks along the pipes into the depths of the room and emphasises the technical infrastructure of the building.

Retrofit Solution

Transform your existing systems with our retrofit solutions, designed to improve efficiency, sustainability, and performance without the need for full system replacements.

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Control and manage

A service technician wearing an orange safety vest and protective helmet stands in an industrial plant between pipes and machine components. He is holding a tablet in his hand and checking a plant unit at head height, as if he were checking measurements or documenting a maintenance step. In the background, cables, metal beams and other technical installations run along a narrow corridor, and the lighting is reminiscent of a production or technical area. The scene conveys inspection, maintenance and digital documentation of plant operation on site.

Energy Audits

Accredited to perform ASHRAE Level 1, 2, and 3 energy audits by the designated authority.

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The picture shows a light-flooded part of an office space. Two men can be seen sitting at a desk directly in the foreground, stretching from left to right in the lower third of the picture. The man sitting on the left has short, dark brown and curly hair, a brown-red beard, wears round glasses with black frames and a black shirt. The man to his right has almost black short hair, a brownish beard and is wearing a black T-shirt. Both men are looking at the two monitors on the desk in front of them. Both men are looking at the carbon audit provided by ista on these monitors. To the left of the monitors on the desk is a black printer. To the right of the monitors is a telephone and next to it, on the right-hand edge, two letter trays are stacked. In the background you can see a wall consisting of large windows that stretches from the first left third of the picture to the right edge. In addition, the ceiling, which can be seen in the upper part of the picture, also consists of the same large windows. On the right-hand side of the picture, a dark brown, approximately waist-high room divider can be seen, which bends to the right once. Six plants can be seen on the room divider and behind it. To the left of the picture, directly next to the man on the left, is a wall consisting entirely of green plants.

Carbon Audit & Reporting

Assess and reduce your carbon footprint with our carbon audit and reporting services, helping you meet sustainability goals while staying compliant with environmental regulations.

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Property improvement

In a modern open-plan office, an employee sits at a desk and works intently on several large monitors. In front of him are a keyboard, mouse, coffee cup and glass of water; the depth of the image is emphasised by additional monitors in the foreground. In the background, a second person can be seen at a workstation, while daylight streams into the room through tall windows. A graphic with gears hangs on the wall, reminiscent of technology, processes or digital collaboration. The scene conveys focused work, a team environment and a professional IT/office atmosphere.

SmartValve Service

Improve system efficiency and control with our smart valve services, using real-time data and automation to optimize flow, reduce energy consumption, and enhance performance.

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A hospital corridor with bright ceiling lights and several doors along the walls. Several medical professionals are walking around: some are wearing lab coats, others blue surgical scrubs. In the centre of the image, two people are walking side by side and talking to each other while holding documents in their hands. In the foreground, a nurse is walking down the corridor with a yellow document, while other staff members are moving towards the ward. An exit or orientation sign can be seen at the end of the corridor. The scene conveys a typical day in a hospital with team communication, documentation and movement between treatment areas.

Indoor Air Quality Measurement

Ensure a healthy indoor environment with our advanced air quality measurement solutions, designed to monitor, assess, and optimize air conditions for better health and comfort.

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In a modern open-plan office, a person dressed in traditional white clothing with a head covering sits at a desk holding several printouts. They point to a spot in the document with a pen, as if explaining and highlighting numbers or content. There are more papers on the table; in the background, workstations, monitors and a second seated person can be seen. Concrete ceilings, bright lighting and an open-plan layout convey a professional meeting or examination situation in which documents are reviewed together and decisions are prepared.

Compliance Reporting and Billing

Simplify energy regulations with tailored solutions for accurate energy metering and billing.

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Partner with us for a sustainable future — let's discuss your property needs today.

Facts & Figures

6,300 employees

20 countries

3.7 mil. t CO₂ emissions avoided

14 mil. utilisation units

Innovative solutions which deliver results.

Our digital solutions are designed to help our clients reduce their environmental impact, improve health and safety in their buildings, and reduce energy costs.