Customer Portals

Customer Portals

Exterior view of a modern apartment building with several floors and spacious, staggered balconies with glass railings. The façade is designed with light, clear lines, and large windows reflect the surroundings. Warm sunlight falls into the picture from the left, creating a golden evening atmosphere; tree tops and a street or driveway can be seen in the foreground. Other buildings in the city stand out in the background. The image has a calm and high-quality feel, conveying urban living in a contemporary architectural context.

Elevate property management with ista's one-stop automation and optimization services.

Unlock the full potential of your property with our smart, automated solutions.

Our one-stop solutions for all your needs.

From energy management to smart metering automation, ista offers a one-stop solution for all your property needs. Our innovative technology and long-standing expertise ensure that you can trust us to provide the most innovative and effective solutions for your property. With ista, you can enjoy improved comfort, lower energy bills, and a more sustainable living environment. Whether you're a property manager or property owner, we have you covered.

Most popular

Explore our top-rated services – proven solutions that deliver real value every day.

Metering and billing services

Smart metering and billing for precise consumption tracking and effortless cost distribution.

Improve efficiency

Optimize processes and reduce costs to boost overall efficiency.

Property services

Boost efficiency by streamlining operations and cutting energy waste.

Most popular

Discover our most in-demand services — designed to increase efficiency, transparency, and smart resource management.

Close-up of several people at a shared workspace: hands typing on keyboards and operating computer mice on desktop PCs. One person is wearing a yellow knitted jumper and a bracelet; other arms can be seen blurred in the foreground. The scene conveys concentrated work in an office or training room.

Utility Billing

Consolidate all your utility services into one streamlined billing system, simplifying payments and reducing administrative efforts for both property managers and end-users.

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.

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.

Metering and billing services

Our metering and billing services ensure transparent consumption data and fair cost allocation – fully automated, accurate, and compliant with local regulations.

A shot of a modern residential or office high-rise building from below. The light-coloured façade has a clear structure and is characterised by several staggered, widely projecting balconies. Glass railings and large window fronts reflect the daylight and provide insights into the interior. The balcony slabs form strong horizontal lines and create a dynamic, staggered silhouette. A bright sky can be seen in the background, making the contours of the building particularly clear. The image conveys contemporary architecture, urban living and high-quality building design.

Metering Technologies

Advanced technologies for reliable utility tracking and management.

A person sits in a modern office in front of large windows, holding a smartphone in their hand. An open laptop sits on the table. Outside, an illuminated cityscape can be seen at sunset. The scene conveys concentrated work in a quiet, professional environment.

Collection of Chilled Water Charges & Customer Service

Enhance your payment processes and customer satisfaction with efficient cash collection services and dedicated support, ensuring smooth transactions and responsive assistance for end-users and property managers.

A person is working at a desk in an office, pensively holding a pen in their hand while looking at a large monitor. Several windows with text-based content and coloured areas are open on the screen, suggesting analysis or development work. In the foreground, another screen is blurred, next to it are a keyboard and a coffee cup. The environment is warmly lit and looks like a focused workplace in a home office or study. The scene conveys focused work, digital information processing and a calm, professional atmosphere.

Remote Connectivity (MDMS)

Enable seamless, real-time metering data collection and monitoring with our Remote Connectivity (MDMS) solutions, ensuring efficient management and analysis of energy consumption across multiple locations.

Improve efficiency

Enhance operational workflows and minimize energy waste to achieve significant cost savings and improved overall efficiency.

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

Gain valuable insights into your energy usage with our energy audit services, identifying areas of waste and providing actionable recommendations to reduce costs and improve efficiency.

The image shows an aerial view of a modern building complex surrounded by streets, car parks and green spaces. In the centre of the image is a large, curved building with a roof surface that is completely covered with solar panels. The solar panels are arranged in several parallel rows and utilise the entire roof surface. Below the curved building is a wide road that winds around a circular green area with a tree in the centre. This road separates the main building from another large, rectangular building, which is located in the lower left-hand section of the picture. This building has a flat roof and is surrounded by grey paved areas and other green spaces. At the top of the picture is an extensive park with various footpaths running through it. There are numerous trees and shrubs in the park, creating a natural and green environment. At the top right of the picture is a long, straight road that separates the park area from the rest of the grounds. Another road is visible on the left-hand side of the picture, which also has a cycle path and footpath to the left and right of the road. Yellow markings show an entrance to the building complex which is blocked by a barrier.

Renewable Energy - SolarPV

Power your future with a clean, efficient, and sustainable solar energy system.

View inside a multi-storey office building with an open atrium and numerous glazed workspaces. Corridors, meeting rooms and open-plan offices can be seen on several floors, where employees are working at desks or standing in small groups chatting. Warm light from the interior contrasts with cooler exterior light, clearly highlighting the structure of the glass façades and metal beams. Plants and furniture add a relaxed touch to the modern rooms. The scene conveys a professional, lively working day in a contemporary office complex.

LED Lighting

Upgrade to energy-efficient LED lighting solutions, reducing energy consumption and maintenance costs while enhancing lighting quality across residential and commercial properties.

An industrial technician wearing a yellow safety helmet and dark work clothes with reflective stripes operates a machine in a production or technical hall. He wears red protective gloves and extends his right arm to work on a control lever or component, while stabilising his position on the unit with his left hand. Metal housings, pipes and technical components can be seen around him; in the background, other machines run along a narrow work area. The scene shows the maintenance or operation of a system and conveys industrial work processes and safety protection in the workplace.

Pump Optimisation

Maximize energy efficiency and system performance with our pump optimization solutions, reducing operational costs and improving reliability in your heating and cooling systems.

A service technician is working on a flat roof next to a row of large air conditioning or ventilation units. He is wearing a hard hat and a reflective safety vest and is kneeling in front of the units. He is holding a tablet or clipboard in his left hand, while his right hand is touching one of the units, as if he were checking its condition. The housings of the outdoor units are lined up in a row and feature round fan covers. In the background, roof structures and a sloped surface with solar panels can be seen, above which is a bright sky. The scene conveys the maintenance and inspection of technical building equipment.

Replacement of low EER ACs

Upgrade from outdated low EER air conditioning units to our latest technology-driven, high-efficiency systems—delivering energy-saving, cost-effective, and environmentally sustainable cooling solutions for commercial and residential properties.

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 comprehensive carbon audit and reporting services, helping you meet sustainability goals and comply with environmental regulations.

Property services

Optimise your property management with ista’s targeted services, designed to ensure efficiency, compliance, and sustainability across your operations.

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 SmartValve services, using real-time data and automation to optimize flow, reduce energy consumption, and enhance performance.

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

Improve indoor air quality with advanced technology and compliance support.

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 & Billing

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

ista's comprehensive services are just one click away.

Our expert customer team is dedicated to finding the perfect, tailor-made solution for your needs, ensuring your satisfaction every step of the way.

Facts & Figures

6,300 employees

20 countries

3.7 mil. t CO₂ emissions avoided

14 mil. utilisation units