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by Linda Bertelsen

ista is one of the world’s leading companies providing energy management and billing services for improved energy efficiency and heating and water consumption transparency in buildings, serving over 12 million consumers in apartment buildings and commercial properties across 25 countries.

We assist customers, landlords, and tenants to deliver transparency through heat and water metering, heat cost allocation, data collection, and reporting within Community and District Heating.
Formerly Clorius (now ista), founded in Denmark in 1902, we leverage our considerable history and experience within our state-of-the-art reporting and billing services. Whether credit or pre-payment systems, these provide clarity and security for landlords and utilities so that their consumption and heat delivery are appropriately and efficiently measured, optimized, and billed. Energy, costs and CO2 can be significantly reduced with very low investment. Our comprehensive ‘Meter Data Management’, ‘Energy Management Visualisation,’ and ‘Billing’ platforms show our customers the cost/savings available and achieved in measuring and managing their utilities.

We achieve further efficiency gains in buildings by offering supplementary services, including smoke alarms, humidity monitoring, temperature/climate analysis, energy advice, and our energy contracting services.


  • District heating
  • Energy efficiency
  • Metering
  • Water


All regions

Contact info

ista Danmark
Brydehusvej 13, 2750 Ballerup, Denmark Tel: +45 7732 3232
Benny Mathiesen
CEO, Regional North hos ista Danmark A/S
benny.mathiesen@ista.dk Tel: +45 7732 3314
Alex Philbrook
Managing Director, ista UK