ista Customer Service GmbH provides real estate services with a focus on energy management and has been embedded in the ista Luxembourg S.à r.l. group since the start of operations on April 1, 2021. The company delivers customer service for its sole client (ista SE), notably issuing energy certificates and EcoTrend, and is remunerated under a cost‑plus contract with a 3% profit surcharge. It operates two service centers in Leipzig (387 employees, prior year 400) and Kassel (109 employees, prior year 113) and employed an average of 501 staff in 2024 (387 full‑time, 114 part‑time). Within the group, main markets are in Europe—especially Germany and France; the group reports over 65 million installed meters and serves over 290,000 customers and more than 5 million households in Germany, placing iCS in a strong sub‑metering market environment.
Immobilienwirtschaftliche Dienstleistungen aller Art, insbesondere im Bereich Energiemanagement.
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Source: German Commercial Register (Handelsregister) Essen Local Court, HRB 31011 (as of 28 September 2026)
Source: German Commercial Register (Handelsregister) Essen Local Court, HRB 31011 (as of 28 September 2026)
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Source: German Commercial Register (Handelsregister) Essen Local Court, HRB 31011 (as of 28 September 2026)
AGROLAB Labor GmbH
Bruckberg · Alle anderen Tätigkeiten typischerweise freiberuflicher, wissenschaftlicher oder technischer Art a. n. g. (ohne Künstler- und Modelagenturen)
Ecosia GmbH
Berlin · Alle anderen Tätigkeiten typischerweise freiberuflicher, wissenschaftlicher oder technischer Art a. n. g. (ohne Künstler- und Modelagenturen)
Zalaris Deutschland GmbH
Hagen · Alle anderen Tätigkeiten typischerweise freiberuflicher, wissenschaftlicher oder technischer Art a. n. g. (ohne Künstler- und Modelagenturen)
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