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HOFOR, VEKS, and CTR strive for being CO2-neutral in 2025. To achieve this, they focus on existing and well-known technologies but also on new and less tested technologies. Among these, electric-driven heat pumps (HPs) are a promising opportunity. They can utilize low-temperature heat sources otherwise not exploited: geothermal energy, industrial excess heat, sewage water, seawater, groundwater, and ambient air.