How Much Green Energy Does netcup's Parent Company Anexia Generate Itself?

At a Glance

• Two hydropower plants plus a solar park: Kammern (600 kW), Fressnitz (600 kW), and the Jaidhof photovoltaic park (around 1 MW) together add up to roughly 2.2 megawatts of installed capacity (as stated by Anexia Energy, accessed 09/11/2026).
• Kammern covers, on average, around a third of the electricity demand at the Vienna data center site (Datasix).
• The Jaidhof solar park generates around 1,127 megawatt hours per year on 1.16 hectares with 1,428 solar modules, which, according to Anexia, covers nearly another third of the demand at the Vienna site.
• netcup has been certified to ISO 14001, the environmental management standard, since 2023, audited annually by TÜV Nord Cert GmbH.

Which Power Plants Does Anexia Operate for Its Data Centers?

Only for the Jaidhof solar park is the annual output publicly disclosed, around 1,127 MWh per year. No published figures exist for Kammern or Fressnitz, so the combined total of all three plants is likely higher than this number.

The Kammern hydropower plant was transferred to Anexia on May 10, 2024, the group's first in-house generation facility. According to Alexander Windbichler, around 12,000 tons of water plunge through a pressure pipeline every second, using a drop in the 40-kilometer Liesing river. The electricity flows directly into the operation of Anexia's data centers, above all into the Vienna data center Datasix, to which netcup is connected as a subsidiary.

Fressnitz was added as the third plant after Kammern and Jaidhof and, according to Anexia Energy, generates around 600 kW. Design flow rate, head, and the pressure pipeline are not publicly documented in detail. The company behind it belonged to a different owner until the end of October 2025 and has since operated as Hydro Power Fressnitz GmbH, a wholly owned subsidiary of Anexia Energy.

Native shrubs were planted around the Jaidhof solar park, along with a wildflower meadow that is mowed only once a year, creating habitat for flora and fauna in this intensively farmed agricultural area.

How Has Anexia's Carbon Footprint Developed?

Source: 2025 Environmental Report, Anexia Group, key figures based on EMAS core performance indicators, first collected in 2025.

Total emissions rose in 2024, according to the environmental report mainly due to increased demand for data center hardware. Looked at in isolation, excluding data centers and employee mobility, the corporate carbon footprint of on-site activities fell by 7 percent in 2024. The 2024 target of an overall 5 percent reduction was therefore missed overall.

What Environmental Goals Is Anexia Pursuing for 2025 and Beyond?

• Increase the share of renewable energy in data center electricity in Austria and Germany to 60 percent.
• Increase the self-supply rate with renewable energy in Austria to 75 percent.
• Increase the share of electric vehicles in the fleet to 50 percent.
• Train the entire organization on current environmental and sustainability topics at least twice a year.
• Reduce overall resource consumption and waste generation.

As one of the measures for the 2025 goals, the environmental report names, among other things, the purchase of additional power plants and an improved energy mix at further data center locations.

These figures are targets for 2025, not confirmed actual values. Whether they were achieved will likely only be published in the next environmental report.

Which Certificate Backs Up the Environmental Management?

netcup has been certified to ISO 14001, the environmental management standard, since 2023, the Anexia Group as a whole since 2022 already. Both certificates are audited annually by TÜV Nord Cert GmbH. netcup and Anexia also hold further certificates for quality, information security, and data protection, details on the netcup certifications page.

What Does This Mean Specifically for netcup Customers?

For private and smaller hosting customers, nothing changes about the product, the green power share is part of the existing infrastructure and not an add-on tariff. For business customers with their own sustainability reporting, for example under CSRD, the ISO 14001 certificate and the annual environmental report can serve as supplier evidence. One trade-off remains: the figures apply at group level, there is currently no way to calculate one's own server consumption individually against the power plant output.

Which netcup Products Fit

• Root servers and vServers for private and small business customers run at no extra charge on the same infrastructure that also utilizes the company’s own energy generation.
• Managed Private Servers for business customers are suitable when supplier data is needed for your own ESG reporting.
• The Vienna server location is the one directly connected to the power plants described above.

Methodology and Data Sources

The figures in this article come from public Anexia and netcup sources. All values are group-level figures for the Anexia Group, not netcup-specific measurements. The full list of sources with links and access dates is at the end of the article.

Transparency Note on This Data

• Group level, not subsidiary: All power plant and environmental figures are consolidated figures for the Anexia Group. There are no isolated, netcup-specific measurements.
• Unclear data situation (Kammern power plant): The exact annual output for Kammern is not published. In addition, the publicly stated figures on coverage at the Vienna site show a range: an early statement from October 2024 ("entire consumption") stands alongside Anexia's later figures of, on average, "a third."
• Hardware growth outpaces efficiency gains: The group's corporate carbon footprint rose overall in 2024. Self-generated green power does not automatically lower absolute emissions as long as the hardware demand of the data centers keeps growing this fast.

Sources and related netcup pages

1. Green Electricity and Energy Efficiency, netcup, accessed September 29, 2026
2. Certifications, netcup, accessed September 29, 2026
3. Vienna Location, netcup, accessed September 29, 2026
4. About Us, Anexia Energy, accessed August 24, 2026
5. Our Power Plants, Anexia Energy, accessed September 11, 2026
6. 2025 Environmental Report, Anexia Group, PDF, accessed September 29, 2026
7. “Why Cloud Provider Anexia Is Now Buying Power Plants in Austria,” Kleine Zeitung (Uwe Sommersguter), reprinted on the Anexia Blog, November 28, 2024, accessed August 24, 2026
8. “Hydropower Plant for Cloud Servers,” Kronen Zeitung (Christian Tragner), reprinted on the Anexia Blog, October 29, 2024, accessed August 24, 2026