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Hydropower under the EU Taxonomy
Hydropower qualifies through three alternative routes: run-of-river plants without an artificial reservoir, plants exceeding a power-density floor, or plants demonstrating life-cycle emissions below the 100 gCO2e/kWh threshold. The mitigation case is rarely the problem; hydropower assessments are decided in the water and biodiversity DNSH, where river ecology requirements are the most demanding in the energy chapter.
Why this activity matters
Hydro remains Europe’s largest source of renewable electricity and its most valuable flexibility asset, but reservoirs can emit methane and dams alter river systems, which is exactly what the criteria address. The three-route structure lets low-impact configurations qualify simply, while reservoir plants evidence either sufficient power density or a life-cycle assessment.
The centre of gravity is DNSH: the water criterion imports river basin management obligations, ecological flow, sediment management and fish migration measures. Refurbishments and existing fleet assessments are common commercial cases, since alignment supports both green financing of upgrades and utilities’ Taxonomy KPIs.
What alignment requires
Three alternative substantial contribution routes, then demanding water DNSH. In summary:
| Area | What is required (summarised) |
|---|---|
| Route 1: run-of-river | The plant is a run-of-river installation without an artificial reservoir; qualifies without an emissions calculation. |
| Route 2: power density | Power density above the floor (in the region of 5 W/m2 of reservoir surface), demonstrating efficient use of the impounded area. |
| Route 3: life-cycle emissions | Life-cycle GHG emissions below 100 gCO2e/kWh, evidenced by an ISO-compliant assessment covering reservoir emissions. |
Summarised for orientation; the assessment itself applies the full criteria text of the Delegated Acts as amended.
Where DNSH scrutiny falls
The decisive area: compliance with river basin management plans, ecological flow maintenance, sediment management, and fish migration measures (passes, screens).
EIA outcomes and, for sites affecting protected rivers or areas, appropriate assessment and mitigation.
CRVA including hydrology change over the asset life; drought and flood scenarios both matter for hydro.
Documentation that typically supports the assessment
- Plant configuration (run-of-river or reservoir), capacity and reservoir surface data
- Life-cycle assessment where the emissions route is used
- Water permits, ecological flow requirements and river basin management plan status
- Fish migration and sediment management measures
- EIA / appropriate assessment documentation
How Censatim assesses it
Our questioning first fixes the configuration, because it determines which of the three routes applies and how much evidence the mitigation case needs, then moves to the water DNSH, where hydropower assessments are genuinely decided. Plants with current water permits and documented mitigation measures assess quickly; legacy plants with unresolved ecological flow questions surface those as precise information gaps.
Censatim is an expert-built EU Taxonomy assessment tool: describe the asset or activity in plain language, upload supporting documents, and answer a short set of targeted questions. The result is a criterion-by-criterion view with an In-line / Partial / Not aligned / Undetermined rating and a confidence level for each dimension. See the full methodology.
Frequently asked questions
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