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About
the project

Thalis1 is a flagship green hydrogen (GH2) infrastructure project developed by Idea Investments, set to become one of the largest utility-scale hydrogen initiatives in Southeast Europe.

 

The project is designed to produce up to 140,000 tons of green hydrogen per year through electrolysis powered primarily by a dedicated 2,100 MWp photovoltaic (PV) plant and supported by additional grid input compliant with the RED III Directive.

The project will be developed in two phases, each featuring 600 MW of electrolyzer capacity, reaching a total of 1,200 MW at full deployment.

 

Phase 1 is expected to be operational by 2031, followed by Phase 2 in 2032.

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Components

Energy Source

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2,100

MWp dedicated

solar PV plant

Electrolyzer Capacity

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1,200

MW total

(2 x 600 MW)

Transmission Line

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37 

km private

400kV high-voltage TML

Water Supply

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Recycled residual wastewater from Thessaloniki WWTP

Export Capability

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Via H2DRIA Hydrogen Pipeline

+ EHB

Location

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Northern Greece (strategic EHB access)

Capital Expenditure Plan

All these elements are included in the capital expenditure (CAPEX) plan, which also encompasses permitting, environmental assessments, and infrastructure development.

Since its initial concept and submission to the previous PCI/PMI process, Thalis1 has matured significantly.

 

The project has:

  • Completed its preliminary feasibility study

  • Scheduled formal Flagship Investment application in Q2 2026

  • Strategic Environmental Impact Assessment and Spatial Planning (Pending application)

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