1336 (HAZID) study has already been conducted to assess the acceptability of major hazards and define actions for subsequent design stages. The primary purpose of the coal mining benchmarking (CMB) will be to develop and test a mechanism to investigate the feasibility of multiplying the solution by repurposing former coal mines into green hydrogen plants, where green hydrogen may be produced by other mining companies (including in other locations, e.g., Poland). Implementation of activities will include: (i) identification and description of the technological and operational parameters of the solution based on the work carried out ; (ii) identification of the economic conditions for the implementation and operation of the investment; and (iii) testing the tool for selected locations and formulating recommendations for the business model. The overarching aim of the CMB process is to structure the assessment process, assess the solution's feasibility in selected locations, and raise awareness among decision-makers responsible for investment and development strategies. Critical paths to implementing alternative activities on former mine sites will be identified. Communication, dissemination and exploitation are designed as continuous activities to accelerate stakeholder learning and uptake. Planned measures include an updated project website (https://minetoh2project.uniovi.es/) with a consultation area, annual newsletters, and a promotional video. The communication plan proposes a multi-channel approach that combines a web presence, professional networks, social media, and targeted events to reach authorities, industry, civil society, and international platforms. 5. PRELIMINARY FINANCIAL ANALYSIS A preliminary economic assessment of the green hydrogen plant, without considering the blending operation and PV installation, was developed to assess the project's likely feasibility. According to the detailed budget presented in the proposal, the capital expense (CAPEX) required, including demonstration operating costs, is shown in Table 1, excluding value-added tax (VAT). Table 1 – MINE-TO-H2 project CAPEX Description Estimated cost (EUR) 2.24 MWp Photovoltaic plant 2,020,000 Electrolyser system 3,200,000 Mine water feeding and treatment systems 220,000 Hydrogen storage and refuelling systems 4,323,220 Electrical system connection 324,000 Mechanical & electrical balance of plants 1,870,000 Digital Twin and Artificial Intelligence software 110,000 Rental of equipment 187,850 Personnel costs 400,000 TOTAL CAPEX 12,655,070 The technical and economic parameters required for cash flow calculation are presented in Table 2. Financial outcomes will be calculated over 20 years, with depreciation periods also of 20 years for the green hydrogen plant and the photovoltaic installation.
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