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- Natural Hydrogen Prospectivity in Portugal: A first approachPublication . Portillo, Juan C. C.; Ferreira, Pedro Tavares; Sampaio, José; Batista, Maria Joao; Represas, Patricia; Ramalho, Elsa; Machado, Susana; Carvalho, JoãoABSTRACT: This works presents the first maps of the prospectivity of natural hydrogen in continental Portugal and the methodological approach undertaken. The methodology used in this study follows the Chance of Sufficiency (COS) approach, which is also sometimes referred as the Chance of Success in exploration geoscience. It is a probabilistic estimate of whether a geological prospect contains a resource (e.g., hydrocarbons, hydrogen, etc.) in sufficient quantity and quality to be considered a "success" or explorable. It is typically expressed as a percentage and reflects the likelihood that all critical geological factors align to yield a viable accumulation. COS is grounded in Bayesian probability and statistical modelling. It is often calculated by multiplying the probabilities of independent geological favourable factors, such as sources (presence of a generating system), reservoirs (porosity and permeability), seals (cap rock to trap fluids), trap (structural or stratigraphic configuration), timing and migration (alignment of generation and trap formation). In this study only the first three were considered (i.e. sources, reservoirs, and seals). Consequently, this work should be seem as a first approach for the prospectivity of hydrogen mapping in Portugal.
- Stakeholder views of land conflicts in utility-scale solar energy: toward a spatial assessment toolPublication . Alves, André; Simoes, SofiaABSTRACT: Renewable energy sources (RESs) power plants, particularly solar photovoltaic (PV) infrastructure, are being deployed at an unprecedented scale to allow the transition to carbon neutrality. Rapid expansion of PV facilities cannot proceed without careful consideration of spatial planning and environmental impacts. Although social acceptance of RES is generally high, there is little consensus on where such plants should be located, as stakeholders perceive their impacts in diverse and often conflicting ways. This study aimed to (i) assess the spatial distribution of planned utility-scale solar power plants (SPP) in Portugal in relation to environmentally and culturally sensitive areas; (ii) analyse stakeholder perceptions of SPP impacts across different land uses and territorial settings; and (iii) develop an impact index that incorporates stakeholder information to classify PV projects by degree of impact. An online survey was conducted to examine perceived impacts associated with SPP development, and a classification methodology was designed using an additive aggregation method to produce a geographic information system-based index to classify projects. The questionnaire answers reveal substantial heterogeneity in individual preferences but also indicate intragroup convergence and intergroup divergence among stakeholder groups. The impact index provides a framework for classifying land-use conflicts related to large-scale solar projects and enables preliminary assessment of planned developments in relation to stakeholder alignment. These findings contribute to spatial energy planning by demonstrating how stakeholder perceptions of land-related impacts can be operationalised to inform siting decisions for RES plants.
- Land use planning and safeguarding of mineral resources: the case of PortugalPublication . Carvalho, Jorge; Lisboa, Jose; Salgueiro, RuteABSTRACT: An analysis of the Portuguese spatial planning policy framework and a sample of municipal master plans reveals that mineral resources are addressed within the context of extractive activities, not as natural resources worthy of safeguarding for extraction when society needs them. The approach to mineral safeguarding involves delimiting areas for the exploitation of geological resources on zoning maps and ensuring the compatibility of uses between agricultural and forestry areas with mineral extraction activities. However, practice shows that this is not adhered to in most master plans, allowing to conclude that the current legislative framework and practice severely restrict access to mineral resources.