Alter Enersun expects to supply up to 500 GWh a year to Onuba, although part remains pending

Two photovoltaic projects, with different levels of commitment

Alter Enersun expects to supply around 500 GWh a year of renewable electricity to Onuba, the first phase of the Andalusian Green Hydrogen Valley being promoted by Moeve in Palos de la Frontera (Huelva). The company has announced an investment of more than €250 million linked to this supply proposal.

The planned volume is not fully contracted. According to information released by the companies, 265 GWh a year would come from La Luz, a facility that is already operational and has a long-term supply agreement with Moeve. The remaining 235 GWh a year is attributed to Puerto Sostenible, which is still under development: a preliminary agreement exists for this volume, but its delivery depends on the project progressing and definitive contracts being concluded.

Power from both facilities is intended for the complex through local photovoltaic generation and direct self-consumption, together with long-term power purchase agreements, known as PPAs. Alter Enersun puts the combined potential generation capacity of La Luz and Puerto Sostenible at up to 750 GWh a year; this capacity is not equivalent to the volume already contracted for Onuba.

Renewable energy as part of industrial development

Onuba is under construction at Moeve’s Energy Park in Palos de la Frontera. According to the published information, the first phase will initially have 300 MW of electrolysis capacity, with the possibility of adding a further 105 MW. The total investment announced for the initiative exceeds €1 billion. Moeve is leading the project with a 51% stake; the other participants include Hy24, COFIDES, Enagás Renovable and Alter Enersun.

The facility could produce approximately 45,000 tonnes of renewable hydrogen a year. The companies estimate that it would enable emissions to be reduced by around 250,000 tonnes of CO₂ a year. These are projections associated with the project, not results from a plant that is already operational.

José Luis Morlanes, CEO of Alter Enersun, said the company would provide competitive renewable energy to an initiative that, in his view, would contribute to the decarbonisation of transport and industry and to energy autonomy. For his part, Miguel Ángel Devesa, Moeve’s Director of Hydrogen, said that moving towards large-scale renewable hydrogen production requires coordinating its various components, including access to competitive renewable energy.

Onuba is the first phase of the Andalusian Green Hydrogen Valley, which envisages a total electrolysis capacity of 2 GW. The announced energy agreement adds a supply component to industrial development, but the contribution attributed to Puerto Sostenible remains conditional on its development and the formalisation of the relevant contracts.