The Mota‑Engil‑led consortium plans to submit a revised environmental project to the Portuguese Environment Agency (APA) for the two Porto–Lisbon high‑speed (TGV) subsections in Gaia that the APA deemed non‑compliant on 20 December. The new submission is expected by the end of Q1; it must address the APA’s compliance concerns — likely shortcomings in environmental impact assessment, mitigation measures or route design — for the scheme to progress. Approval timing will be decisive for the project’s schedule and costs: if the APA accepts the revisions, the programme can move on to later permitting and procurement stages; further objections or additional information requests would delay construction and raise political and commercial risks for the consortium.