The Portuguese National Hydrogen Strategy, launched in 2020, relies on hydrogen produced via electrolysis using renewable electricity. It is currently under review, considering updated information and national goals. For producing renewable hydrogen and other derived renewable fuels of non-biological origin, many projects now being proposed or already being developed, rely on energy supply from the national electrical grid. However, it is shown that this approach is inadequate, especially for large scale projects. The optimisation of the renewable power mix for RFNBO production was addressed in the 2026 update of the 'carbon-neutrality in the energy sector by 2050' scenario (CN50), developed by the Directorate-General of Energy and Geology. Realistic power supply mixes were obtained that rely mostly on PV power, complemented with onshore and offshore wind power, and benefiting from otherwise curtailed energy from national electricity grid. Expected capacities for dedicated wind and solar power capacities for 2030 and beyond were obtained and related to exported hydrogen goals and national renewable energy share targets.