In the current energy transition to reach a net zerocarbon scenario, the steel industry is one of the hardest sectors to abate, due to its high energy demand and the use of carbon for its synthesis. It has been proven that through changing the process of production, the carbon can be substituted with hydrogen, allowing a nearly fully eradication of the carbon emissions. However, the hydrogen must come from a renewable source at a constant supply due to the industrial production particularities. Currently, electrolysis is the most advanced technology to produce green hydrogen but is tied to the intermittent electricity supply from renewable sources. Energy storage systems for industrial volumes are with today’s technology an unfeasible option. On the other h and, alternative renewable sources such as wave energy, has demonstrated to bring a predictable, less variable, and complementary production profile to the conventional wind and solar energy. The study has been based on H2GS´s future steel factory in the I berian Peninsula including a 1GW electrolyser, that must be operational for 8000hours, equivalent to a 90% utilization. The paper suggests that when including wave energy to the supply mix, the total installed capacity can be reduced by a 46%. This leads t o a significant cost reduction where the LCOE is decrease by a 26%. Furthermore, the total AEP is reduced which implies less over capacity sold to the grid, where translating to a the technological and project risk reduction.