The article discusses the innovative approach of enhancing green energy production by introducing the FPLM-H2 storage and transportation unit to the Power to Gas (P2G) system. By utilizing renewable energy sources to produce hydrogen and then reacting it with CO2 to generate methane, this system aims to contribute to carbon neutrality efforts. A new digital twin model was constructed to simulate the performance of the FPLM-H2 unit, showing promising results in terms of adaptability to offshore conditions and the overall liquefaction efficiency. Catalyst research focusing on Ni-based catalysts loaded on various carriers has demonstrated high CO2 conversion rates and methane selectivity, highlighting the potential for efficient methane production. The article also emphasizes the advantages of liquefied methane (LM) over hydrogen in terms of storage and transportation, leveraging existing LNG infrastructure for cost-effective operations. Furthermore, studies on green hydrogen production methods through offshore wind and solar energy showcase a promising avenue for sustainable energy generation. Overall, the article underscores the potential of the FPLM-H2 unit in enhancing the P2G system and promoting the utilization of renewable energy for methane production.