Offshore renewable energy subsea heat bank

A system comprising:

• a renewable energy source configured to generate electrical power;
• a subsea flowline buried underneath a surface of a seafloor;
• and
• one or more heater cables surrounding the subsea flowline, a gap present in the seafloor between the one or more heater cables and the subsea flowline, the one or more heater cables configured to:
• receive the electrical power from the renewable energy source and heat the subsea flowline to a temperature at least a threshold above a temperature necessary to prevent hydrate or wax formation within the subsea flowline, the heating of the subsea flowline based on the electrical power;
• and
• store excess heat generated by the one or more heater cables in a heat bank underneath the surface of the seafloor, the heat bank surrounding the heater cables and the subsea flowline, the excess heat based on heating the subsea flowline to the temperature above the temperature necessary to prevent hydrate or wax formation, the excess heat decreasing a heat loss of the subsea flowline when the power from the renewable energy source is insufficient to heat the one or more heater cables to the temperature necessary to prevent hydrate or wax formation within the subsea flowline.