A seasonal storage facility like the LM-C option (Liquid Methane-Cycle) presented in Easa I. Al-musleh et al. ^[1] requires: reversible fuel cell system, liquefaction train, storage tanks for cryogenic liquids, reactors for the Sabatier reaction and all the rest of components necessary in a chemical site (heat exchangers, flahs drums, distillation/absorption columns, power system, etc). Nevertheless it has only been possible to calculate the cost for the first three elements of the list, as the published data is not detailed enough to assess a complete plant cost estimation.

Nowadays no reversible fuel cell can be found on the market. Electrolizers and fuel cells can be bought but the reversible technology is still under development. Due to the lack of data about this technology, the cost of reversible fuel cells has been assumed to be equivalent to the cost of advanced cogeneration systems.

*It is assumed to be the 5% of the investment cost.

*It is assumed to be the 5% of the investment cost.

[1] Oxford Institute for Energy Studies (2014), LNG Plant Cost Escalation

[2] Kåre Hjorteset et al. (2013), Development of large-scale precast, prestressed concrete liquefied natural gas storage tanks.