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Sustainability 2017, 9, 106 18 of 19

order to sell the surplus of energy into the electrical grid. In this way, with a double installed power
of wind and sea wave farms, the breakeven time is about 14 years. The introduction of an incentive
related to the annual distance covered by hydrogen buses and/or the selling of electrical surplus can
be a successful way to reduce the breakeven time, making this project feasible.

Author Contributions: All authors contributed to writing the article on equal terms. All authors read and
approved the final manuscript.
Conflicts of Interest: The authors declare no conflict of interest.

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