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6. Costs and deadlines
The costs indicated are only orders of magnitude, but can be used for a rough comparison of sites.
The cost of plants (including civil engineering) operating in both directions with a mean tidal range H of 5 to 8 m is probably in the order of e1,000 to e1,500/kW for a use equivalent to 3,000 h at full power. Plant investment per kW per year is therefore 0.3 to 0.5 e (Russian projects are approaching 4,000 h/year).
The economic impact of dikes varies essentially with the length of dike per km 2 of basin, whose annual production in GWh is of the order of 0.7 H 2 (25 GWh for 6 m). For a dike cost of e3,000/m 2 , i.e. e75,000/m and a dike length of 200 m per km...
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