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Why are tidal and geothermal power projects limited to certain geographic locations?

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Civil engineering — civil engineering Barge in a lock on the Grand Canal d'Alsace at Marckolsheim, Alsace, France.

Tidal and geothermal power projects are geographically restricted because they rely on specific, naturally occurring conditions that are not universally available.

Geothermal Power

Geothermal energy is primarily harnessed in regions with high thermal gradients, such as areas near tectonic plate boundaries or volcanic "hot spots" where the Earth's crust is thin. These locations provide the necessary heat, water, and permeable rock required to access underground steam or hot water to drive turbines. While enhanced geothermal systems (EGS) are being developed to reach deeper resources in non-volcanic areas, traditional plants remain limited to these rare, seismically active regions where the resource is economically accessible.12

Tidal Power

Tidal power is limited to specific coastal areas where the tidal range is significant, such as the Bay of Fundy or the English Channel. These projects require either large differences between high and low tides to operate barrage systems or fast-moving ocean currents for tidal stream systems. Furthermore, the high capital costs of constructing the necessary damlike structures often make these projects prohibitive in all but the most suitable locations.345