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Hydro turbines, the oldest and also the mostly used renewable energy source, hold the highest efficient of power conversion process. The potential head of water is available next to the turbine, so there aren't any energy conversion losses, exactly the mechanical and copper losses inside the turbine and generator and the tail end loss. The efficiency is inside the range of 85 to 90 %.
The concrete (usually with steel bar) is poured directly into the stable and solid roadbed, and the new line of ordinary sleeper and gravel bed is not used. This kind of line is clean, suitable for large volume and difficult maintenance area, especially for tunnel, underground railway, port wharf and stone road base. But its construction investment is big, if because of the construction slapdash or basement instability, concrete layer fracture, cure difficulty. China's overall Taoist route in the tunnel is more than 300 kilometers long
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