At Iceland's Kahnjkar Hydroelectric Plant, water is diverted from the Jkuls Dal river and descends 600 meters through underground water tunnels to...

At Iceland's Káahnjúkar Hydroelectric Plant, water is diverted from the Jökulsá á Dal river and descends 600 meters through underground water tunnels to the power station.  The maximum flow rate is 145 cubic meters of water per second.  The plant's maximum power output is 690 MW.  Estimate the efficiency of the plant (the maximum power output as a percentage of the total energy released by the water falling 600 meters at maximum flow).

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