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What is the round trip efficiency of this system? --Jaded-view (talk) 00:02, 12 April 2009 (UTC)
This paper says: "PHES systems are highly efficient, capable of reaching and surpassing 80-85% round-trip efficiencies." I googled around but did not see a reliably reported figure for the efficiency of the Raccoon Mountain plant. Here's a guy who claims 80% round-trip efficiency for Raccoon Mountain, citing verbal communication with the plant engineers on-site. Note that the Francis turbine was 90% hydrodynamically efficient way back in 1848. Modern Francis turbines are over 90% efficient. Given the high efficiency of large electrical generator/motors, round trip efficiencies of 80% for pumped storage sound believable. --Teratornis (talk) 07:44, 18 August 2010 (UTC)
Care to add something from those sources to the article? That'd be useful information for readers. Will Bebacktalk 07:49, 18 August 2010 (UTC)