<a href="http:&#x2F;&#x2F;beaconpower.com&#x2F;operating-plants&#x2F;" rel="nofollow">http:&#x2F;&#x2F;beaconpower.com&#x2F;operating-plants&#x2F;</a> but there are others, some even quite old. More often selected for niche reasons than market peak load balancing. e.g. site one at long end line of insufficient frequency stability.