The ORC cycles work best on low temperature sources, if I recall correctly typically 120 deg C, hence for high temperature sources they are only used as a secondary cycle.
I believe you can use cascade ORC systems direct from high temperatures, but not aware of any being used. Probably because the cost involved in a primary flash steam cycle is so much cheaper than an ORC (or Kalina) for extracting the higher grade energy.
I am not knocking GDY, they may advance the technology more than PTR ever does, however I am investing in PTR largely because I believe they are more focussed on the economics (and much lower capitalisation). My view may change as these companies progress.
I did get PTR in the float, but sold all but 20,000. Bought some more recently.
Anyway good luck with your choice, they are all speculative at this stage.
EL
PTR Price at posting:
0.0¢ Sentiment: Hold Disclosure: Held
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