geothermal comparisons, page-8

If positive results are achieved by the leader GDY, then then great leverage can be realised through GDYO. Every GEO, including GRK, will benefit from this, but GDYO should be best suited to returning the highest profits in the medium term.
At the moment, GRK appears to be the furthest from establishing a viable operation, and it's current market cap is justified by this fact. Investing in GRK is somewhat more speculative than PTR or GHT, which is fine for some, but for my money the Geothermal concept is speculative enough, without introducing further development risk from an unfunded GRK.
GRK is simply not going to be producing the SP-increasing results as soon as GDY, GHT or PTR.
So whilst it may be a company with potential, there may be better oportunities when considering the upcoming events in the sector.

Just my personal thoughts. I do not think GRK is going to perform poorly - I would just expect GDY, GDYO and PTR to deliver similar if not better returns for less risk over the next few months.

I hold GRKOA as the 'speculative punt' part of my portfolio, due to financing and development risk.