CryptoNight algo coins' power-cost is lowest in all of them.
More info from -
www.cpu-coin.comI would expect Cuckoo Cycle to be (significantly) lower, since it's memory-latency bound rather than compute bound...
Can you download the source code from
https://github.com/tromp/cuckoo and measure the power-usage while running e.g.
make speedup
?