You sure you still want to run the S2?
Specifications Antminer S2:
Hashrate: 1,000GH/s (1 TH/S)
Power consumption: less than 1,100W from the wall
those are s4's and they still turn a profit for me , i have .6 MW of power available so its not like im hurting for power for the s7/s9's
thats almost 1400 watt for 2 terrahash, you have free energy?
not free but very very cheap , the more i use the cheaper it gets as well
Where are you located? You are very lucky with your electricity prices
I wish I had those prices then I could mine too 
You should consider hosting other peoples miners so you can get even cheaper electric.
utah, usa . i do host for some ppl mostly ppl ive made friends with from various mining pools.i just dont advertise it, but if anyone needs some small scale hosting i can do it( i.e 1-4 machines etc ) i have no interest in hosting large mining operations i.e 50-100 machines etc