I have had my pool for over 15 years and it has become painfully necessary for me to attempt to derive a monthly cost of the electricity used by this pool pump. My best guesstimate, is at least $100.00 monthly. If anyone can offer any assistance it will be greatly appreciated, thanks in advance! I am guessing you need to know the capacity, it is 33,000 gallon. The size of the pump is 2HP and I just replaced that pump this summer. Any further information, please let me know. Also, I live in TN and the pool is only open approximately 4 months annually.