You can figure that out yourself. Electricity usage is charged in kilowatt hours (kWh). That means if you can figure out how many watts you use over the hours of each day, you can figure out how much you're paying.
For example, if you run your two 250W halides 10 hours a day - that's 2 x 250 x 10 = 5,000 watt hours or 5 kWh. Multiply that by whatever BC Hydro is charging per kWh and you have your daily usage. Simply multiply by 30 for the amount you are paying per month. Now you just have to add up all of your pumps, lights etc. to figure it out.
For things like lights and return pumps it's easy because you know exactly how long they are on, but with heaters and powerheads on wavemakers it's a little trickier.
Adding up watts via the labels on the back of each electrical device gets you the nominal power usage. You can purchase devices such as a "Kill-A-Watt" that can measure actual power usage.
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