What your power meter sees
The power meter which is usually installed on the exterior of your building, is connected to the power utility usually from a Transformer either on a pole close to your building or by a pad mounted transformer sitting on the ground…

The transformer is normally connected to series of local buildings, from a pole mounted oil filled with overhead wires at approx.. 7000 to 13,000 volts, up to a pad mounted air cooled transformer feeding underground wiring to your building at 35,000 volts. The transformers are supplying 240 volts with a tap to ground mid way giving a dual voltage of 120/240 volt..
Depending on the size of your building ( home), the supplied service at the panel will be from 100 amp up to 400 amp and all points in between. The size of the service is based on square footage calculations and load calculations based on the number of outlets and special requirements such as Hot tubs, Saunas, electric appliances, such as stoves, dryers and alike..
Here are some basic calculations to see what your meter will see and how the utility charges you…
Lets say for argument sake, that you still have a 100 watt incandescent light bulb… if you have that bulb on for 10 hours, then its 100 times 10 = 1000 watts or simply put 1 Killowatt.
Since Ontario is using TOU rates, the cost to turn on your lights in 2010
Was much cheaper than it is in 2015.
The peak times change how much you pay ..
For example if that 100 watt lamp on for 10 hours is 1kw, then the rate is calculated at 1 KWH, therefore in 2010 during on-peak it would cost your 9.9 cents while in 2015, the cost would be 17.5 cents.(ouch).
To calculate how power is being used. We have to understand what power is compared to voltage and Current…
Voltage is what is running your appliance and is basically the push of how much electricity is being used to supply that light..
The Current is based on how much work your appliance is using , therefore, lets calculate an item plugged into a normal 120 volt receptacle and it is pulling 5 amp from your service… this is calculated at 5 times 120 or 600 watts.
Not everyone is interested in the amperage or current unless they want to know if your fuse or circuit breaker can handle it..
Therefore, many appliance have a watt rating.. such as a kettle or toaster oven listed at 1200 watt which is easier to calculate power usage.. but if you wish to know the current or amperage used, simply take the wattage and divide it by 120 which will calculate to 10 amp.
There are other factors affecting usage but for simple calculation we are not taking the other factors into this…
So lets talk about a morning when your making your coffee and toast at 8 am which is mid peak at 12.8 cents per Killowatt hour.
Simply add it all up..
Your kitchen light is on at 100 watt for 2 hours, your toaster is on for 4 minutes at 1200 watt, your kettle is on for 4 minutes at 1500 watt.
Total  of the appliances would be 2700 watt or 2.7kw for 4 minutes or 180 watt hour since its only 4 minutes plus your light at 100 watt for 1 hour or 100 watt hour totals to 280 watt hour or .28kwh based on 12.8cents per KWH or about 2 cents.. sounds cheap right??? Well figure out how many items are running in our home during the day..
Your furnace, or AC, your fridge(s), light(s), fan and the conveniences that make your house a home… then calculate that over an average of 2 months based on the three time of use costs..
Lets have a look at my personal power bill, during the winter months, my nominal usage 1200KWH while in the summer its about 1600 KWH over two months, the cost will change based on time of use. Besides all this, the utility charges a delivery charge based on how much power is used plus a regulatory charge which  in my case adds another 60 to 90 dollars on my bill before HST (double ouch), and yes you can drop the KWH used as by watching your time of use, you can drop cost quite a bit.

please view our video on real time power usage using simple and reasonably priced power monitors