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A lot of people are monitoring, and some are controlling, their electricity consumption with OEM equipment and software. But as I'm not familiar with installation practice in Quebec, you'll have to do some reading and investigation yourself - or explain exactly what you mean by monitor directly from [the] breaker panel. You might also need to check up on what you're allowed to touch - a local competent electrician should be able to tell you.

Basically, our system was designed for UK practice where we have a single phase TNS or TNC-S system, 240 V, 50 Hz with a rating of either 80 or 100 A, and the primary monitor is on that incomer. But many people want to and do measure individual outgoing circuits.

So really, within the constraints of what you can safely and legally access, the choice is yours. You might like to read the article in Resources > Building Blocks about using the emonTx in N.America, as that might apply to you.

There's also a very long thread (that was started before that article was written!): http://openenergymonitor.org/emon/node/3265 that you might like to look at.

Thank, what i mean by directly monitor from the breaker panel is if i put a sensor CT directly around each wire of each breaker on my panel  like this:

If its possible,i will ask my electrician to help me out with the installation.

Thank for the forum thread , i will have look.

I understand now. Yes, you can do that, but as the emonTx has only 4 current inputs, you will need a lot of emonTx's. A much less expensive solution will be, if your skills are up to it, to make a custom 'front-end' for a much higher powered Arduino variant that has a lot of analogue inputs. It has been done, so if you search the forums, you should find some references.

Someone has already made a 32 input front end for emonCMS.  Take a look at this unit:

http://www.brultech.com/store/product.php?id_product=108

Great! Thank you for your answer, i will look at this and come back with my choice,

Have a nice day!