I'll start with the second question.
With respect to the jurisdictions that already have solar electricity generation, the penetration currently is still very low. At this point, in many cases the solar electricity is being consumed at a local level and isn't finding its way to the transmission system. In those instances, transmission infrastructure is quite often not needed either within the region or inter-regionally.
To build on something that Mr. Robertson said, when you begin to have higher penetrations of wind and solar and other resources—for example, in Alberta—the wind resource is very strong in the winter and at night, whereas the solar resource is excellent but is also the opposite: it's very strong during the summer and during the day. When you have very high penetrations of wind and solar, the majority of the time you have just the right amount, but when you have too much of one or the other, it helps to share with your neighbours and to balance between the two.