Outer space of The Matrix

[Metalogic]

I thought it was hinted that the machines had another power source beside the humans though. In The Matrix, Morpheus eluded to them using not only humans but a kind of fusion. This was also talked about in a few of The Merovingian critical missions. Of course they never went far with that idea, which is a shame because I think they should've.

As for them not simulating the whole planet, or even the Universe, how does one explain the newspaper article about Morpheus being spotted in Heathrow airport in London?