The PV monkeys while a fun idea turn out to be rather impractical.
However, the idea of having some sort of attached power hub may well have some scope. Instead of being a small PV monkey perhaps it could be larger and incorporate more energy systems and then there could be just one per building.
Ok, so there is no need for it to be a monkey but it does share some characteristics! Perhaps the form could be more futuristic.
Or maybe there should be just one pod in the centre of Canary Wharf that connects to all the others taking their waste and giving back electricity….
….Unfortunately it would have to be pretty big to be able to support all the towers in Canary Wharf.