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What would such a being be capable of doing?
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Very little i would guess - at least in terms of things that me might be able to observe. Matter may be a condensed form of energy, but it is far more diverse in how it manifests and interacts with other forms of energy and matter. Energy itself is much more uniform, and less able to interact in as many ways. If this is the case, and intelligence is a function of complexity, then a being composed of energy would have to be stretched out over a much vaster area than one composed of matter in order to share the same order of complexity. The problem with this is that most energy patterns dissipate in an inversely proportionate manner so any inter-reacting energy sources are unlikely to have a strong enough effect on one-another to perform any form of useful feedback function. In addition, any new sources of energy would be highly disruptive to such a being and cause further functional problems.
The long and short of it is I don't think such a being could exist, and if it did, it would be a delicate whispy fog stretched out over the gulfs of space with very little capability of manipulating the physical world.
N.B. I've been a bit glib here in using the word complexity as if all that's needed for a functioning being is a complex enough bunch of interacting units - I'm not saying it's necessarily the *only* thing, but I do think it is most definately a pre-requisite.