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CellBioGuy comments on The Octopus, the Dolphin and Us: a Great Filter tale - Less Wrong
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You still have to get rid of waste heat, you can't recycle it because of the second law of thermodynamics. So they'd radiate highly in the infrared.
Incidentally, there is an object in the Triangulum galaxy that's dim in the visible and near-infrared but the most luminous thing in that galaxy in the mid-infrared.
It's also extremely bright in total luminosity across the spectrum (including infrared) - 100,000x as bright as the Sun. Other similar objects have been seen as supernova sources in other galaxies, suggesting they are massive stars shrouded in self-produced dust which blocks visible light but lets IR through. If this is the case, various models suggest we should see the dust around this thing clear in decades to centuries - or a supernova. You can bet people are watching it closely though...