Well, if we wanted to really get in to the details, the Earth is releasing more energy than it receives from the sun simply because it is also cooling. The core grows by about a few mm a year because of this, IIRC.

With a brief, 60 million year time frame exception during the Carboniferous, though, the energy stored in life processes is a wash. Assembly and decay are a net balance, and life itself is a strong driver of entropy, so I wouldn't be surprised at all if, on the whole, the biosphere is a net energy sink.