[HPsquared]

That's a pretty small amount of power. 0.01 Wh if run for a year. For reference a CR2032 button cell has 67 times as much energy.

[MochaDen]

I think the algae is great but this also shows how very, very little power you need for small embedded devices these days. You could probably run this CPU off of almost anything. Moldy old pop tart? Go for it!