Well, let us assume for the sake of this discussion that God exists and is omnipotent.

The simple answer is still yes but to go into more detail:

God can kill himself and yet live again. God can make the impossible, possible. He can even make the possible, IMPOSSIBLE if that is his desire!!!!!

Let us look at what God has done:

(in the Sega Genesis chapter of the bible)
(1:11-13)
"Let the earth bring forth grass"
Plants are made on the third day before there was a sun to drive their photosynthetic processes (1:14-19). Notice, though, that God lets "the earth bring forth" the plants, rather than creating them directly.

So as we can see here God brings plants into existence yet there is no sun yet so either he himself was the light or plants germinated and sprung to life without a single bit of light! amazing!