Today we use about 600 exajoules of primary energy per year. The sun hits us with about 3.8 million exajoules per year. 1.03^1000 is a factor of 7e12. So under that assumption, the earth would be making 1 billion times more power than we receive from the sun.

I can pretty much guarantee that we won't be scaling at 3%/yr for the next 1000 years. And if we do, that's an argument for lots more nuclear fission, and a lot of fusion too. Because the solar-derived flows (wind, solar, hydro, biofuel, fossil fuel) won't be able to keep up even if we covered 100% of the earth with solar panels!