Net Zero in 2007?

Our goal has been to use net zero electricity. Did we achieve this goal? Using a starting date of 12/11/2006 and ending date of 12/11/2007, we used 2638 kwh and produced 2177 kwh for a difference of 461 kwh used. We did NOT net zero, but we have only had the PV array up since May 18, so it should be achievable in 2008 with full year of production.