can you compute my energy consumption?

I have a core 2 quad q9300 @2.50ghz, team extreme 1066 2gb of ram. power color 3870 ati 256 bit 512mb video card. Gigabyte ep45-dq6 motherboard. 1 500gb and 1 1Tb saegate Hard drive. 1 optical drive. my power supply is 500w huntkey and its all working fine. now Im planning to buy a Thermaltake Level 10 GT which comes with free Toughpower 1200W. I just want to know since its a 1200w power supply would it cost more energy than before when i only got a 500w power supply? Thank you in advance!!