first, start tracking your expenditures. This includes all spending. I have often found that while you can certainly do things to help cut costs on electris, gas, hydo the biggest gains and savings can come from things that are really discretionary spending.
Once you have built some data, you can attack the top 20% hitters and see the ones that are really discretionary. As a few others mentioned, start planning your meals and stop going out. Now this can be a lifestyle thing, but if you are serious about it, you will see areas to be able to make headway. Put some ideas to each category you track and see if you can make the changes. There are always options and always choices.
a few thoughts: Setback thermostats, a few less channels on the tele, dry clothes on a rack, consolidate car trips, public transportation (if an option), car pooling, changes in eating habits, AVOID FEES like bank and Credit Card interest, turn off uneeded lights or unplug things not needed, get rid of your petro guzzler, go to the library as opposed to buying the books, yadda yadda yadda….
It all starts by looking at your expenditures