I only looked at electricity.
Last billing cycle I used a little below 2400 kWh in a year. Now with a second child it will increase a bit, but I think that I have only a few options left.
Power prices in here a higher that in the US.
I pay EUR 6,95 (USD 9,20) as a base price and EUR 0,189 (USD 0,25) per kWh. the power company announced an increase to EUR 0,212 (USD 0,28) per kWh as per January 1st, so I am shopping for a new supplier.
I live in a 80 sqm flat with three rooms plus kitchen and bathroom.
Main consumers are:
my server ( ~ 40 W = 350 kWh)
fridge (12 years old, back then A grade power efficiency)
washing machine (6 month old, A grade power efficiency)
dishwasher (1,5 yeras old, A grade power efficiency)
almost nothing on standby, all systems equipped with real switches in the power cord, CFL lightning.
I could optimize the server or shut it down entirely, but investments in this area are not cost efficient. When the fridge dies or in 5 years, I will replace it with an even more efficient system.
When the price for LED lights gets lower they are an option too.
We are looking into building a house and it will be highly optimized, so we should not have to spend more on total power (electricity & heating) than we do now.
So I believe that there should be massive potential for savings in your situation