Try using programmable thermostats to save energy inside your home. These let you adjust the times when you can turn on your heater or air-conditioning according to the schedule you set up. As a result, you're not operating anything as much when you're not home, or when you're asleep.
Invest in a tankless water heater. Rather than a standard water heater, which is working 24 hours a day, a tankless water heater provides hot water only when you need it. This will save you about $100 to $200 per year, up to 50% less than the cost of running a standard water heater.
A Canadian company has designed a water turbine which can harvest energy in slow moving water. “Waterotor” can work in currents as slow as 2 mph which …
Use rechargeable batteries. While they might cost a little bit more initially, they will save you a lot of money in the long run. Rechargeable batteries can be used hundreds of times, and they only need to be replaced about every five years. Another benefit is that you aren't constantly adding corrosive batteries to the landfill.
If specific areas of your home feel cold or drafty, then chances are they are not properly sealed or insulated. These deficiencies can greatly increase the cost of heating or cooling your home and are often an easy fix. Seal any holes you identify and get a price estimate for adding insulation to thin walls.