Renewable energy resources are natural resources that replenish themselves within time limits that permit sustained use, in contrast to nonrenewable resources. That is, resources can be replenished by natural process at least as fast as they are used. Therefore it can be used over and over again. Five types of renewable resources are: Wind Power, Hydropower, Solar Energy, Geothermal Energy, Biomass Fuel and Wood.

Solar energy is the energy from the sun ( in the form of heat and light) that is directly capture and converted into thermal or electrical energy and harnessed as solar power. Solar power is the technology of obtaining (harnessing) usable energy from the light of the sun. Some applications of solar energy are hot water heating and space heating in the home. It is also used in the application of solar panels where individual homes (in region where it is warm and sunny) convert solar energy into thermal energy to generate electricity.

The use of solar energy displaces conventional energy where it results in a proportional decrease in green house gas emissions. The energy from the sun is free with just the initial cost to set up the technology. The sun provides unlimited (renewable) supply of solar energy. The only draw back is that its requires a large area to collect the sun's radiation and requires some means of storage.

Wind power is the conversion of wind energy into electricity using wind turbines (usually mounted on a tower). Wind power is used in large scale wind farms for national electrical grids. On a small scale it is also used to provide electricity to rural residences. Wind energy is ample, free, widely available, clean, renewable, produces no waste or greenhouse gases, need no fuel, good method of supplying energy to remote areas and can be a site for tourist attraction.

Hydropower is the capture of the energy of moving water (falling of water from one level to another) for some useful purpose. This falling of water can be natural falling source or from a dam. The falling water is used to turn waterwheels or modern turbine blades which is used to powering a generator to produce electricity. Hydropower system is a clean source of energy systems that can neither be polluted or consumed during its operation. It eliminates the cost of fuel, making it immune to price increases for fossil fuels. As long there is a water source (lake, river etc.) it is renewable.