Renewable energy is the energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat.
These renewable energy resources such as wind and solar energy are constantly replenished and will never run out. Some of the forms of renewable energy sources are mentioned here.

Solar :

  It is the most free renewable energy source which we get either directly or indirectly from the sun i.e. Sunlight or solar energy. It can be used directly for heating, for generating electricity, for lighting homes, buildings, for water heating, solar cooling and for a variety of commercial and industrial uses. Solar Energy is an essential source of Renewable Energy & its technologies convert sunlight into electrical energy either through photovoltaic panels or concentrated solar power. This energy can be used to generate electricity or be stored in batteries or thermal storage.

Main Types of Solar Energy?

• Solar Photovoltaic Plants. Solar photovoltaic systems are the most common type of solar energy system that produces electricity directly from sunlight.
• Concentrated Solar.
• Solar Water Heating Systems.
• Technical Passive Solar Heating.

Advantages of Solar Energy

• Renewable Energy Source. Among all the benefits of solar panels, the most important thing is that solar energy is a truly renewable energy source.
• Diverse Applications.
• Reduces Electricity Bills.

• Technology Development.

• Low Maintenance Costs.

With a modern solar energy system, including power storage, one can definitely run a whole house completely on solar power. Today’s high-efficiency solar panels and solar batteries make it cheaper than ever before to power an entire home exclusively using solar energy. In India, monthly power consumption of an average household is 250 kWh. Therefor an average Indian house needs approximately 2.3 kW of solar system which is 7 solar panels each of 330 watts.

Wind :

The second free source from nature is wind. The sun’s heat drives the winds and this energy is captured with wind turbines which in turn used to create electricity. The Earth’s rotation also contributes to the flow of winds.

Biomass :

The rain (water) and sunlight causes plants to grow. The organic matter which makes up those plants is known as biomass. This Biomass can be used to produce electricity, transportation, fuels or chemicals.

Geothermal :

Not all renewable energy resources come from the sun. Geothermal energy taps the Earth’s internal heat for a variety of uses, including electric power production and the heating and cooling of buildings.

Hydrogen :

Hydrogen can be found in many organic compounds, as well as water. It’s the most abundant element on the Earth. Because energy is always needed to produce hydrogen, it is not an energy source, but a way to store and transport energy, so it is referred to as an energy carrier.

Oceans :

The ocean can produce thermal energy from the sun’s heat and this mechanical energy from the tides and waves can be converted into electrical energy.

Hydropower :

The energy produced from flowing water can be turned into electricity. This is called hydroelectric power or hydropower.

Biogas :

It can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste.  It can also be used in a gas engine to convert the energy in the gas into electricity and heat.
Biogas typically refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. It is a clean unpolluted and cheap source of energy in rural areas. It consists of 55-70% methane which is inflammable.

Gobar gas:

Gobar gas is produced from cattle dung in a bio gas plant commonly known as Gobar gas plant through a process called digestion.