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Introduction to energy sources
Power resources

Energy resources or power resources are the primary input in the production of goods and services. The wheels of progress move with the flow of energy. They are one of the critical elements in raising the living standards of any country. Safe, affordable and reliable energy in sufficient quantities is a must for any developing country.

Energy in itself be classified into several types based on the following criteria

Primary and Secondary energy

Commercial and Non commercial energy

Renewable and Non-Renewable energy

Conventional and Non-conventional energy

The two major types of energy resources are:

1. Non-renewable energy resources, and

2. Renewable energy resources

The energy resources, which cannot be easily replenished, are known as non-renewable energy resources.

Some common examples are: Coal, Petroleum, and Natural Gas

The energy resources, which can be renewed or replenished, are known as renewable energy resources.

Some common examples are: Hydroelectricity Solar Energy Wind Energy Tidal Energy, and Geothermal Energy

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A renewable resource is a natural resource which replenishes to overcome resource depletion caused by usage and consumption. Renewable energy is obtained from sources that are essentially inexhaustible
TYPES OF RENEWABLE RESOURCES

1.Solar

2.Wind power

3.Hydroelectric energy

4.Biomass

5.Hydrogen and fuel cells

6.Geothermal power

7.others like oceans,etc

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Being a tropical country, India is lucky to receive abundant sunlight. Solar energy can be used for cooking, water-heating, space-heating, etc. Solar power is one of the most popular and fast-growing, sources of alternative energy. Solar voltaic cells convert solar energy into electricity without any pollution. The process involves solar cells that rely on the photovoltaic effect to absorb photons and convert them into electrons. Photovoltaic power was only used for small to medium-sized operations, ranging from solar powered devices to house-hold arrays. Since 1980s, solar power plants have become more common. They are a relatively inexpensive source of energy where grid power is inconvenient and too expensive.
The earth’s sun makes more energy in one second thantheamount six billion nuclear power plants would produce in a year. The sun is lso ultimately the source of all energy supplies,except for  nuclear and geothermal energy.

·         Does not cause pollution

·         Environment friendly

·         Log lifetime

·         High initial investment

Cumulative photovoltaic capacity increased by more than 75GW, by 2016, and reached atleast 303 GW, sufficient to supply 1.8% of the world’s total electricity consumption. The top installers of 2016-2017 were China, the United States and India. The largest plant is found in China.

In 2009 July, India unveiled a US$19bn plan to install 20GW of solar power capacity by 2020. India’s installed PV generation has been expanding at a very rapid pace in recent yrs, with the total capacity increasing from 10MW in 2010 to over 16,200MW as of September 2017. Gujarat solar parks (605MW) and charanka solar park (214GW) are the large scale producers.

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Solar collectors capture and concentrate sunlight to heat a synthetic oil called therminol, which then heats water to create steam. The steam is piped to an onsite turbine-generator to produce electricity, which is then transmitted over power lines. On cloudy days, the plant has a supplementary natural gas boiler. The plant can burn natural gas to heat the water, creating steam to generate electricity.

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Solar collectors capture and concentrate sunlight to heat a synthetic oil called therminol, which then heats water to create steam. The steam is piped to an onsite turbine-generator to produce electricity, which is then transmitted over power lines. On cloudy days, the plant has a supplementary natural gas boiler. The plant can burn natural gas to heat the water, creating steam to generate electricity.

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https://www.nexteraenergyresources.com/what/solar_works.shtml