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The increasing damage and rapid depletion of traditional energy sources compel the worldwide population to achieve the necessary transition toward RES. It is vital that RES are included in the energy mix, especially, with an average growing rate of 1.8% energy consumption per year [1]. Existing electric power systems rely on fuel and coal to generate energy. The escalating permeation of RES aims to satisfy the expected global energy demand increase and the global energy demand to a large extant in order to meet the world's energy demand growth [2].

As a result of some environmental issues, a number of related organizations have engaged in research to increase efficiency and green power plants using developed technology. Concerns regarding environmental protection are rising, RES is therefore sought and examined. Fossil fuel and renewable energy costs, social and environmental prices are going in different directions and the economic and policy plans required to aid the extensive spreading of sustainable markets for renewable energy systems are developing quickly. Future growth in the energy sector will mainly be in the new regime of renewables. Hence, the transition to renewable energy can support us in meeting the challenges of decreasing greenhouse gas emissions, hindering future extreme weather and climate effects, and maintaining a reliable, timely, and cost‐efficient delivery of energy. The integration of renewable energy may result in substantial dividends for the future of energy security.

Renewables, with nuclear and hydroelectric power, deliver 50% of the extra energy needed out to 2035. Furthermore, renewable energy is the fastest growing source of energy as a result of decreasing capital costs coupled with rising penetration and due to the present state and federal policies investing in its employment, with its share in the primary energy rising to 10% by 2035, up from 3% in 2015. In addition, renewables account for 40% of the increase in power generation, making their share of global power rise from 7% in 2015 to approximately 20% by 2035 [3, 4].

RES is helped by nature and produce energy straight from the sun (thermal, photo‐chemical, and photo‐electric), indirectly from the sun (wind, hydropower, and biomass), or from other natural phenomena of the environment (geothermal and tidal energy). Renewable energy does not include energy resources originating from fossil fuels, waste products from fossil sources, or waste products from inorganic sources [5]. Renewable resources are gained from solar energy, wind, falling water, the heat of the earth (geothermal), plant materials (biomass), waves, ocean currents, temperature differences in the oceans and the energy of the tides. Renewable energy technologies turn these natural energy sources into practical forms of energy – usually electricity, heat, chemicals, or mechanical energy. Figure 2.1 illustrates an outline of renewables utilized across the globe and Figure 2.2 illustrates the theoretical potential of the RES which are able to provide over 3000 times the current energy consumption around the world [6]. In 24 hours, the sunlight that reaches the earth generates sufficient energy to meet the present energy requirements for 8 years [7–9].

The renewable energy markets – electricity, heating and transportation – have been rising over the previous five years. The integration of well‐known technologies, for example, hydro and additional advanced technologies including wind and solar photovoltaic, has increased rapidly, which gave confidence in the technologies, decreased prices and increased new opportunities [10]. Currently, renewable energy delivers approximately 18.3% of the final energy consumption, 50% of this percentage consists of advanced renewables, equally divided between electricity and direct heat applications, and the other 50% involves traditional biomass utilized for heating and cooking. The percentage of renewable energy in the total final energy will merely increase by 2030 from 18.3 to 21% [11]. Renewable energy generating capacity experienced its greatest annual rise ever in 2016, with approximately 161 Gigawatts (GW) of capacity added making the total global capacity almost 2017 GW, as illustrated in Figure 2.3. Furthermore, in 2019, renewables were responsible for approximately 7% of net additions to global power generating capacity [12].

Figure 2.1 Flowchart of the common renewable energy sources.

Figure 2.2 Renewable energy resources theoretical potential.

Figure 2.3 Total renewable power installed capacity (GW), including its annual growth rate, 2000–2019. Adapted from [12].

This chapter summarizes the benefits, growth, investment and deployment. Furthermore, challenges of integrating them into the electricity grid will be addressed. The content of this chapter is an updated and extension of earlier authors' publication [9].