Wind Energy, Hydro Power & Emerging Geothermal-Tidal Energy in India GK Questions & Answers
India's non-solar renewable power expansion represents a central component of its commitments under the Paris Agreement Nationally Determined Contributions (NDCs), aiming for 500 gigawatts of non-fossil electricity capacity by 2030. In the wind power sector, India ranks fourth globally in total installed capacity, spearheaded by coastal and arid states including Gujarat, Tamil Nadu, and Rajasthan. Major operational installations include the Muppandal Wind Farm in Tamil Nadu—one of the world's largest operational onshore wind complexes—and the Jaisalmer Wind Park, with technical potential monitored by the National Institute of Wind Energy (NIWE) in Chennai. In hydroelectric generation, the sector is institutionally divided: Small Hydro Power (plants with capacities up to 25 megawatts) is administered by the Ministry of New and Renewable Energy (MNRE), while large-scale projects are managed under the Ministry of Power and state utilities, coordinated by NHPC Limited. Beyond conventional renewables, exploration of geothermal resources is advancing in the high-enthalpy geothermal fields of Puga Valley in Ladakh and Manikaran in Himachal Pradesh, alongside oceanic tidal energy potential identified in the Gulf of Khambhat and Gulf of Kutch.
High-yield conceptual summaries for competitive exams and rapid revision.
India ranks fourth globally in installed wind power capacity, driven by extensive wind installations in Gujarat, Tamil Nadu, and Rajasthan.
The Muppandal Wind Farm in Tamil Nadu represents one of the largest onshore wind energy complexes in the world.
Hydroelectric projects in India are classified into Small Hydro (capacities up to 25 MW under MNRE) and Large Hydro (under Ministry of Power).
Puga Valley in Ladakh and Manikaran in Himachal Pradesh represent India's primary high-temperature geothermal exploration zones.
The Gulf of Khambhat and Gulf of Kutch in Gujarat provide the highest tidal energy potential on the Indian coastline.
Showing 25 Curated Questions417 Total in Bank
1ID: GK-ENRG-00016
easySolar, Wind & Green Hydrogen Missions
In fluid dynamics and wind energy engineering, what is Betz's theoretical maximum limit for kinetic energy extraction by any wind turbine rotor?
Verified Explanation
Formulated by German physicist Albert Betz in 1919, Betz's Law states that no wind turbine rotor can capture more than 16/27 (approximately 59.3%) of the kinetic energy contained in the oncoming wind.
2ID: GK-ENRG-00017
easySolar, Wind & Green Hydrogen Missions
Which autonomous institution under the Ministry of New and Renewable Energy (MNRE), located in Chennai, serves as the premier technical focal point for wind resource assessment in India?
Verified Explanation
The National Institute of Wind Energy (NIWE), situated in Chennai, Tamil Nadu, is the premier autonomous R&D institution under MNRE responsible for wind resource monitoring, offshore wind studies, and turbine testing/certification.
3ID: GK-ENRG-00021
mediumSolar, Wind & Green Hydrogen Missions
Under the National Wind-Solar Hybrid Policy issued by MNRE, what minimum rated capacity must the smaller resource have relative to the larger resource to qualify as a hybrid plant?
Verified Explanation
According to the National Wind-Solar Hybrid Policy, to be recognized as a hybrid power plant, the rated power capacity of one resource (wind or solar) must be at least 25% of the rated power capacity of the other resource.
4ID: GK-ENRG-00030
hardSolar, Wind & Green Hydrogen Missions
Which laser-based remote sensing technology is deployed on oceanographic platforms and towers to measure vertical wind speed and directional turbulence profiles up to 300 metres for offshore wind farm siting?
Verified Explanation
Doppler LiDAR (Light Detection and Ranging) systems emit pulsed laser beams and analyze Doppler shifts in light backscattered by atmospheric aerosols to accurately determine 3D wind velocity profiles at hub heights across proposed offshore wind zones.
5ID: GK-ENRG-00078
mediumSolar, Wind & Green Hydrogen Missions
According to the 'Strategy for Establishment of Offshore Wind Energy Projects' released by MNRE, what total offshore wind installation capacity has India targeted by 2030?
Verified Explanation
The Ministry of New and Renewable Energy (MNRE) outlined a strategic trajectory targeting 30 GW of offshore wind energy capacity by 2030. The initial phases focus on offshore seabed lease tenders off the coasts of Gujarat (Gulf of Khambhat) and Tamil Nadu (Gulf of Mannar), supported by viability gap funding.
6ID: GK-ENRG-00084
mediumSolar, Wind & Green Hydrogen Missions
In modern utility-scale wind turbines, what mechanism continuously rotates the individual rotor blades along their longitudinal axis to optimize aerodynamic lift and regulate power output?
Verified Explanation
The blade pitch control system uses active electric or hydraulic actuators to rotate each turbine blade about its longitudinal axis. This dynamically adjusts the blade's angle of attack to maximize aerodynamic lift across varying wind speeds and feather the blades to safely stop rotation during dangerous storm conditions.
7ID: GK-ENRG-00133
easySolar, Wind & Green Hydrogen Missions
Which premier autonomous research institute under the Ministry of New and Renewable Energy is located in Chennai and serves as the technical focal point for wind resource assessment in India?
Verified Explanation
The National Institute of Wind Energy (NIWE), formerly known as the Centre for Wind Energy Technology (C-WET), is an autonomous R&D institution situated at Velachery-Tambaram Main Road, Pallikaranai, Chennai. It conducts nationwide wind and solar resource assessments, turbine testing, and certification.
8ID: GK-ENRG-00140
mediumSolar, Wind & Green Hydrogen Missions
According to Betz's Law in wind turbine aerodynamics, what is the maximum theoretical efficiency (Betz limit) with which a wind turbine can extract kinetic energy from moving wind?
Verified Explanation
Formulated by German physicist Albert Betz in 1919, Betz's Law states that no wind turbine can capture more than 16/27 (approximately 59.3%) of the kinetic energy in wind. Modern commercial wind turbines typically operate at 35% to 45% aerodynamic efficiency.
9ID: GK-ENRG-00142
mediumSolar, Wind & Green Hydrogen Missions
Which two coastal Indian states have been identified by NIWE and MNRE as primary maritime zones for initial offshore wind energy seabed leasing auctions?
Verified Explanation
Resource assessments conducted by NIWE identified total offshore wind potential of ~70 GW off the coasts of Gujarat (Gulf of Khambhat) and Tamil Nadu (Gulf of Mannar). MNRE formulated the National Offshore Wind Energy Policy and tender models focusing primarily on these two maritime zones.
10ID: GK-ENRG-00150
hardSolar, Wind & Green Hydrogen Missions
In modern low-wind-speed regime wind turbine design (such as IEC Class III sites prevalent across interior India), what engineering strategy is adopted regarding 'specific power' (ratio of rated generator capacity to rotor swept area)?
Verified Explanation
For low and medium wind speed sites (IEC Class II and III) common across India, turbine manufacturers design low specific power machines (e.g., <200-250 W/m²). By deploying very long rotor blades with large swept areas relative to generator nameplate capacity, turbines capture more energy at lower wind velocities, yielding higher annual Capacity Utilization Factors (CUF).
11ID: GK-ENRG-00192
easySolar, Wind & Green Hydrogen Missions
In June 2024, the Union Cabinet approved a Viability Gap Funding (VGF) scheme with an outlay of ₹7,453 crore for the installation of how much total initial capacity of offshore wind energy projects?
Verified Explanation
In June 2024, the Union Cabinet chaired by the Prime Minister approved the Viability Gap Funding (VGF) scheme for offshore wind energy projects with a total outlay of ₹7,453 crore. The scheme supports the commissioning of 1 GW of offshore wind projects (500 MW off the coast of Gujarat and 500 MW off Tamil Nadu).
12ID: GK-ENRG-00200
mediumSolar, Wind & Green Hydrogen Missions
In offshore wind power engineering, which floating substructure relies on a ballasted, deep-draft cylindrical hull to achieve stability by placing the centre of gravity well below its centre of buoyancy in water depths greater than 100 metres?
Verified Explanation
A spar-buoy is a deep-draft floating offshore wind platform consisting of a long, vertical cylindrical ballast tank that extends deep below the water surface. Its stability is governed by gravity (heavy ballast at the bottom keeps the centre of gravity far below the centre of buoyancy), making it suitable for deep waters where fixed bottom turbines are impractical.
13ID: GK-ENRG-00206
hardSolar, Wind & Green Hydrogen Missions
In utility-scale wind farm micrositing and park layout optimization, what aerodynamic phenomenon describes the region of decelerated, highly turbulent airflow created downwind of an operating turbine rotor?
Verified Explanation
The wind turbine wake effect consists of a velocity deficit (reduced wind speed) and heightened turbulence intensity downstream of an active rotor due to kinetic energy extraction. Wind farm developers model this using analytical models (like the Jensen or Ainslie wake models) and space turbines 5 to 9 rotor diameters apart in the prevailing wind direction to minimize wake losses.
14ID: GK-ENRG-00254
hardSolar, Wind & Green Hydrogen Missions
Which autonomous institute under the Ministry of New and Renewable Energy is responsible for assessing offshore wind potential and deploying LiDAR buoys off the coasts of Gujarat and Tamil Nadu?
Verified Explanation
The National Institute of Wind Energy (NIWE), located in Chennai, is the nodal agency for assessing wind resources and facilitating offshore wind projects in India. NIWE has installed offshore Light Detection and Ranging (LiDAR) units in the Gulf of Khambhat and the Gulf of Mannar to gather high-precision wind data.
15ID: GK-ENRG-00259
hardSolar, Wind & Green Hydrogen Missions
What floating foundation concept for deepwater offshore wind turbines uses a ballasted slender vertical cylindrical column with a low center of gravity to achieve pitch and roll stability?
Verified Explanation
In deepwater offshore wind engineering (>60 meters depth where bottom-fixed monopiles are unfeasible), the spar-buoy foundation is a deeply submerged, ballasted cylindrical column with a center of gravity positioned far below its center of buoyancy. This design provides natural hydrostatic stability against extreme ocean waves and winds.
16ID: GK-ENRG-00261
mediumSolar, Wind & Green Hydrogen Missions
According to the National Wind-Solar Hybrid Policy of India, what minimum percentage of the rated capacity of one resource must the second resource contribute for a plant to be officially recognized as a hybrid project?
Verified Explanation
The National Wind-Solar Hybrid Policy issued by MNRE stipulates that to be recognized as a hybrid plant, the rated power capacity of one resource (wind or solar) must be at least 25% of the rated power capacity of the other resource. This requirement ensures meaningful technological and temporal complementarity.
17ID: GK-ENRG-00270
easySolar, Wind & Green Hydrogen Missions
According to the theoretical aerodynamic limit derived by Albert Betz, what is the maximum theoretical efficiency (Betz limit) with which a wind turbine rotor can extract kinetic energy from the wind?
Verified Explanation
The Betz limit, derived in 1919 by physicist Albert Betz, establishes that no wind turbine can capture more than 16/27 (approximately 59.26%) of the kinetic energy contained in wind. Modern commercial wind turbine rotors operate close to practical engineering limits, capturing 45% to 50% of wind energy.
18ID: GK-ENRG-00313
hardSolar, Wind & Green Hydrogen Initiatives
Which statutory authority is designated as the nodal agency for seabed leasing and allocation of offshore wind energy blocks within India's Exclusive Economic Zone?
Verified Explanation
The National Institute of Wind Energy (NIWE), Chennai, operates as the nodal agency under the Ministry of New and Renewable Energy for resource assessment, seabed surveys, and facilitating the allocation of offshore wind project zones along the coastlines of Gujarat and Tamil Nadu.
19ID: GK-ENRG-00318
hardSolar, Wind & Green Hydrogen Initiatives
According to Betz's Law in wind turbine fluid dynamics, what is the maximum theoretical aerodynamic efficiency with which a wind rotor can extract kinetic energy from the wind?
Verified Explanation
Formulated by German physicist Albert Betz in 1919, Betz's law dictates that no wind turbine can capture more than 16/27 (approximately 59.26%) of the kinetic energy in wind, regardless of rotor design.
20ID: GK-ENRG-00325
mediumSolar, Wind & Green Hydrogen Initiatives
What is the primary technical advantage of deploying Wind-Solar Hybrid (WSH) power plants over standalone solar or wind facilities?
Verified Explanation
Solar generates maximum power during daytime peak sunshine hours, while wind generation often peaks during late afternoon, evening, and night. Combining them provides a higher Capacity Utilization Factor (CUF) and reduces grid transmission congestion.
21ID: GK-ENRG-00377
easySolar, Wind & Green Hydrogen Initiatives
According to Betz's Law in aerodynamic theory, what is the maximum theoretical efficiency limit (Betz Limit) for extracting kinetic energy from wind?
Verified Explanation
Betz's Law, formulated by German physicist Albert Betz in 1919, establishes that no wind turbine can capture more than 16/27 (approximately 59.3%) of the kinetic energy in wind. Modern commercial wind turbines typically operate at 45% to 50% aerodynamic efficiency.
22ID: GK-ENRG-00385
hardSolar, Wind & Green Hydrogen Initiatives
What aerodynamic phenomenon causes wind turbines located downstream in a wind farm to experience reduced wind speed and elevated mechanical turbulence?
Verified Explanation
The wake effect occurs as an upstream wind turbine extracts kinetic energy from the airflow, creating a downstream plume of slower, highly turbulent air. Downstream turbines positioned within this wake suffer significant power generation deficits (wake losses) and heightened fatigue stress.
23ID: GK-ENRG-00388
hardSolar, Wind & Green Hydrogen Initiatives
Under the MNRE Policy for Repowering of Wind Power Projects (2023), what is the core mechanism to optimize India's wind energy potential?
Verified Explanation
MNRE's Wind Repowering Policy encourages developers to replace older, obsolete sub-megawatt wind turbines with modern, taller multi-megawatt turbines. This dramatically raises capacity utilization factors (CUF) and multiplies electricity output from India's most energetic wind resource sites.
24ID: GK-ENRG-00434
easySolar, Wind & Green Hydrogen Initiatives
According to Betz's Law, what is the maximum theoretical efficiency (Betz limit) for converting the kinetic energy of wind into mechanical energy by an ideal wind turbine rotor?
Verified Explanation
Betz's Law, formulated by German physicist Albert Betz in 1919, dictates that no wind turbine can capture more than 16/27 (approximately 59.3%) of the kinetic energy in wind. Modern commercial wind turbines typically achieve operational peak aerodynamic efficiencies of 40% to 50%, approaching close to the theoretical Betz limit.
25ID: GK-ENRG-00443
mediumSolar, Wind & Green Hydrogen Initiatives
In utility-scale wind farm layout planning, what term describes the downstream zone of reduced wind velocity and elevated turbulence created behind an operating wind turbine rotor?
Verified Explanation
The wake effect refers to the region of velocity deficit and increased mechanical turbulence behind an operating wind turbine rotor resulting from kinetic energy extraction. Wind farm micro-siting models space wind turbines 5 to 9 rotor diameters apart in prevailing wind directions to minimize wake-induced generation losses on downstream turbines.
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