Renewable Energy
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49 free Renewable Energy trivia questions with answers — technology quiz, new questions added Aug 2026.
23 free renewable energy trivia questions with answers. Put your renewable energy knowledge to the test with our comprehensive trivia quiz. Whether you're passionate about solar power, wind energy, or sustainable solutions, this quiz will challenge your understanding of green technology. Discover how much you know about the future of clean energy.
30 of 49 questions with answers and explanations. Play the quiz
Q 01Which physical effect lets a solar cell turn sunlight directly into an electric current, with no moving parts?
Photovoltaic effect
The photovoltaic effect is a semiconductor producing an electric current when light hits it, which is why solar cells are also called PV cells.
Q 02Which country held the largest installed wind power capacity globally at the end of 2024?
China
By the end of 2024, China significantly led the world in wind energy, with an installed capacity exceeding 520 GW, far surpassing other nations.
Q 03Which type of hydroelectric power plant stores water in a large artificial lake behind a dam?
Impoundment
An impoundment plant dams a river to store water in a reservoir; a penstock carries it down to the turbine, and the height difference, the head, sets the power output.
Q 04Which geothermal plant technology uses a low-boiling secondary fluid to turn a turbine?
Binary cycle
Binary cycle geothermal plants operate by using the heat from geothermal fluid to vaporize a separate working fluid with a lower boiling point, whose vapor then drives a turbine to produce electricity.
Q 05What biological process breaks down organic matter in the absence of oxygen to produce biogas?
Anaerobic digestion
Anaerobic digestion is microbes breaking down organic matter without oxygen; the biogas it yields is mostly methane and carbon dioxide and can be burned or upgraded to pipeline-quality biomethane.
Q 06What is the primary natural force responsible for creating tides, which are harnessed for tidal energy?
Gravity of the Moon and Sun
The gravity of the Moon and Sun pulls on the oceans to raise tides; at new and full moon the two pulls line up, producing the largest spring tides roughly twice a month.
Q 07What solar technology uses mirrors to focus sunlight on a receiver, heating fluid to make steam for a turbine?
Concentrated Solar Power (CSP)
Concentrated Solar Power (CSP) systems use mirrors to concentrate sunlight, generating high temperatures that heat a fluid to produce steam, which then powers a turbine to create electricity.
Q 08What is a key advantage of offshore wind farms compared to onshore wind farms?
Stronger, steadier winds
With no obstacles at sea, winds are stronger and steadier, giving a higher capacity factor. Offshore breezes are also often strong in the afternoon, when demand peaks.
Q 09Which of these is a documented environmental impact of building a large dam and reservoir?
Blocked fish migration routes
Blocked fish migration routes are a classic dam impact: salmon and other migratory fish cannot pass the wall without ladders. Dams also trap sediment that would otherwise build deltas downstream.
Q 10Enhanced Geothermal Systems extract heat from rock that conventional plants cannot use because it lacks what?
Natural water and permeability
Hot dry rock lacks the natural water and permeability a conventional plant needs, so Enhanced Geothermal Systems pump high-pressure water down an injection well to shear open cracks and create an artificial reservoir.
Q 11Which of these is a common feedstock used in the production of bioethanol?
Corn
Corn is the main bioethanol feedstock in the United States: its starch is broken into sugars, fermented into ethanol and blended into gasoline, most commonly as E10.
Q 12What billing mechanism credits solar-panel owners for excess power sent back to the grid?
Net metering
Net metering is an electricity billing mechanism that credits owners of renewable energy systems, such as solar panels, for the surplus electricity they feed back into the public utility grid.
Q 13What hydrogen production method uses renewable electricity to split water with zero emissions?
Electrolysis
Q 21Second-generation biofuels are primarily derived from which category of feedstocks?
Non-food biomass and crop residues
Second-generation biofuels come from non-food biomass and crop residues such as straw, corn stover and woody energy crops grown on marginal land, avoiding the food-security worries of diverting food crops into fuel.
Q 22What name is given to an electricity network that uses two-way digital communication to integrate renewables and respond to faults?
Smart grid
A smart grid moves information as well as electricity in both directions, letting it fold in distributed renewables and respond to faults faster than the one-way 20th-century grid.
Q 23Solar and wind are called 'intermittent' renewables because, unlike hydro, they are not what?
Green hydrogen is produced through electrolysis, a process that uses electricity from renewable sources like solar or wind power to split water into hydrogen and oxygen without generating greenhouse gas emissions.
Q 14Which type of silicon solar panel is known for its high efficiency and a uniform, dark appearance?
Monocrystalline
Monocrystalline panels get their uniform dark look because each cell is cut from a single high-purity silicon crystal, which is also what gives them their high efficiency.
Q 15What component atop a wind turbine tower houses the gearbox, generator and control systems?
Nacelle
The nacelle is the housing atop the tower that holds the gearbox, generator and control systems; the word is borrowed from aviation, where it means an engine pod.
Q 16Which of these is a direct use of geothermal heat, without converting it to electricity?
Heating greenhouses
Heating greenhouses is a direct use: geothermal water at only 25–90 °C warms the soil and air, far below what a power plant needs. Iceland grows tomatoes and cucumbers this way.
Q 17What chemical process is most commonly used to produce biodiesel from vegetable oils or animal fats?
Transesterification
Biodiesel is primarily produced through transesterification, a chemical reaction where vegetable oils or animal fats react with an alcohol in the presence of a catalyst to form fatty acid methyl esters (biodiesel) and glycerol.
Q 18Which technology stores energy by pumping water uphill and releasing it through turbines at peak demand?
Pumped-storage hydro
In 2021 pumped-storage schemes provided almost 85% of the world's 190 GW of grid energy storage.
Q 19When a company buys a carbon offset to cover its own greenhouse gas emissions, what is it paying for?
Funding reductions elsewhere
Funding reductions elsewhere only works if the world ends up at least as well off as if the buyer had cut its own footprint; programs issue their own credit labels, such as the CDM's Certified Emission Reductions.
Q 20Which type of hydroelectric plant diverts part of a waterway's flow through a penstock with little or no storage?
Run-of-river
A run-of-river plant diverts part of the river's flow through a penstock with little or no storage; any small pond it keeps is called pondage, so output follows the river's natural flow.
Dispatchable on demand
Solar and wind are not dispatchable on demand: their output follows the weather rather than the operator, unlike reservoir hydro, which can be ramped when needed. Storage and interconnection are the usual fixes.
Q 24In which country did James Blyth build the first electricity-generating wind turbine in 1887?
Scotland
Blyth's 10-metre cloth-sailed turbine charged batteries at his holiday cottage in Marykirk, Kincardineshire, Scotland, in July 1887, months before Charles Brush's machine in Ohio.
Q 25Under the Betz limit, what is the most of the wind's kinetic energy a turbine can capture?
About 59%
Albert Betz showed in 1919 that no turbine can capture more than 16/27, about 59%, of the wind's kinetic energy; the best modern rotors reach roughly 75–80% of that ceiling.
Q 26Who built the first solar cell, in the 1880s?
Charles Fritts
Charles Fritts coated selenium with a thin layer of gold in 1883 to make the first solar cell, about 1% efficient; Edmond Becquerel had only observed the photovoltaic effect in 1839.
Q 27In which Italian town did Prince Piero Ginori Conti test the first geothermal generator in 1904?
Larderello
At Larderello in Tuscany in 1904, Conti's generator lit four light bulbs; the world's first commercial geothermal power station was built there in 1911.
Q 28Which Californian geothermal field hosts the largest group of geothermal power plants in the world?
The Geysers
The Geysers, north of San Francisco, is the world's largest complex of geothermal plants: more than a dozen units with about 1.5 GW of installed capacity, running on dry steam since 1960.
Q 29Which dam overtook Hoover Dam in 1942 as the world's largest hydroelectric station?
Grand Coulee
Grand Coulee on the Columbia River passed Hoover in 1942 and was later expanded to 6,809 MW; hydropower was nicknamed 'white coal' in that era, and Itaipu took the title in 1984.
Q 30The low-head Kaplan hydro turbine is named after an engineer from which country?
Austria
Austria: Viktor Kaplan, an Austrian engineer teaching in Brno, patented his adjustable-blade propeller turbine in 1913; its design lets low-head, high-flow hydro plants run efficiently.