Covering every roof with solar could supply 2/3 of global electricity – study
If the world covered every suitable roof with solar panels, it could supply 2/3 of humanity’s total electricity consumption – allowing the globe to transition completely off of fossil electricity generation, according to a new study out of the University of Sussex.
The study examined satellite data to determine the total suitable roof area around the planet which could be used for rooftop solar panels. It took into account roof slope, shading from other buildings, and so on.
It found that rooftop solar could provide a total of 19,483TWh of electricity, which is about 2/3 of global electricity use (which was 29,664TWh in 2023).
This total is actually more than the amount of electricity the world currently generates from fossil fuels – that number was 17,718TWh in 2024, driven mostly by coal and methane, two highly polluting sources.
Thus, if all of the world’s roofs were covered with solar panels, all of current fossil fuel electricity generation could be eliminated, taking a big chunk out of the unhealthy pollution created by human activities.
Certain regions are seen as more ripe for deployment of solar panels, like East Asia which has a large percentage of the world’s building stock (due to the region’s high population), and Africa where despite low housing stock, solar penetration is currently very low and solar capacity is high.
In total, the study says that this move alone could reduce global temperatures by 0.13C. While that number doesn’t seem too large, it’s a big chunk of the 1.5C warming “budget” that scientists have determined the world has to work with – and every bit of movement past that number risks additional cascading effects that will make the world less livable for humans and other species, and cause more catastrophic effects like we’re already seeing as a result of the fossil fuel industry’s operations around the globe.
The study does include a caveat that as world temperatures continue to rise, this could make certain types of solar panels less effective, leading to a drop in total generation capacity. Thus, the more we confront climate change now, the more effective this tactic will be.
However, this effect is also balanced by the potential of solar panels to be deployed more effectively by optimizing tilt angles. The study’s base case assumes flat horizontal installations – but if optimal tilt angles or solar tracking was used, the panels could be up to 39% more effective. This means if the world covered every roof with sun-tracking panels, it couldn’t just cover 2/3 of electricity production, but all of it.
It also doesn’t cover the potential of large grid-tied solar projects, just rooftops. If we used certain desert land for solar plants (which could regenerate desertified locales), that only adds to the world’s solar potential.
But we have only compared these numbers to current electricity use. The world does use energy for lots of other things – and one of the largest chunks of this is oil for transportation. As global transportation shifts rapidly to electrification, this will mean electricity use will go up significantly (though total energy use for transportation will go down – since EVs are much more efficient than gas cars).
So while rooftop solar may be enough for our current electricity needs in an ideal situation where every rooftop is covered, there will still be other sources needed to cover the rest of the shifting landscape of electricity use. Ideally, those sources will be clean – which shouldn’t be hard, given that renewables are cheaper than fossil generation.
Further, solar is less suitable in some areas than others, and for certain tasks (such as the obvious nighttime electricity use), so electricity storage (either provided by EVs, home battery systems, or grid storage) or other low-carbon generation methods like wind, hydro or nuclear still have a place, particularly in instances when they have cost advantages.
Electrek’s Take
Among some governments’ efforts to make energy more expensive and harmful to your health, it’s nice to have some good news sometimes.
This study provides that news, showing that the roofs above our heads, which currently provide no active benefit (beyond the passive benefits of heat retention, shelter from elements and so on), could be leveraged without having to build any additional structures or use any additional land, and could cover a huge portion of our current energy use.
It’s something that has been estimated by advocates many times before, but now we have a study showing just how effective rooftop solar can be.
Not to mention that it can help you save money on your energy bills, while you contribute to solving the biggest problem humanity has ever had to confront (and hey, lookie here, Electrek even has a handy affiliate link to help you find out how much money you can save… isn’t that nice!)
If you’re considering going solar, it’s always a good idea to get quotes from a few installers. To make sure you find a trusted, reliable solar installer near you that offers competitive pricing, check out EnergySage, a free service that makes it easy for you to go solar. It has hundreds of pre-vetted solar installers competing for your business, ensuring you get high-quality solutions and save 20-30% compared to going it alone. Plus, it’s free to use, and you won’t get sales calls until you select an installer and share your phone number with them.
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Sustainable construction experts McKinstry have teamed up with leading BESS developers Viridi and the Denver Public Library to deploy a first-of-its-kind solar and battery storage system that sets a new standard for fire safety.
The Denver Public Library sought a battery energy storage system (BESS) that could deliver cost savings without compromising safety for staff, visitors, or the architecturally significant, Michael Graves–designed structure itself. That required a battery backup solution that not only met the city’s fire safety standards, but also addressed public fears about the risk of lithium-ion battery fires.
That unique set of project priorities led the library to Viridi, makers of the RPSLinkEX battery solution that’s equipped with a unique, “passive Fail-Safe thermal management and anti-propagation technology” designed to prevent the sort of thermal runaway that leads to li-ion battery fires.
“Public facilities like the Denver Public Library are at the forefront of demonstrating that energy resilience and safety can go hand in hand,” said Jon M. Williams, CEO at Viridi. “This installation highlights how fail-safe battery storage can empower communities to maximize renewable energy, reduce costs, and maintain reliability – all without compromise.”
Keeping it safe
Viridi doesn’t talk too much about how its passive Fail-Safe thermal management system works, but if you’re picturing heat-dissipating layers, fire-resistant insulation, and strategically-placed phase change materials (or PCMs) limiting the transfer of heat from one cell to another if it begins to overheat, you’ve probably cracked it.
These passive safety features enable safer deployment scenarios in occupied buildings or near critical infrastructure by reducing dependence on active fire suppression systems like sprinklers or fire extinguishers, and convinced the City of Denver to move forward with the project, which is the city’s first-ever solar + battery storage system.
“The entire McKinstry team is very excited about developing and constructing the first Solar + BESS project for the City and County of Denver,” said Jon Ensley, Sr. Construction Project Engineer at McKinstry. “We are appreciative of all our partners and stakeholders who helped to achieve this goal. We value Viridi’s expertise in deploying this technology and the whole team has been great to work with.”
McKinstry says this latest solar project sets, “a new benchmark for how cities can combine renewable energy and battery storage without compromising safety.” And, with solutions like the RPSLinkEX building systems that meet city planners and politicians where they are, instead of trying to educated them about the objective, proven safety of li-ion batteries, Viridi is helping communities adopt cleaner, more resilient clean energy solutions sooner rather than later.
READ MORE
SOURCE | IMAGES: Viridi, via PV Magazine; Michael Graves.
If you’re considering going solar, it’s always a good idea to get quotes from a few installers. To make sure you find a trusted, reliable solar installer near you that offers competitive pricing, check out EnergySage, a free service that makes it easy for you to go solar. It has hundreds of pre-vetted solar installers competing for your business, ensuring you get high-quality solutions and save 20-30% compared to going it alone. Plus, it’s free to use, and you won’t get sales calls until you select an installer and share your phone number with them.
Your personalized solar quotes are easy to compare online and you’ll get access to unbiased Energy Advisors to help you every step of the way. Get started here.
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China’s Dongfang Electric has installed a 26-megawatt offshore wind turbine, snatching the title of world’s most powerful from Siemens Gamesa’s 21.5 turbine in Denmark.
The Chinese state-owned manufacturer announced today that it has installed the world’s most powerful wind turbine prototype at a testing and certification base. This turbine, the world’s largest for capacity and size, boasts a blade wheel diameter of more than 310 meters (1,107 feet) and a hub height of 185 meters (607 feet). Dongfang shipped the turbine’s nacelle earlier this month – the world’s heaviest – along with three blades.
This offshore wind turbine is designed for areas with wind speeds of 8 meters per second and above. With average winds of 10 meters per second, just one of these giants can generate 100 GWh of power annually, which is enough to power 55,000 homes. That’s enough to cut standard coal consumption by 30,000 tons and reduce CO2 emissions by 80,000 tons. Dongfang says it’s wind resistant up to 17 (200 km/h) on the extended Beaufort scale.
In May, Dongfang said it had completed static load testing on the turbine’s blades, and the turbine is now undergoing fatigue testing, which could take up to a year before the turbine is fully certified.
Read more: Trump just killed all offshore wind zones as US power needs surge
The 30% federal solar tax credit is ending this year. If you’ve ever considered going solar, now’s the time to act. To make sure you find a trusted, reliable solar installer near you that offers competitive pricing, check out EnergySage, a free service that makes it easy for you to go solar. It has hundreds of pre-vetted solar installers competing for your business, ensuring you get high-quality solutions and save 20-30% compared to going it alone. Plus, it’s free to use, and you won’t get sales calls until you select an installer and share your phone number with them.
Your personalized solar quotes are easy to compare online and you’ll get access to unbiased Energy Advisors to help you every step of the way. Get started here.
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The autonomous ag equipment experts behind the GUSS robotic sprayers have been developing their AI tech as part of a JV with John Deere for years — and now, that marriage is official. John Deere has acquired 100% of GUSS, and has big plans to pick up that tech and run with it like a … well, you know.
The latest battery-powered GUSS autonomous sprayer made its debut at the 2024 World Ag Expo show in Tulare, California, last summer, where executives from Deere called it, “the world’s first and only fully electric autonomous herbicide orchard sprayer.”
Since then, interest in automated ag equipment has only grown — fueled not just by rising demand for affordable food and produce, but by a national labor shortage made worse by the Trump Administration’s tough anti-immigration policies as well. It’s specifically those challenges around labor availability, input costs, and crop protection that GUSS and John Deere have been spending millions to address.
“Fully integrating GUSS into the John Deere portfolio is a continuation of our dedication to serving high-value crop customers with advanced, scalable technologies to help them do more with less,” explains Julien Le Vely, director, Production Systems, High Value & Small Acre Crops, at John Deere. “GUSS brings a proven solution to a fast-growing segment of agriculture, and its team has a deep understanding of customer needs in orchards and vineyards. We’re excited to have them fully part of the John Deere team.”
About GUSS
The GUSS electric sprayer is powered by a Kreisel Battery Pack 63 (KBP63), which has a nominal energy capacity of 63 kWh, enabling the machine to operate for 10-12 continuous hours between overnight (L2) charges.
The GUSS electric sprayers feature the Smart Apply weed detection system that measures chlorophyll in the various plants it encounters, identifying weeds embedded among the crops, and only sprays where weeds are detected. The company claims its weed detecting tech significantly reduces the amount of chemicals being sprayed onto farmers’ crops, resulting in “up to 90% savings” in sprayed material.
John Deere’s deep pockets will support GUSS as it continues to expand its global reach, and help the group to accelerate Smart Apply’s innovation and integration with other John Deere precision agriculture technologies.
“Joining John Deere enables us to tap into their unmatched innovative capabilities in precision agriculture technologies to bring our solutions to more growers around the world,” says Gary Thompson, GUSS’ COO. “Our team is passionate about helping high-value crop growers increase their efficiency and productivity in their operations, and together with John Deere, we will have the ability to have an even greater impact.”
GUSS-brand autonomous sprayers will be sold and serviced exclusively through John Deere dealers, and the GUSS business will retain its name, branding, employees, and independent manufacturing facility in Kingsburg, California.
More than 250 GUSS machines have been deployed globally, having sprayed more than 2.6 million acres over 500,000 autonomous hours of operation.
Electrek’s Take
Population growth, while slowing, is still very much a thing – and fewer and fewer people seem to be willing to do the work of growing the food that more and more people need to eat and live. This autonomous tech multiplies the efforts of the farmers that do show up for work every day, and the fact that it’s more sustainable from both a fuel perspective and a toxic chemical perspective makes GUSS a winner.
SOURCE I IMAGES: John Deere.
If you’re considering going solar, it’s always a good idea to get quotes from a few installers. To make sure you find a trusted, reliable solar installer near you that offers competitive pricing, check out EnergySage, a free service that makes it easy for you to go solar. It has hundreds of pre-vetted solar installers competing for your business, ensuring you get high-quality solutions and save 20-30% compared to going it alone. Plus, it’s free to use, and you won’t get sales calls until you select an installer and share your phone number with them.
Your personalized solar quotes are easy to compare online and you’ll get access to unbiased Energy Advisors to help you every step of the way. Get started here.
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