solar energy
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Arch Rao, the former head of product at Tesla who was behind the company’s Powerwall home energy storage is system, is back with a new company pitching energy management and efficiency for homes.
Span is looking to upgrade the electrical fuse box for homes with a digital system that integrates into the existing circuit breaker technology that has been the basis for home energy management for at least a century.
Rao and his team are looking to make integrating renewable power, energy storage and electric vehicles easier for homeowners by redesigning the electrical panel for modern energy needs.
“We packaged the metering controls and compute between the bus bar and the breaker,” says Rao. “Energy flows through the panel through a breaker bar and the breaker bar has tabs that you slot your breakers into… that tab is usually a conductor. We have designed a digital sub-assembly that packages current metering, voltage measurement and the ability to turn each circuit on or off.”
The technology is meant to be sold through channels like solar energy installers or battery installers. The company already has plans to integrate its power management devices with energy storage systems like the ones available from LG .
Initially, Span expects to be selling its products in states like California and Hawaii where demand for solar installations is strong and homeowners have significant benefits available to them for installing renewable energy and energy efficiency systems.
For homeowners, the new power management system means that they have control over which parts of the home would be powered in the event of an outage. The company’s technology connects the entire home to a renewable system. Using existing technologies, installers have to set up a separate breaker and rewire certain areas of the home to receive the power generated by a renewable energy system, Rao says.
That control is handled through a consumer app available to download on mobile devices.
Span is backed by a slew of early investors, including Wireframe Ventures, Wells Fargo Strategic Capital, Ulu Ventures, Hardware Club, Energy Foundry, Congruent Ventures and 1/0 Capital, and intends to raise fresh cash before the end of the year. Rao said the round would be “in the low double digits” of millions.
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Walmart came out swinging earlier this week in a lawsuit that accused Tesla of breach of contract and gross negligence over problems with rooftop solar panel systems installed at the retail giant’s stores.
Now, just days later, the lawsuit has been placed on hold while the two companies try to reach an agreement that would keep the solar installations in place and put them back in service, according to a joint statement issued late Thursday night.
“Walmart and Tesla look forward to addressing all issues and re-energizing Tesla solar installations at Walmart stores, once all parties are certain that all concerns have been addressed,” the statement read. “Together, we look forward to pursuing our mutual goal of a sustainable energy future. Above all else, both companies want each and every system to operate reliably, efficiently, and safely.”
Walmart hasn’t dropped the lawsuit. The complaint is still on file with New York state court. But the two parties are going to try to reach an agreement that would avoid a lawsuit.
The lawsuit, which is aimed at Tesla’s energy unit that was formerly known as SolarCity, alleges that seven fires on Walmart rooftops were caused by the solar panel systems. Walmart asked Tesla to remove the solar panel systems on all 244 stores where they are currently installed and to pay for damages related to fires that the retailer alleges stem from the panels.
Now, a Walmart spokesperson said it is “actively working towards a resolution” with Tesla.
Neither Tesla or Walmart would explain the details of the negotiations.
The stakes are high for Tesla. Earlier this month, Tesla CEO Elon Musk announced a new rental offering for solar power in a bid to reboot the flagging renewable energy business.
Tesla’s share of the solar market has declined since its merger with SolarCity in 2016. In the second quarter Tesla deployed only 29 megawatts of new solar installations, while the number one and two providers of consumer solar, SunRun and Vivint Solar, installed 103 megawatts and 56 megawatts, respectively.
Tesla’s renewable energy business includes residential and commercial solar and energy storage products. The company also has a utility-scale energy product called Megapack. While Tesla still produces solar panels for residential use, much of its focus has been on developing its solar roof, which is comprised of tiles. It still operates a commercial business, which targets municipalities, schools, affordable housing, enterprise and agriculture and water districts as customers.
The company doesn’t provide a breakdown of its solar installations, making it difficult to determine if the commercial business is flat, falling or on the rise. Language in its latest 10-Q suggests Tesla is putting a renewed effort into its solar business.
Tesla said it’s working on revamping the customer service experience for solar products, according to the 10-Q. The company said while its retrofit solar system deployments have decreased it expects they “will stabilize and grow in the second half of the year.”
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Apple led the way in solar usage as technology companies step up their development of renewable energy projects to offset their carbon emissions.
That’s the word from the Solar Energy Industry Association in its latest tally of leading corporate solar energy installers across the U.S.
Last year, Apple installed 400 megawatts of solar capacity to lead all companies in the U.S.
“Top companies are increasingly investing in clean, reliable solar energy because it makes economic sense,” said Abigail Ross Hopper, president and CEO of the Solar Energy Industries Association (SEIA), in a statement. “[And] corporate solar investments will become even more significant as businesses use solar to fight climate change, create jobs and boost local economies.”

Four of the top 10 corporate solar users in the U.S. were tech companies. Amazon was No. 2 on the Solar Energy Industry Association’s list of companies tapping solar energy to power their businesses. The data center company Switch and search giant Google (a subsidiary of Alphabet) came in as the fifth and sixth companies.
“Playing a significant role in helping to reduce the sources of human-induced climate change is an important commitment for Amazon,” said Kara Hurst, director of Sustainability, Amazon, in a statement. “Major investments in renewable energy are a critical step toward addressing our carbon footprint globally. We will continue to invest in these projects and look forward to additional investments this year and beyond.”
The price for solar continues to come down, which is increasing the adoption — and scale — of solar installations in the U.S.

According to the SEIA, the biggest jump in solar installations have happened in the last three years. In all, 7 gigawatts of solar capacity has been installed at commercial locations, which is enough to power 1.4 million homes.
Of course, these numbers still need to increase even more dramatically for the corporate world to show that it’s serious about addressing climate change. While it’s important to acknowledge the successes of companies that are taking strides to incorporate more renewable energy into their operations, the goal for these massive industrial and technology giants (and really the goal for every institution) should be to get to as close to full decarbonization as possible.
The world has 10 years to wean itself off its current emissions-heavy consumption habits. Increasing solar usage is a step in the right direction, but it’s only a step.
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Toyota is testing a new and improved version of the solar power cells it previously launched on the Japan-exclusive Prius PHV, in a pilot along with partners Sharp and Japanese national research organization NEDO. This demo car’s prototype cells can convert solar energy at 34% and up, which is much better than the existing commercial version’s 22.5%. And, unlike its predecessor, it also can charge the car’s driving battery while the car is actually moving, recouping significant range while the vehicle is in use.
The new system will provide up to 44.5 km (27.7 miles) of additional range per day while parked and soaking up sun, and can add up to 56.3 km (35 miles) of power to both the driving system and the auxiliary power battery on board, which runs the AC, navigation and more.
Using a redesigned solar battery cell film that measures only 0.03 mm (that’s 0.001 inches), the vehicle’s engineers could put the film over a much broader surface area of the vehicle compared to the existing production version, with solar cells that wrap around covered body components, the rear door and the hood with relative ease. And as mentioned, the system can now work while the car is actually driving, thanks to changes in how generated power is fed to the system, which is a huge step up from the last generation, which could only push power to that auxiliary battery to run the radio, etc. when in motion.
This new test vehicle will hit the road in Japan in late July, and perform trials across a range of different regions to test its abilities in different weather and driving conditions. Ultimately, the goal is to use this research to facilitate the commercial deployment of more efficient solar power generation tech that can work in a number of transportation applications.
Solar-powered cars to date have been a bit of an outlier proposition: There’s Toyota’s own Prius PHV, but it’s quite limited in terms of what you gain versus a traditional plug-in electric. Lightyear One, a startup from The Netherlands, unveiled its own solar electric consumer car last month, but production on that vehicle isn’t set to start until 2021, and it’s a new entrant into the market, at that.
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Rivian, the once secretive company that made its public debut in November with an electric pickup truck and SUV, plans to give its batteries a second life and put them to work in a solar microgrid project in Puerto Rico.
The automaker is teaming up with The Honnold Foundation, an organization started by Alex Honnold, the professional climber and subject of the documentary Free Solo, on the microgrid project. Honnold and Rivian CEO RJ Scaringe will discuss the project Saturday in Denver. The discussion, which is scheduled for 6 pm MT, will be live-streamed.
The microgrid project will be set up in Adjuntas, a city of about 20,000 people in midwestern Puerto Rico that was severely impacted by Hurricane Maria in 2017. Casa Pueblo, an environmental watchdog based in Adjuntas that has been looking for ways to set up affordable sources of community power, is also a partner in the project.
Rivian is providing 135 kilowatt-hour battery packs from its development vehicles to support the microgrid. Earlier this year, battery engineers from Rivian and The Honnold Foundation visited Casa Pueblo and met with community leaders to design a site-specific system that will power many of the businesses located in the Adjuntas town square.
The downtown solar microgrid project will serve two purposes. It will give residents access to electricity for core business if the primary source of power is gone. The microgrid will also be used daily to offset the high cost of energy in Puerto Rico, which is twice the national average of the U.S.
The system is expected to launch in 2020.
“Second-life batteries are a big enabler to accelerating widespread adoption of renewable energy, and it’s exciting to envision this system contributing importantly to a community. This project allows us to model a customized energy storage solution that takes into account space constraints, disaster resiliency and energy independence,” Scaringe said.
The project marks the beginning of the company’s long-term plans to find a wide variety of applications for second-life batteries.
The company designed its pack, module and battery management system to transition from vehicle energy storage to stationary energy storage at the end of their vehicle life. The module itself is thin, a design that allows for second-life applications that are space-efficient and customizable.
Rivian is an electric automaker focused on adventure vehicles like pickup trucks and sport utility vehicles. The company announced in February that it had raised $700 million in a round led by Amazon.
The company has spent the first part of its life operating out of the public eye. It was originally launched as Mainstream Motors in 2009. By 2011, the name changed to Rivian and moved out of Florida. Today, the company has more than 1,000 employees split between development locations in Plymouth, Mich., San Jose and Irvine, Calif. and Surrey, England. It also has a 2.6 million-square-foot factory in Normal, Ill.
Rivian plans to launch the R1T electric pickup truck and the R1S SUV in the U.S. in late 2020, with introduction to other global geographies starting in 2021.
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Even as its solar business declined in step with its overall earnings, Tesla is bullish on the prospects for the energy side of its business over the course of the year.
The energy business is an unheralded part of Tesla — overshadowed by its headline-grabbing (and much larger) auto exploits — that chief executive Elon Musk thinks will generate an increasing share of revenue for the company over time.
Revenues from its solar power and energy storage business fell by 13 percent from the fourth quarter 2018 and 21 percent from a year ago period, down to $324.7 million from $371.5 million in the fourth quarter of 2018 and $410 million in the year ago quarter.
Solar energy deployments fell from 73 megawatts to 47 megawatts from the fourth to the first quarter, the company said. Those figures were offset by a slight increase in solar deployments.
The company actually introduced a new financing and purchasing model for solar installations in the second quarter — saying in its shareholder letter that residential solar customers can buy directly from the Tesla website, in standardized capacity increments.
“We aim to put customers in a position of cash generation after deployment with only a $99 deposit upfront. That way, there should be no reason for anyone not to have solar generation on their roof,” Musk and chief financial officer Zachary Kirkhorn wrote in the shareholder letter.
Tesla’s battery storage business was hit as the company shifted units from energy storage to installation in its own vehicles.
“Energy storage production in the second half of 2018 was limited by cell production as we routed all available Gigafactory 1 cell capacity to supply Model 3,” the company wrote in its letter. “Some Gigafactory 1 cell production has been routed back to the energy storage business, enabling us to increase production in Q1 by roughly 30% compared to the previous quarter.”
And Musk thinks that the energy business will grow significantly over the course of the year. “We hope that growth rate will continue and battery storage will become a bigger and bigger percentage over time,” Musk said on an analyst call following the earnings release. Potentially, Tesla thinks its energy business could grow by as much as 300 percent, Musk said.
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In the nine years since private equity and venture capital investments into sustainable technologies last crossed the $6 billion threshold, the problems caused by global carbon emissions have only intensified.
Now, as the world confronts the reality that there’s not much time left to reverse course on carbon emissions and the impact they will have on life on earth, both corporate and private investors are once again stepping up their commitments to startups in the space.
In 2018, global venture capital investment into startups focused on sustainability jumped 127 percent, to $9.2 billion, the highest since 2010, according to a January report from Bloomberg New Energy Finance. Powering that boost was a $1.1 billion investment in the smart window maker, View, and another $795 million for Chinese electric vehicle firm Youxia Motors. In fact, there were no fewer than eight VC/PE financings of Chinese EV specialist companies in 2018, totaling some $3.3 billion.
That stark assessment is coming from more corners of the scientific community, and the reality of the danger is being emphasized by politicians and concerned citizens around the globe.
The simple truth is that things are getting worse. And for the past two years, emissions have been increasing as countries continue to use oil and gas and coal to fuel economic growth, even as the global community realizes that carbon emissions are an increasing threat.
A recent assessment by the U.S. government put the cost of climate change caused by carbon emissions at $500 billion annually by the end of the century. And the financial toll doesn’t begin to assess the cost to the quality of human life and the potential lives that will be lost because of climate-related disasters.
This isn’t the first time the world has realized the threat climate change poses. It’s not even the second. Back in 1979 — and throughout the next decade — the U.S. grappled with how to craft an appropriate response to the coming climate-related crisis. Perhaps unsurprisingly, the government failed, and the issue of imminent climate disaster was set aside.
Former Vice President Al Gore picked up the thread in the mid-2000s in the wake of his defeat to the Connecticut Yankee turned Texas oilman George W. Bush in the contested 2000 presidential election. Through advocacy work and the popular climate-focused documentary “An Inconvenient Truth,” Gore was able to proselytize among a group of technocrats looking for the next big thing in the wake of the internet explosion that had transformed professional and personal lives.
Venture capital investors flocked to invest in renewable technologies — from biofuels to new solar energy generating technologies to new battery chemistries and beyond.
Over the next seven years billion-dollar companies would rise and fall on the back of speculative investment in the promise of a cleaner energy future that would disrupt the oil industry and turn billionaires into multi-billionaires — all while saving the world.
It didn’t work out.
Problems with scaling technologies beyond a controlled laboratory setting; global economic pressures wrought by an explosion of manufacturing capacity in countries like China; and the hubris of investors who thought that their investment acumen in picking winners of the information age could work just as well in centuries-old industries like oil and gas, or electricity, found themselves floundering in complicated, regulated markets with deep-pocketed incumbents and entrenched interests in promoting the status quo.
In the process, investors lost hundreds of millions of dollars in the U.S. alone, and destabilized some of the oldest firms in the investment industry.
Now, companies and investors are returning to the market in a major way. Some of the largest businesses in the food and agriculture industry are investing in new companies that are developing protein replacements and novel cultivation technologies; utilities are investing more heavily in smart grid technologies as electrification and microgrids become more real; automakers and battery manufacturers are backing new energy storage technologies; and frontier investors are backing companies tackling everything from biologically based chemical manufacturing to new construction technologies for smart homes and cities, to new kinds of nuclear power that could transform how the world conceives of energy abundance (along with geo-engineering tech to remove carbon from the atmosphere).
“In the last few years, the number of technologies ripe for investment has expanded dramatically,” Ravi Manghani, research director for energy storage at Wood Mackenzie, an energy research and consultancy firm, told CNBC in March. “It’s no longer just three or four technology verticals.”
While none of these technological advancements are a guaranteed solution to the threats carbon emissions pose, or are surefire commercially viable businesses, the fact that investors are once again looking at sustainability as a viable investment thesis — capable of producing multiple billion-dollar businesses — is a good step forward.
Any plan to address decarbonization has to confront industries as diverse as agriculture, construction, transportation, chemicals and consumer goods from clothes to chemicals.
Failure to confront these challenges would be catastrophic. Even if global warming is restricted to just the 2 degree Celsius target set at the Paris climate agreement, that could mean the extinction of the world’s tropical reefs and several meters of sea-level rise, as The New York Times reported last August. Already the impacts of climate change have meant tens of billions of dollars in damage for the U.S. in 2018 alone.
“The era of incrementalism on climate change is over,” said Massachusetts Senator Ed Markey, one of the architects of the “Green New Deal” legislation, in an interview with Vox. “We are now in the era of the Green New Deal. It’s not going away. It is creating an incentive for governors to do more, for mayors to do more, for companies to do more. The polling says it has political legs that will drive it right into the election of 2020, and when that cycle is done, I think we’re going to see a much greater capacity for us to take the kind of action that we need.”
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Across the globe, a clutch of companies from Oxford, England to Redwood City, Calif. are working to commercialize a new solar technology that could further boost the adoption of renewable energy generation.
Earlier this year, Oxford PV, a startup working in tandem with Oxford University, received $3 million from the U.K. government to develop the technology, which uses a new kind of material to make solar cells. Two days ago, in the U.S., a company called Swift Solar raised $7 million to bring the same technology to market, according to a filing with the Securities and Exchange Commission.
Called a perovskite cell, the new photovoltaic tech uses hybrid organic-inorganic lead or tin halide-based material as the light-harvesting active layer. It’s the first new technology to come along in years to offer the promise of better efficiency in the conversion of light to electric power at a lower cost than existing technologies.
“Perovskite has let us truly rethink what we can do with the silicon-based solar panels we see on roofs today,” said Sam Stranks, the lead scientific advisor and one of the co-founders of Swift Solar, in a Ted Talk. “Another aspect that really excites me: how cheaply these can be made. These thin crystalline films are made by mixing two inexpensive readily abundant salts to make an ink that can be deposited in many different ways… This means that perovskite solar panels could cost less than half of their silicon counterparts.”
First incorporated into solar cells by Japanese researchers in 2009, the perovskite solar cells suffered from low efficiencies and lacked stability to be broadly used in manufacturing. But over the past nine years researchers have steadily improved both the stability of the compounds used and the efficiency that these solar cells generate.
Oxford PV, in the U.K., is now working on developing solar cells that could achieve conversion efficiencies of 37 percent — much higher than existing polycrystalline photovoltaic or thin-film solar cells.
New chemistries for solar cell manufacturing have been touted in the past, but cost has been an obstacle to commercial rollout, given how cheaply solar panels became thanks in part to a massive push from the Chinese government to increase manufacturing capacity.
Many of those manufacturers eventually folded, but the survivors managed to maintain their dominant position in the industry by reducing the need for buyers to look to newer technologies for cost or efficiency savings.
There’s a risk that this new technology also faces, but the promise of radical improvements in efficiencies at costs that are low enough to attract buyers have investors once again putting money behind alternative solar chemistries.
Oxford PV has already set a world-leading efficiency mark for perovskite-based cells at 27.3 percent. That’s already 4 percent higher than the leading monocrystalline silicon panels available today.
“Today, commercial-sized perovskite-on-silicon tandem solar cells are in production at our pilot line and we are optimizing equipment and processes in preparation for commercial deployment,” said Oxford PV’s CTO Chris Case in a statement.
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The simplest needs are often the most vital: power and clean water will get you a long way. But in rural areas of developing countries they can both be hard to come by. OffGridBox is attempting to provide both, sustainably and profitably, while meeting humanitarian and ecological goals at the same time. The company just raised $1.6 million to pursue its lofty agenda.
The idea is fairly simple, though naturally rather difficult to engineer: Use solar power to provide to a small community both electricity (in the form of charged batteries) and potable water. It’s not easy, and it’s not autonomous — but that’s by design.
I met two of the OffGridBox crew, founder and CEO Emiliano Cecchini and U.S. director Troy Billett, much earlier this year at CES in Las Vegas, where they were being honored by Not Impossible, alongside the brilliant BecDot braille learning toy. The team had a lot of irons in the fire, but now are ready to announce their seed round and progress in deploying what could be a life-saving innovation.
They’ve installed 38 boxes so far, some at their own expense and others with the help of backers. Each is about the size of a small shed — a section of a shipping container, with a scaffold on top to attach the solar cells. Inside are the necessary components for storing electricity and distributing it to dozens of rechargeable batteries and lights at a time, plus a water reservoir and purifier.
Water from a nearby unsafe natural (or municipal, really) source is trucked or piped in and replenishes the reservoir. The solar cells run the purifier, providing clean water for cheap — around a third of what a family would normally pay, by the team’s estimate — and potentially with a much shorter trek. Simultaneously, charged batteries and lights are rented out at similarly low rates to people otherwise without electricity. Each box can generate as much as 12 kWh per day, which is split between the two tasks.
The alternatives for these communities would generally be small dedicated solar installations, the upfront cost of which can be unrealistic for them. The average household spend for electricity, Billett told me, is around 43 cents per day; OffGridBox will be offering it for less than half that, about 18 cents.
It doesn’t run itself: The box is administrated by a local merchant, who handles payments and communication with OffGridBox itself. Young women are targeted for this role, as they are more likely to be long-term residents of the area and members of the community. The box acts as a small business for them, essentially drawing money out of the air.
OffGridBox works with local nonprofits to find likely candidates; the women pictured above were recommended by Women for Women. They in turn will support others who, for example, deliver or resell the water or run side businesses that rely on the electricity provided. There’s even an associated local bottled water brand now — “Amaziyateke,” named after a big leaf that collects rainwater, but in Rwanda is also slang for a beautiful woman.
Some boxes are being set up to offer Wi-Fi as well via a cellular or satellite connection, which has its own obvious benefits. And recently people have been asking for the ability to play music at home, so the company started including portable speakers. This was unexpected, but an easy demand to meet, said Billett — “It is critical to listen!”
The company does do some work to keep the tech running efficiently and safely, remotely monitoring for problems and scheduling maintenance calls. So these things aren’t just set down and forgotten. That said, they can and have run for hundreds of thousands of hours — years — without major work being done.
Each box costs about $15,000 to build, plus roughly another $10,000 to deliver and install. The business model has an investor or investors cover this initial cost, then receive a share of the revenue for the life of the box. At capacity usage this might take around two years, after which the revenue split shifts (from a negotiable initial split to 50/50); it’s a small, safe source of income for years to come. At around $10,000 of revenue per year per box with full utilization, the IRR is estimated at 15 percent.
What OffGridBox believes is that this model is better than any other for quick deployment of these boxes. Grants are an option, of course, and they can also be brought in for disaster relief purposes. Originally the idea was to sell these to rich folks who wanted to live off the grid or have a more self-sufficient mountain cabin, but this is definitely better — for a lot of reasons. (You could probably still get one for yourself if you really wanted.)
OffGridBox has been through the Techstars accelerator as part of a 2017 group, and worked through 2018, as I mentioned earlier, to secure funding from a variety of sources. This seed round totaling $1.6 million was led by the Doen and Good Energies Foundations; the Banque Populaire du Rwanda is also a partner.
Along with a series A planned for 2019, this money will support the deployment of a total of 42 box installations in Rwandan communities.
“This will help us become a major player in the energy and water markets in Rwanda while empowering women entrepreneurs, fighting biocontamination for improved health, and introducing lighting in rural homes,” said Cecchini in the press release announcing the funding.
Alternative or complementary sources of power, such as wind, are being looked into, and desalination of water (as opposed to just sterilization) is being actively researched. This would increase the range and reliability of the boxes, naturally, and make island communities much more realistic.
Those 42 boxes are just the beginning: The company hopes to deploy as many as 1,000 throughout Rwanda, and even then that would only reach a fifth of the country’s off-grid market. By partnering with local energy concerns and banks, OffGridBox hopes to deploy as many as 100 boxes a year, potentially bringing water and power to as many as 100,000 more people.
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Because solar and wind power are now cheaper to produce than energy from fossil fuels, the only obstacle that remains to the mass adoption of renewable power is the amount of money utilities need to spend to store the energy those systems produce.
Right now, storing 100 megawatts of renewable energy (enough to power roughly 600,000 homes) means spending roughly $65.6 million on massive batteries like the kind made by Tesla, or relying on huge pumped hydro-electric storage projects that essentially create man-made dams where the release of water spins turbines to generate energy (those projects are typically far larger than 100 megawatts).
A new company called Energy Vault, launched from Bill Gross’ Idealab incubator in Pasadena, Calif., has developed a technology, based on the principles of pumped hydro storage, that it claims can slash the cost of energy storage to a fraction of the current price and make renewable energy cost-effective all day, every day.
As climate change worries mount, finding a solution that can make renewables even more compelling and cost-effective isn’t just a good business — it’s a global priority. 
Energy Vault’s technology consists of a 33-story-high, six-armed crane with booms extending to nearly the length of a football field (about 87 yards). That crane is surrounded by 5,000 huge concrete blocks weighing roughly 35 metric tons altogether (or around 172,000 pounds).
“These would typically be built out near wind farms or solar plants,” said Robert Piconi, the chief executive of Energy Vault. “This is not something that you’d drop in the middle of the city.”
The cranes are controlled by a software system that manages the movement of the cement blocks to either store the energy generated by solar or wind farms, or discharge that energy onto the power grid.
According to Piconi, each of the company’s systems will have 35 megawatt hours of nominal energy capacity and 4 megawatts of peak power capacity. Ramp times occur in as little as a millisecond with 100 percent power achieved in 2.9 seconds.
The systems have roundtrip efficiencies of roughly 90 percent and there’s no energy loss, as the technology relies on mechanical energy from incredibly durable materials that have a roughly 30-year lifetime.
And all of this at a price tag of around $7 million to $8 million per system, according to Piconi. What makes the system even more sustainable, according to Piconi, is the use of recycled concrete that was only going to be landfilled — instead of new cement construction.
Energy Vault has already set up a demonstration system in Biasca, Switzerland, next to the company’s Lugarno headquarters. That demonstration plant likely had a role in the company’s ability to sign up a clutch of initial customers, including The Tata Power Company Limited, India’s largest integrated power company, to deploy an initial 35 MWh Energy Vault system by 2019.
“Innovation in energy storage represents the largest and most near-term opportunity to accelerate renewable deployments and bring us closer to replacing fossil fuels as the primary source to meet the world’s continual growth in energy demand,” said Bill Gross, co-founder, Energy Vault and founder of Idealab. “We’re excited to support Energy Vault in bringing this groundbreaking technology to the market.”
Indeed, over the next two years, Energy Vault expects customers to build between 500 megawatts and one gigawatt of storage capacity using its systems, according to Piconi.
“We have customers on every continent to build these units,” he said.
Piconi, a former Danaher executive, met Gross 12 years ago as the Idealab founder was beginning his push into renewable energy technologies. The two men stayed in touch and began seriously contemplating the creation of Energy Vault after nearly a decade of collaboration and contact.
It was back in 2017 that Piconi, Gross and fellow co-founder and chief technical officer Andrea Pedretti hit upon the idea for Energy Vault’s novel approach to energy storage.
“It became clear to him a few years ago how important storage was going to be,” said Piconi.
The three men started looking at the efficiencies available through pumped hydroelectric storage, and began brainstorming ways to mimic that process using mechanical energy. “We looked at a steel tower first, but that was too expensive. We thought about water in a tower pumped up, but there were efficiency issues there,” Piconi said. “Then we got to the concrete bricks and the crane.”
The concrete was important for the cost of materials, and because of the energy intensity and pollution that’s involved with manufacturing cement, the team decided to use recycled cement to make the blocks that its energy storage system would use.
Enter, Cemex, one of the largest cement manufacturers in the world, which has joined with Energy Vault as a partner.
Energy Vault has already raised capital through several “seed” rounds to develop its technology and get the prototype in Switzerland up and running.
“Energy Vault’s team has developed a disruptive platform, and we are enthusiastic to work with their team to deploy an environmentally efficient and cost-effective energy storage solution that is highly viable,” said Dr. Davide Zampini, head of Cemex Global R&D and IP. “We share a common commitment to enable a future where resources are used responsibly, which is paramount to Cemex’s strategy for sustainable development.”
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