How We Solved The Home Wind Turbine Problem

Whenever I cover wind turbines, many of you ask about what's available for home applications. At the moment, I've got both good news and bad news. The bad news is that the current market for residential wind is ... less than great. The good news? We have a lot of new innovations that look to improve it. The team behind the US-based startup Harmony Turbines is hoping to popularize wind energy for the masses and allow them to have their iPhone moment. Plus, if you remember our video on Aeromine's rooftop models from last year, we have an update on how its motionless design is progressing out in the real world. But of course these are far and away from the only companies working on bringing wind power generation to our backyards. I mean, residential wind has to have its moment someday, but when? Or should I say, but when? I'm Matt Ferrell ... welcome to Undecided. This video is brought to you by Surfshark, but more on that later. I have solar power on my home, but it's obviously only producing significant amounts of electricity on sunnier days. Being able to augment that with wind power is incredibly appealing. That's one of the reasons why companies like Aeromine and Harmony Turbines have been catching my eye, but I'll get to them in a minute. Chances are that if you're interested in renewable energy, you already know that residential wind is nowhere near the commonality and accessibility of residential solar. At least for now. But why? Well, I've previously discussed that practicality, or more accurately, the lack of it, of home wind generation in depth. But for those who aren't up to speed, here's a quick recap. First of all, just like with any kind of home renewable energy generation, wind requires installation space. However, what makes it different from solar is the amount of space needed. While solar allows for somebody to make use of the roof that they already have, wind is generally much more demanding. This isn't only a function of the height needed to make the best use of winds found far off the ground, but the distance needed to keep turbines away from obstacles that cause turbulence. Otherwise, you risk not only undercutting energy production, but reducing the lifespan of the turbine. So with those factors in mind, the U.S. Office of Energy Efficiency and Renewable Energy recommends that you should have at least one acre of land for the proper placement of a wind turbine. For an idea of just how much that is, keep in mind that the average square footage of a U.S. single-family home is around 2,200 square feet on less than a tenth of an acre of land. However, it's worth noting that about 19% of the U.S. population lives in rural areas, and this typically goes hand-in-hand with having enough room to support wind turbine systems. Sorry city slickers, that's not to say that urban areas are completely out of luck forever though. There are other companies like Owind and Alpha 311 that are focusing on integrating wind turbines directly into existing city infrastructure. I can dive into these companies in future videos if you're interested, just let me know in the comments. And that brings us right to the next barrier to wind energy. It might seem obvious at first, but to take advantage of wind power on your home turf, you need, well, wind. If your local weather doesn't promote strong and consistent gusts that keep those blades turning, then wind simply isn't worth your time. And not all wind is the kind you want. So what separates good wind from bad? What are acceptable wind speed ranges and where can you find them? It depends heavily on where you live. In a 2022 study on distributed wind setups conducted by the U.S. government's National Renewable Energy Laboratory, its authors identified California, Minnesota, and the Northeast region of areas of interest. These places tick all three of the boxes that allow for profitability, enough wind supply, high retail electricity prices, and favorable political policies. On a state-by-state basis, New York, Minnesota, Kentucky, Texas, Oklahoma, and South Dakota stand out for holding the largest economic potential for residential zones. The researchers also spotlight my own personal stomping grounds, the region of New England, as a solid contender because of its particularly pricey electricity. It's very expensive here. When it comes to capturing wind energy in residential, suburban, or urban settings, you're talking about wind speeds at roughly 10 meters or about 30 feet above the surface level in most cases. And if you look at this map from NREL on those average wind speeds, you'll notice one major trend. Most places have a speed of 3-5 meters per second or about 6-12 miles per hour. That's not nearly fast enough for wind energy to be cost effective ... yet. However, a bunch of companies are trying to address that shortcoming by creating cheaper, more effective turbine designs that can make the most out of what little wind resources are available. That slower, more chaotic wind is usually a big problem ... for traditional horizontal wind turbines at least. But not so for Savonius Turbines, which is a type of vertical axis wind turbine that historically hasn't fared too well as a mass market option. However, this is where creative engineering can truly shine. I spoke to Chris and Cheryl Moore from Harmony Turbines, which is a small startup developing a really interesting Savonius Turbine about that exact point. Generally, wind in the rural and even urban areas is not very good. So it's dirty wind, it's disrupted wind. And Savonius Turbines are the king of low wind speed power production. Now, it's not magic. This isn't like zero point energy or, you know, getting more out of a system than you're putting in. It's not magic. It does need wind to make power. But if the majority of the United States and the world at large doesn't have good wind, shouldn't we try and make a wind turbine that can at least capitalize on that, you know, poor wind condition? That brings me straight into possible solutions for the more residential market. There are multiple companies, like Harmony Turbines, trying to tap into the niche with a cheaper, smarter approach. Before we get into that though, there's also a smarter approach to protecting yourself from online tracking and targeting, and maybe even saving some money. And that's today's sponsor, Surfshark. 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Surfshark offers a 30-day money-back guarantee, so there's no risk to try it out for yourself. I've been using Surfshark for years and I absolutely love it. Link in the description below and thanks to Surfshark and to all of you for supporting the channel. So back to the wind turbine companies trying to innovate in the more residential side of the market. As I mentioned before, Harmony Turbines designs a type of wind turbine, which was invented by Sigurd Johannes Savonius in 1922. They typically consist of two or more half-cylindrical blades that are mounted on a vertical shaft in an S-shape. If you've seen an anemometer, which measures wind speeds, it works in the same basic way. They're designed to spin even at low wind speeds and regardless of the wind direction. The turbine captures wind energy through a simple mechanism known as differential drag. As wind interacts with the concave and convex sides of the blades, the difference in drag force causes the rotor to spin. That differential drag allows it to operate effectively in turbulent wind. While it's known for its simplicity and ease of construction, the Savonius turbine typically has a lower efficiency, which is often reported to be around 15% compared to traditional propeller designs at around 50-60%. Best disputed by Chris Moore, the CEO of Harmony Turbines. If you really dig into it and look, you're going to see the Savonius turbine is like the lowest crappiest out of all of them, out of like 10 or 12 pictures. And then you'll see one that suddenly it's like up in the 30 and you're like, well, wait, what's that one? Same graph, just the arrows are reversed. Yeah. So the bad data, because the internet is just a copy and paste society, it was just making it a thousand times worse and just putting all this bad data out there. In working with the universities, Penn State especially, like the professor slapped her hands down on the table. She goes, yes, yes, yes. I've been trying to teach this for the past five years in my classes, that the data is wrong. So they were excited to work with us on this project because they wanted to help debunk this bad data. What sets their approach apart from a typical Savonius design is that the scoops can articulate to control the spin. So the way we approach that problem is we have our furling mechanism where our scoops or fins or whatever you want to call them at a certain RPM or when the turbine reaches its max RPM, they'll close in towards each other a little bit. And the purpose of this is twofold. One, it'll control the spin so we're not spinning out of control. But the second thing that that does is it allows us to continue generating power. Even though we have strong winds, even though we're partially closed, we're still generating power. The other ones, they stop. When wind speeds exceed a turbine's rated spin speed, they have to shut off to protect themselves or they'll literally tear themselves apart. Harmony's approach allows it to close itself off a little bit to slow the rotation, but not stop. The idea is to allow the device to keep going even under the kind of wild conditions that would typically grind production to a halt. The ability to reduce the exposure area and slow the rotational speed gives them some advantages over their larger horizontal wind access turbine cousins. But then there's Aeromine, which I covered in a previous video. I'll link that in the description if you want a deeper dive. But in a nutshell, they're using airfoils to concentrate and amplify the wind. The purpose of an airfoil is to make physics work for you and take advantage of the Bernoulli effect. This refers to how gases and liquids flow around an object at different speeds. Just like an airplane wing, air moves faster over the top section of the wing than the bottom, creating lift. Looking at their turbine from the exterior, there's no exposed moving parts. Instead, two vertically mounted, hollow foils stand opposite each other with a space between them. This creates a low pressure zone, and as wind flows through this space, a short pipe then leads the captured wind to a fully enclosed turbine located at ground level. The fact that Aeromine's approach is to place their devices along the front edge of a building's flat roof isn't by accident. Have you ever walked between tall buildings and felt like you were walking into a wind tunnel? I used to work in the center of Boston, and it sometimes felt like I was a meteorologist trying to stand upright in a hurricane-force wind while talking about the ongoing storm. That wind tunnel effect is caused by the wind slamming into the surface of the building and getting compressed and funneled around it. It amplifies the speed of the wind, and Aeromine is capitalizing on that effect. One of the things that's powerful about Aeromine is we're leveraging two fluid streams. What happens is the free wind hits the face of the building. It creates an amplification that goes into our generator, and at the same time, as the free wind hits the airfoils, that creates a pressure which pulls the wind up. So instead of fighting the environment that it's on, it's using the building structure itself to help. Precisely. So we're leveraging the inherent aerodynamics of the building and those flow streams to effectively amplify the wind resources. Basically, Aeromine is taking what would normally be a negative to a traditional horizontal wind turbine and making it an advantage. They've also been busy since I talked about them last time and have some interesting updates, which I'll get to in just a minute. But if one or more of these companies is successful at driving down the cost per watt of small wind turbines for more residential and suburban settings, there's a huge market that they can tap into. The traditional thinking in the wind industry, which is totally valid, is bigger is better because the bigger the swept area, the more power you create, which makes all the sense in the world. It's a law of physics. But at the same time, it creates a limited market to some level as far as applications. There's a lot of kind of behind-the-meter opportunity by leveraging these large rooftops to create power. You're not as beholden to transmission requirements and you can get the power to where it's needed. It's virtually an untapped market right now. So it's not like 90% of residential areas already have wind turbines. And so then you're trying to convince them to get rid of that and get a new one. You know, people are looking for them. People are waiting for the right solution to come out. And so we hope that we are the ones that fill that gap. People are looking for it. You know, they're just kind of waiting because they don't know what to do. And David said something very similar. If you think about on-site generation, what are folks really trying to achieve? They're trying to maximize their on-site generation. And so I think that's what really resonates with folks that we talk to every day all around the world is that this technology allows an operator or owner of a building where suitable to create incremental generation, which can really move the needle and be quite meaningful. If a homeowner or building owner crunches the numbers and sees a path to maximizing their energy generation and savings by layering in wind turbines along with solar, small-scale distributed wind generation could finally see, well, it's day in the sun. This is where it gets interesting though. Since I last covered Aeromind, there's been some updates on what they're doing. The company has had a pilot project running on top of a BASF building for about a year and a half now with great results. And it's planning to expand in 2024. We have a series of approximately 10 pilot projects that are actually in production right now and are starting to roll out in the next two quarters. So you'll see a lot more Aerominds on the rooftops in both the US and Europe in the next six months. And then we are in kind of the final stages of what we call design for manufacturing of our mass market product, which should be introduced late in 2024. Meanwhile, Harmony Turbines is collaborating with two universities in the company's home state of Pennsylvania. It just finished a study that involved receiving feedback from Bucknell University, and it also has additional work being done with Penn State University. Harmony is also making a splash across the pond at Northumbria University in the UK. Bucknell's study helped the Harmony team to do full-scale testing of its current design, and Penn State has been doing water tank testing for the clustering effects. That's basically determining how to group turbines together to maximize production. In horizontal-axis wind turbines, that usually means having to space them far apart, as the wake created by the turbines upwind can dramatically impact those behind it. What's interesting is that for vertical-axis wind turbines, that's not the case. In fact, studies are showing that grouping them closer together can actually amplify their production. Again, this is about turning a disadvantage of dirty, chaotic wind into a positive. Chris and Cheryl spoke to me at length about how they're continuing to iterate their scoop design, and will be starting to gather a lot of data this year. And like I said, they've got a really interesting approach that I'm keen to see play out, but they're in their very early days right now. One thing I love about Harmony Turbines as a company is how they're sharing their journey of development out in the open. Most companies do not do this. They have a website and YouTube channel with videos they're publishing on a regular basis, so if you'd like to see what it takes to develop a technology like this, and why it usually takes more time than you might think, it's awesome stuff. And let me know if you'd like to do a deeper dive on their approach or any other companies in this area. Now, while smaller-scale wind technology still isn't here for homes just yet, there's a lot of interesting developments in the works. It doesn't seem like we'll have to wait much longer to find out which way the wind is blowing. But what do you think about the future of residential wind? Jump into the comments and let me know. And be sure to my follow-up podcast, Still To Be Determined, where I'll be discussing some of your feedback. 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