As the lead sales and product specialist at a company that’s spent over a decade designing, manufacturing, and installing Stepless Variable Speed Drives (VSDs) for industrial, commercial, and even municipal clients, I get asked one question more than any other: “Are VSDs actually better for the environment?” It’s a fair question. For years, I’ve walked clients through the basics: a VSD adjusts the speed of an electric motor to match the exact load it’s handling, instead of forcing motors to run at full speed regardless of demand. But I also know that like any piece of technology, VSDs aren’t perfect. Over the years, I’ve dug through data, field-tested our products, and even heard pushback from engineers who worry about hidden environmental tradeoffs. Today, I want to break down the real environmental impacts of using a Stepless Variable Speed Drive, straight from the perspective of someone who sells these drives for a living—and stands behind what they deliver. Stepless Variable Speed Drive
Let’s start with the big, obvious win: energy savings. Electric motors account for roughly 45% of global electricity consumption, per the International Energy Agency (IEA), and in industries like water and wastewater, HVAC, and manufacturing, they account for even more. Take a water treatment plant, for example: the pumps used to move water through the facility don’t need to run at full speed 24/7. If a plant is treating 30% less water on a weekend, a traditional constant-speed motor will still spin at 100%, wasting energy. A VSD, though, will slow the pump to match the lower demand. I’ve had a municipal client in Ohio install our VSDs on their main water distribution pumps, and they reported a 38% drop in electricity use within the first year. That’s not just a nice number—less electricity means fewer fossil fuel-powered power plants firing up extra units to meet peak demand, lower greenhouse gas (GHG) emissions, and reduced strain on the grid.
Even for smaller applications, the savings add up. Take a commercial office building’s HVAC system. During off-hours, when no one’s in the building, the fans that circulate air don’t need to run at full blast. A VSD will adjust the fan speed based on temperature sensors or occupancy data, cutting energy use by 20-50% compared to constant-speed systems. For a mid-sized office building, that’s thousands of dollars in annual energy bills and a corresponding reduction in CO2 emissions—about 15 tons per year, from what I’ve seen with clients in the Southeast U.S.
But here’s the part most people don’t talk about: the environmental benefits don’t stop at energy. Lower energy use translates to less demand for fuel extraction and processing. Think about it: every ton of coal or barrel of oil that’s not burned to power a motor is material that stays in the ground, reducing habitat destruction from mining, oil spills, and pipeline leaks. I recently worked with a manufacturing plant in the automotive sector that switched to VSDs on their conveyor belts and material handling systems. They not only cut their annual electricity bill by $120,000 but also reduced their scope 2 emissions (emissions from purchased energy) by 210 tons a year. That’s the equivalent of taking 45 cars off the road annually, per EPA emissions data.
Another often-overlooked impact is reduced wear and tear on motor and mechanical systems. Traditional constant-speed motors start and stop frequently to adjust load, which causes mechanical stress on belts, pumps, and valves. Every start-and-stop cycle generates friction, wears down parts, and increases the chance of leaks or breakdowns. Our VSDs let motors ramp up speed gradually, eliminating those harsh start cycles. That means equipment lasts longer, so there’s less need for replacements. Less replacement equipment means less mining for raw materials like steel, copper, and plastic, and less waste from old motors and pumps ending up in landfills. One food processing client I work with has cut their equipment replacement rate by 25% since installing our VSDs on their mixing and packaging lines. They go from replacing 10 motors a year to just 7, and the old motors now go to a certified e-waste recycler instead of a landfill, but even that has a smaller footprint because fewer motors need to be recycled or disposed of overall.
Now, I’d be remiss not to address the tradeoffs—there are real environmental downsides to VSDs that we as suppliers can’t ignore. First, there’s the issue of embodied carbon. Embodied carbon is the total GHG emissions from extracting, processing, manufacturing, and transporting a product. Our VSDs are made with semiconductor chips, copper wiring, and cast aluminum parts, all of which have high carbon footprints associated with their production. For example, a standard 100-horsepower VSD has an embodied carbon footprint of roughly 1.5 tons of CO2 equivalent, according to a 2022 life cycle assessment (LCA) we commissioned. Compare that to a traditional constant-speed motor, which has an embodied carbon footprint of about 0.8 tons. So when you first install a VSD, you’re adding more embodied carbon than replacing a motor with another constant-speed unit.
That’s why the payback period is so critical. If a VSD is only going to be used for a year or two, the embodied carbon won’t be offset by energy savings. But for applications that run 8+ hours a day, the energy savings usually make up for the embodied carbon within 1-3 years. For industrial motors that run 24/7, that payback period is even shorter—sometimes less than a year. I always make sure to tell clients that a VSD isn’t a quick fix; it’s a long-term investment, and the environmental benefits compound over time.
Another tradeoff is the potential for harmonic distortion, which can affect the electrical grid and other equipment. VSDs use power electronics to adjust motor speed, and in some cases, they can generate harmonic currents that cause voltage distortion in the grid. That can lead to overheating in other electrical equipment, increasing wear and tear, and even reducing the efficiency of other appliances. For example, a hospital with multiple VSDs installed without harmonic filters might find that their lighting systems are flickering or their critical medical equipment is drawing more power to compensate for the distortion. That can lead to increased energy use for those other systems, eroding some of the VSD’s benefits. But here’s the thing: modern VSDs, like the ones we manufacture, come with built-in harmonic filters or can be paired with simple filters that mitigate this issue. The key is installing the right VSD for the application, and making sure it’s sized and configured correctly. I work with our engineering team to help every client design a system that minimizes harmonic distortion, whether that’s adding a small filter or choosing a VSD with a higher power rating for the specific load.
There’s also the matter of end-of-life recycling. VSDs have more electronic components than traditional motors, which can be harder to recycle. The semiconductor chips, circuit boards, and plastic casings require specialized recycling processes that not all facilities can handle. If a VSD ends up in a standard landfill, it can leach heavy metals like lead and mercury into the soil and groundwater. That’s why we’ve partnered with a certified electronic waste recycler that specializes in industrial power electronics, and we offer a take-back program for our VSDs at the end of their lifespan. We’ve found that about 92% of the materials in our VSDs—including copper, aluminum, and steel—can be recycled, and the remaining electronic components are processed safely to avoid environmental contamination. It’s an extra step, but as someone who cares about the planet as much as I care about our clients’ needs, it’s non-negotiable.
So, putting it all together: what are the real environmental impacts of using a Stepless Variable Speed Drive? It’s a net positive, but only when used correctly. For applications that run consistently and have variable load demand, VSDs deliver massive energy savings, reduced GHG emissions, less strain on natural resources, and lower waste from longer equipment life. But their embodied carbon, potential harmonic distortion, and end-of-life challenges mean they’re not the right solution for every scenario. A VSD on a constant-speed conveyor belt that never changes load? That’s a waste of money and resources. But a VSD on a HVAC system, a water pump, or a manufacturing line that has variable demand? It’s one of the most effective ways to reduce a facility’s environmental footprint right now.
Over the years, I’ve seen clients go from skeptical to passionate about VSDs because they’ve seen the results firsthand. The Ohio water treatment plant I mentioned earlier didn’t just save energy—they used their cost savings to upgrade their biosolids processing facility, reducing their reliance on chemical treatments. The automotive manufacturing plant cut their emissions so much that they qualified for a state-level environmental grant to add more renewable energy to their operations. That’s the ripple effect of a good VSD: it’s not just about the drive itself, it’s about the positive changes it enables across a facility.
If you’re considering whether a Stepless Variable Speed Drive is right for your operations, I’m here to help. Whether you’re a small business looking to cut HVAC costs or a large industrial facility targeting net-zero emissions, we can work with you to assess your load profile, size the right VSD for your needs, and make sure you’re minimizing environmental impacts every step of the way—from installation to end-of-life. Reach out to our team to discuss your project and start finding solutions that work for your goals.
References
Casting International Energy Agency. (2021). Motor Systems: Energy Efficiency Potential and Savings Opportunities. IEA Publications.
U.S. Environmental Protection Agency. (2022). Greenhouse Gas Inventory of U.S. Transportation. EPA Office of Air and Radiation.
Life Cycle Assessment Report: Stepless Variable Speed Drives for Industrial Applications. (2022). Internal Product Development Division, [Redacted] Drives Manufacturing.
Electric Power Research Institute. (2021). Harmonic Distortion in Variable Speed Drive Systems: Mitigation Strategies. EPRI Journal.
Sango Automation Limited
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