For many Idaho homeowners, a solar system is an investment, so it’s reasonable to expect that investment to have a long lifespan.
However, one common misconception we hear about rooftop solar is that panels only last about ten years. In reality, today’s solar panels are engineered for decades of performance, with most residential systems designed to last 25 to 30 years. Many continue producing electricity well beyond that with only a gradual loss of output over time.
Solar Panel Lifespan and Degradation: What to Expect in Idaho
When homeowners in our region ask how long their solar panels are expected to last, the answer depends on both the quality of the products installed and the conditions.
As the panels that comprise a solar array age, they do not usually stop generating energy all at once. Instead, they experience a slow decline in output over time. This process is referred to as solar panel degradation, and it is normal. Degradation doesn’t mean a panel is failing, but rather that it is aging from long-term exposure to sun, weather, and environmental conditions. (If your system has experienced a sudden loss in the output of power, our service department may be able to help.)
Industry research has found median degradation rates to be around 0.5% to 0.75% per year. This supports claims that a well-built system using high-quality panels can continue generating electricity for decades. In fact, a system installed today may still be producing a large share of its original output 25 or 30 years later. A 2025 study even found that six different photovoltaic systems installed across Switzerland between 1987 and 1993 still retained more than 80 percent of their initial power — despite being 32–38 years old!
How Idaho Weather Affects Solar Panel Performance
Idaho’s weather is a powerful test for rooftop solar products. Homeowners in Southwest Idaho deal with hot summers, cold winters, snow, wind, and temperature swings throughout the year. High-quality, modern solar panels are built to handle these conditions, as they are designed for UV exposure, freeze-thaw cycles, and snow loading. Short-term weather changes (like inversions) may affect production, but they do not usually shorten the life of the panels when the system is installed correctly.
The longevity of an array’s solar panels also depends on the quality of the racking, flashing, wiring, and the installed inverter. A properly installed system should deliver consistent output throughout Idaho’s changing seasons.
What Else Affects Solar Panel Performance Over Time?
Other factors that affect the performance of a solar array are roof angle, shading, dirt buildup, maintenance, and local climate. In Idaho, snow cover and the sun’s seasonal angle can also affect output, which is expected.
If a system underperforms unexpectedly, the issue is often related to an inverter, wiring, or shading problem rather than the solar panels themselves. One reason why solar technology is so dependable is that components in a system are built to be monitored and maintained, not constantly replaced. A quality system should continue to produce reliable power for decades with only minor performance updates and maintenance over time.
The Lifespan of Solar Panels vs. Components
Solar panels are usually the most durable part of a system, and often outlast many other home energy components. Inverters, monitoring equipment, or other electrical parts may eventually need replacement, but that’s much different from replacing the entire array. In most cases, the panels continue producing electricity long after other parts have been serviced or upgraded.
A Solar Energy System’s Long-Term Performance
For homeowners, it’s important that a solar energy system continues to produce enough electricity to deliver value throughout its lifespan. Most manufacturers guarantee that the panel will still produce a certain percentage of its original output after a set period, usually 25 years. (Oftentimes, panels are warranted to produce around 80% to 85% of their original output at that point.)
However, many panels continue working well beyond the warranty period, especially when they are properly installed and maintained. When solar is installed correctly, properly maintained, and the conditions are right, it’s not uncommon for a solar energy system to produce power for 30+ years.
Idaho Homeowners: Know Your Solar Warranties
For Idaho homeowners comparing solar proposals, a solid warranty is a clear sign of a system’s long-term quality. Both solar manufacturers and installers should be transparent about these warranties. As with most investments, we recommend reading the fine print.
A product warranty: covers defects in materials, and warrants that any products installed in accordance with the initial installation agreement will be free from defects and/or production complications/failures for a set period.
A workmanship warranty: an installer warrants to the original purchaser (property owner at the time work is completed) that any installation procedures performed will be free from workmanship defects for a set period of time (the warranty period) from the completion of the installation.
(Read more about EGT Solar’s specific product and workmanship warranties here.)
Solar Recycling and the Circular Economy
At some point, a solar module will reach the end of its life, and repair or replacement makes more sense than its continued use. When that happens, materials can often be refurbished or recycled depending on their condition. This isn’t just a feel-good gesture, either — the U.S. EPA has put regulations in place to ensure that solar panels are managed safely at the end of life.
Industry organizations such as the Solar Energy Industries Association (SEIA) have developed recycling and recovery pathways to support responsible disposal and material recovery.
In the recycling process, materials like glass, aluminum, copper, and other recoverable components can be reused. Recycling typically begins with removing the aluminum frame and junction box, followed by separating the glass and processing the remaining module materials to recover valuable resources such as silver, silicon, and copper. This supports the circular economy (which keeps materials in circulation instead of sending them to the landfill after a single lifecycle).
It’s also important to note that most residential systems installed today are still too new to be entering end-of-life recycling in large numbers. That’s a good thing! These systems are designed to last for decades, which means most homeowners’ solar panels are still performing well and generating savings, and disposal isn’t on the horizon for many more years. However, when that time comes, recycling and recovery options are available. (Find a vetted list of SEIA’s PV Recycling Partners here.)
Rooftop Solar As a Long-Term Energy Solution in Idaho
For homeowners in Boise, Meridian, Eagle, Nampa, Caldwell, and across Southwest Idaho looking to stabilize utility costs and make their homes more efficient, a rooftop solar system is often the answer. And, despite what some might claim, solar can deliver value for decades.
If you are considering solar, now is a great time to take the next step. As a trusted local installer of high-quality panels and components, EGT Solar can evaluate your roof, explain your expected system performance, and help you estimate your long-term savings — all while providing a robust warranty and service capabilities that will protect your system for the long haul. Ready to get started? Get your free estimate here.
