are solar panels toxic or dangerous

Are solar panels toxic to the environment?

For many homeowners, one of the primary motives for going solar is to have a positive impact on the environment. When you use solar energy in your home, you lower your overall greenhouse gas emissions like carbon dioxide, and you reduce your carbon footprint.

While solar panels are considered a form of clean, renewable energy, the manufacturing process does produce greenhouse gas emissions. Additionally, to produce solar panels, manufacturers need to handle toxic chemicals. However, solar panels are not emitting toxins into the atmosphere as they’re generating electricity.  

What to remember about solar panel toxicity

  • Solar panels are not directly toxic, and having them on your property is not a health risk
  • There are potentially harmful chemicals used in panel production, but responsible manufacturers will dispose of them properly
  • Start comparing solar quotes from reputable installers on the EnergySage Marketplace today

Chemicals in the solar manufacturing process: are they dangerous?

The primary material used for solar cells today is silicon, which is derived from quartz. In order to become usable forms of silicon, the quartz has to be mined and heated in a furnace (which, in turn, emits sulfur dioxide and carbon dioxide into the atmosphere).

There are some chemicals used in the manufacturing process to prepare silicon and make the wafers for monocrystalline and polycrystalline panels. One of the most toxic chemicals created as a byproduct of this process is silicon tetrachloride. This chemical, if not handled and disposed of properly, can lead to burns on your skin, harmful air pollutants that increase lung disease, and if exposed to water can release hydrochloric acid, which is a corrosive substance bad for human and environmental health. Fortunately, there is a process that most manufacturers employ to safely recycle silicon tetrachloride back into the manufacturing process for new silicon wafers, helping to eliminate health and environmental risks.

The large majority of panels used in installations are safe, silicon-based panels; however, if you’re installing thin-film technology, there are additional toxic materials contained in the thin-film panels itself, such as cadmium telluride and copper indium selenide. These materials are used in the manufacturing process for many other electronics, like your cell phone or laptop. Thin-film panels are not common for residential solar installations and are most often used in large commercial or utility scaled applications.

While these chemicals can be considered as hazardous, they aren’t so while the panels are on your roof. The concern for their toxicity comes into play during the manufacturing process, as well as disposal process from by-products during the manufacturing process, and at the end of the panel’s lifetime. 

Responsible solar panel manufacturers will ensure that the chemicals used in the manufacturing process are handled properly. Unfortunately, there have also been instances in the past of dumping hazardous into nature in various parts of the world (such as China). The resulting public outcry caused stock prices of manufacturers involved in these instances to drop, and solar companies started to implement more stringent rules and regulations in regards to recycling and disposal to protect against this happening in the future.





Don



If solar panel manufacturing uses toxic chemicals, why is it considered green energy?

During the lifecycle of a PV system, the majority of greenhouse gas emissions occurs during the manufacturing process. As solar panel manufacturing becomes more efficient, its carbon footprint shrinks significantly: a 2016 study reports that the overall emissions produced in this process decreased by 17 to 24 percent every time install capacity has doubled in the last 40 years.

As your solar panel system produces electricity on your roof, it is 100 percent renewable, free of pollutants and emissions. It is also directly impacting your carbon footprint, and the carbon footprint of your community.

If your primary aim in going solar is to benefit the environment, you can rest easy knowing that while the manufacturing of solar panels produces greenhouse gas emissions, your panels are still much better for the environment than other options. The overall greenhouse gas emissions involved in solar energy is still much lower than coal or natural gas. A 2011 report showed that solar’s carbon footprint averaged at roughly 85 tonnes of carbon dioxide equivalent (CO2e) per gigawatt-hour (GWh), while natural gas and coal came in at 499 CO2e/GWh and 888 CO2e/GWh, respectively.

While solar panels, like other electronics, contain and are manufactured using toxic materials, measures can be taken to minimize negative effects. Silicon tetrachloride, mentioned above as one of the most toxic chemicals involved in the manufacturing of panels, is usually recycled by manufacturers as a cost-saving measure. They can use this byproduct to create more polysilicon, and therefore more panels. Many of the other toxic chemicals and products in solar panels can also be recycled.

Recycling of the panels at the end of their life is also a growing trend. Some manufacturers (like SunPower and First Solar) offer global recycling programs for their customers. While not all manufacturers offer recycling programs today for old panels, it hasn’t been a huge concern considering the lifespan of these panels. Solar panels didn’t start becoming widely popular until the 1990s (and even more so post-2000s). As a result, the majority of panels are still useable and producing electricity. Because of the rising popularity of solar, recycling programs and companies are expected to be even more prominent in the near future than they already are.

Silicon Valley Toxics Coalition

Many panel manufacturers are focusing on sustainability in the manufacturing process to promote the health of the earth, as well as employees and factory workers involved in the production of their panels. A nonprofit organization known as the Silicon Valley Toxics Coalition is leading the pack in advocating for sustainable practices for electronics manufacturers, including solar panel companies. They publish a report known as the Solar Scorecard that evaluates a variety of panel manufacturers on their environmental protection measures, as well as measures for their employees and their communities.

The scorecard uses a few different factors to determine manufacturer ranking on the Solar Scorecard, including emissions tracking, how many toxic materials are included in their modules, water usage in manufacturing, the use of conflict materials (which are those that come from various areas of Africa with unjust mining practices), and worker’s rights.

In the most recent Scorecard, SunPower was given the highest ranking of the companies that responded to the survey, followed closely by SolarWorld, Trina, Aleo, and Jinko.

Going solar and staying green

Manufacturers are continuing to improve their sustainability efforts, and if you’re looking to install a solar panel system that’s as green as possible, the Solar Scorecard can be a good resource to use to find out more general information about various manufacturers.

That doesn’t mean that you should automatically rule out companies that aren’t included in the list, or appear very low on it. While this scorecard is a good resource for homeowners who want the assurance of a sustainable manufacturing process to be as high as possible, it’s worth noting that there are many panel manufacturers that don’t respond to the survey from this organization, or don’t accurately track factors used in the scorecard and therefore cannot report on it.

Keep in mind that your solar panels will keep producing electricity for 30 to 35 years. We’re very optimistic that as time goes on, recycling options for solar panels will improve. Every item’s manufacturing process has an ecological and social footprint, but the environmental benefit from going solar now and overtime outweighs sticking with a utility company and using dirty energy (and saves you money too!).

As your considering your solar options, we recommend signing up on EnergySage to receive multiple quotes from pre-screened installers. These quotes will include information about the type of panel they’re recommending, and can also be updated according to your preferences (as most installers offer multiple equipment packages!) If you’d prefer to start with an estimate on potential costs and savings of a solar installation, try our Solar Calculator.





Don



10 thoughts on “Are solar panels toxic to the environment?

  1. Paul Dawson

    If hydrochloric acid is bad for humans, why do our stomachs produce this chemical? Hmm?
    I guess we’d better stop using concrete because of all the toxins released by the manufacture of cement.
    What about the steel industry and all of its supporting industries? Coal and limestone to name a couple.
    Hey, they use aluminum to make the rails that hold the solar panels in place… that produces tons of toxic by-products like fluorides and carbon dioxide. Shouldn’t we stop using that too? What about the megawatts of electricity needed to produce it?
    The gas and oil industries produce tons of by-products that have detrimental effects on our planet. A major pollutant from the beginning of its collection to the end of its use, whether it is used as a fuel or feed-stock for the plastics industry or even the pharmaceutical industry. As a fuel, it produces a lot of heat and greenhouse gas when it is burned. When it comes out of the ground, it brings another ton of pollutants and toxins with it. It also consumes megawatts of electricity during its production as well as cubic metres of water which contain more toxic chemicals that need to be removed before it can be returned to the rivers or seas.
    I see that scaremongering is alive and well in our world.
    EVERYTHING we use has consequences and solar panels may contain a few nasties and may be made using toxic chemicals but with judicious use and care, they can be more beneficial than oil, coal and other forms of energy. Most, if not all the chemicals can be reclaimed and either reused or disposed of safely as better processes become available in their manufacture.

  2. kim yoder

    Dear Paul —
    In the great cities, like London, citizens used to dump their chamberpots into the streets, to let the rain wash waste down to the rivers or seas. As they became aware of the health problems exacerbated by this practice, they developed better waste disposal (except New York City, which switched from barges to trains, trying to dump it anywhere they can…) systems. Were those who called for better technology “scaremongers”?? Electricity first came as exposed bare wires run along the inside of rooms, but improvements have made it very safe. Did electrocutions bring out “scaremongers” or did they bring out safety advances? The same goes for every tech we have: someone innovates, to solve a problem, but every day and year, others work to make that innovation more efficient, and safer.

    Everything you listed is something that should be looked at to clean up. We have to stop burning coal for electricity, but getting natural gas by fracking is NOT an improvement; we have to stop burning petroleum for transportation, but if the alcohol used for E85 fuel uses more petroleum than it replaces, that makes no sense and is an ecological burden. No, Paul, it is good and necessary to move forward with “green” options, but we have to seek out better and safer improvements, even on “green” tech.

    All of us, like this article, can be quite positive about what we have, while constantly seeking to improve.

  3. Em

    This article is making generalized stantents about solar energy as a whole, while not considering the fact that not all solar panels are made using silicon. Many solar panels, actually, are not made with silicon and can produce cheaper and more efficient energy. If you are against the use of silicon in some solar panels, I understand, but would be wrong to make generalized negative statements about solar power when not all solar panels use silicon.

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