 By Sarah Lozanova, Solar Energy Writer
As solar energy deployment increases, solar farms are becoming bigger than ever before. Large-scale solar farms have ground-mounted solar panels. Therefore, the way developers plan and manage those impacts wildlife and local ecosystems. How can solar professionals minimize the ecological impacts of solar farms? It is essential to examine this question throughout all phases of solar farm development, from the initial planning phase to decommissioning. Alternatives to Mowing It is critical to minimize or eliminate shading on solar panels to boost electricity production. Therefore, many solar farm managers mow around the solar panels with gas-powered mowers and use herbicides. Unfortunately, these produce carbon emissions, burn fossil fuels, and contaminate air quality and water quality. Using sheep to graze around the solar panels reduces or eliminates the need to mow and apply herbicides. Sheep are excellent at removing vegetation, even between solar panels. This prevents shading without chemicals or gas-powered equipment. Encouraging Wildlife Often, solar farms contain non-native plants or even gravel around the solar panels. This groundcover provides little value to wildlife, especially pollinators. Planting native wildflowers can help reduce the need to irrigate the groundcover, conserving water. Likewise, it gives fodder to pollinators. Once established, this landscape can reduce maintenance, saving money. Also, pollinators can provide a lot of value to farmers. If there are agricultural farms located nearby, native plants can help maintain pollinator populations, which can sometimes help protect crop yields. Promoting Soil Health Grazing sheep, cultivating native plants, and not apply herbicides all help maintain soil quality. In fact, soil health is critical for healthy ecosystems and productive farms. Solar farms may become cropland or wilderness areas after the solar farm is decommissioned. Thus, promoting soil health can help promote productive use of the property several decades from now. Read More...  By Sarah Lozanova, Solar Writer
The United States now has enough installed solar energy capacity to power 17.7 million homes. Although this is fantastic for air quality and greenhouse gas emissions, it means there is a looming e-waste issue on the horizon. At some point, the photovoltaic panels will no longer generate enough energy. Is it possible to recycle solar panels when they have reached their end of life? The design life of solar panels is 25 to 30 years. Over time, solar modules become less efficient in converting sunlight to electricity due to degradation. Most of the solar panels in the U.S. were installed in the last decade. The efficiency of the panels will decrease and need to be replaced. Broken solar panels are good candidates for a refurbishing program. Currently, only a small fraction of solar panels are recycled. The lack of governmental policies, infrastructure, and foresight in the module design process makes solar panel recycling expensive and arduous. For solar energy to truly produce clean energy, we must recycle solar panels effectively. What materials are in solar panels? When exploring recyclability, it is helpful to consider the components that make up a solar photovoltaic (PV) panel. Silicon-based modules are comprised of glass, plastic, aluminum, and silicon. Unfortunately, they also contain trace toxic compounds, such as lead, which can leach into groundwater if not properly disposed of. Cadmium telluride (CdTe) is found in thin-film solar and is toxic and a carcinogen. Because thin-film currently constitutes less than 5% of the global module market, it is a smaller-scale concern. How are solar panels recycled? To recycle the modules, they must be disassembled to remove the glass and the metal components in the frames and junction boxes. Unfortunately, the remaining materials make a low-value product that is largely downcycled into low-value products. As a result, material recovery rates are often around 85%, and the demand for the recycled materials is low. How can we improve solar panel recycling? Extending the life of decommissioned solar modules through refurbishing is an appealing option when possible. Such initiatives create a secondary market for solar PV materials that can help keep prices down while reducing waste. To achieve dramatic advancement in recycling initiatives’ value and recovery rates would require the direct reuse of materials in the frame, glass, tabbing, and solar cells. The copper, silver, and silicon also provide a valuable opportunity if they can be effectively recovered. For example, silicon could be recycled back into solar panels or the anodes of lithium-ion batteries. If achieved, this could reduce waste while conserving energy and resources. Where can I recycle solar panels? Although the U.S. lacks a national network for solar panel recycling, there is a patchwork of recycling options. The Solar Energy Industries Association’s (SEIA’s) National PV Recycling Program has designated Preferred Recycling Partners that meet certain standards. Two solar manufacturers lead the way in their recycling efforts: First Solar and SunPower. Read more...  By Sarah Lozanova, Solar Writer
Technological advances have transformed the solar energy industry in recent years. Solar panels are significantly more efficient, producing more power in the same amount of space. Meanwhile, prices continue to fall, reducing the cost of solar electricity. But with the introduction of new technologies comes uncertainty. Which solar panels are the most reliable and durable? What technology creates the least amount of pollution in the manufacturing process? Do panel manufacturers use recycled components or provide solar panel recycling options at the end of life? Let’s explore some of these critical issues in the pursuit of the best solar panels on the market. We compared the efficiency, warranty, environmental performance, and more of the following solar panel models in the comparison chart below.
A Dynamic Industry At times, supply delays and surpluses have plagued the solar industry. For example, China slashed solar subsidies for domestic solar installations in May 2018. This move created a lag in demand, causing a surplus of solar panels and falling prices across the industry. More recently, the Trump administration enacted a U.S. solar tariff on panels, but this is tapering down. Also, the federal tax credit was extended by two years at 26%, effective in 2021. Because solar panel technology is advancing, the market is very dynamic. New products are frequently being released as others become obsolete. The cost of advanced solar batteries has been dropping as demand has surged. The most efficient solar panels on the market today will probably not seem so efficient in a decade as the technology matures. Companies that are relatively unknown could capture a larger share of the market. Solar Panel Considerations Efficiency Solar panels have become significantly more efficient in recent years. And the more efficient a solar panel is, the more electricity it generates in a given space. Space becomes more critical when there are constraints due to the size of your roof or property. Unfortunately, more efficient panels typically cost more. If space isn’t an issue, efficiency becomes less crucial. For installations limited by space, panel efficiency is an essential consideration. It is also important to consider the long-term efficiency of solar modules. Read More...  By Sarah Lozanova, Solar PV Writer
U.S. solar generation capacity is soaring. Construction began recently on the Samson Solar Energy Center, the largest planned solar energy farm in the United States. When completed, the solar farm will have 1,013 megawatts of generating capacity. This solar farm will be considerably larger than the 690 MW Gemini solar project with battery storage under construction outside of Las Vegas, which had been the largest project in the U.S. Invenergy is developing the Samson solar farm, which will span three counties in Northeast Texas near the Oklahoma border. The project will create an estimated 600 construction jobs and $450 million in tax revenue and landowner lease payments. Developers are planning construction in five phases, with a 2023 expected completion date. Texas is a leader in renewable energy production in the U.S. due to its excellent solar and wind energy resources. It leads in the nation in installed wind energy capacity and trails California for installed solar energy capacity. Who will purchase the solar energy? Corporations have already signed virtual Power Purchase Agreements (PPAs) for Samson’s solar electricity. “The Samson Solar Energy Center is the latest example of what can be achieved when companies and utilities seek an innovative partner to meet their sustainability goals and invest in a clean energy future,” said Ted Romaine, senior vice president of origination at Invenergy. The largest share, 500 MW, will go to AT&T, which says it will be the biggest corporate U.S. solar deal to date. This agreement is a big step forward in AT&T’s goal to be carbon neutral by 2035. The corporation’s multi-facet plan includes transitioning to a low-emissions fleet, increasing energy efficiency, and purchasing carbon offsets. In addition, Honda has an agreement for 200 MW, McDonald’s for 160 MW, and Google for 100 MW. AT&T, Google, and Honda have already been leaders in renewable energy use. According to the Renewable Energy Buyer’s Alliance Top U.S. Energy Buyers of 2019, Google ranks second, AT&T third, McDonald’s ninth, and Honda tenth. Tech giants have helped lead the way with sourcing renewable energy, due in part to consumer and investor concern over dirty energy powering data centers. Read More...  By Sarah Lozanova, Solar Energy Writer Many homeowners want to install a solar electric system but don’t know if their roof gets enough sunshine. The return on investment from the solar panels and the positive environmental benefits are highly dependent on the energy production. Here’s the essential information to determine if a house has ample solar potential. Roof Orientation Solar energy systems generate the most electricity when the panels are pointed south. If the orientation of the roof is slightly off from due south, it won’t have a dramatic impact on the total energy production. If the solar panels face east, they will generate more energy in the morning. Conversely, if the panels face west, the system will have excellent afternoon production but little in the morning. It is not recommended to install panels on a north-facing roof (in the northern hemisphere). To determine the energy loss due to orientation, go to the PVWatts website and edit the azimuth field. Shade from Trees and Buildings Although trees are wonderful, they can have a negative impact on solar production. Buildings and trees located east, west, and especially south can hinder electricity output. The most crucial window is the mid-day hours, between 9 am and 3 pm. Thus, obstructions on the south side of the home can have the biggest impact. If trees are an issue, trimming certain branches might be highly beneficial. Evergreen trees can have the biggest impact on solar panels because they create shading throughout the year. Deciduous trees tend to not have leaves when the sun is lower in the sky during the cold weather months. When planting new trees, select shorter varieties or plant them on the north side of the home. Read More... Image Credit: Sundog Solar Do solar panels work on shaded roofs? By Sarah Lozanova, Solar Energy Writer
A big concern with large-scale solar farms is the impact on land use. Solar developers often site projects on agricultural land that is taken out of production. Also, the vegetation around solar panels needs to be maintained to prevent shading. In some cases, herbicides are used, contaminating waterways, and mowing generates pollution. If the developer applies gravel or plants turfgrass, the land has little wildlife value. As the local food movement gains steam, isn’t it counterproductive to turn productive cropland into an energy plant? How can the solar energy industry embrace biodiversity while producing clean energy? Is dual use of a solar site possible? Solar farms can be managed to increase pollinator habitat, improve soil quality, and even for livestock grazing. Innovative land management approaches enable solar projects to serve multiple purposes, benefitting the local economy. Keeping honeybees, grazing sheep, and even cultivating mushrooms can all complement a solar energy project. Native Wildflowers Boost Pollinator Habitat Researchers with the Argonne National Laboratory are examining the economic benefits of establishing native vegetation, including wildflowers and prairie grasses, on nearby cropland. Native vegetation attracts crucial critters like bees, flies, bats, birds, wasps, moths, and butterflies, which can be beneficial to crop yields. Researchers with the Argonne National Laboratory are examining the economic benefits of establishing native vegetation on nearby cropland, including wildflowers and prairie grasses. A diverse array of native plants benefits wildlife diversity, especially pollinators. These crucial critters include bees, flies, bats, birds, wasps, moths, and butterflies, and can be beneficial to crop yields. Read More... Image Credit: Danny Piper of Sundog Solar  By Sarah Lozanova, Solar PV Writer There is now enough installed solar energy capacity in the U.S. to power 13.5 million homes, and this amount is expected to double in the next five years. The solar energy industry is part of a very dynamic market. Many factors — including government policies, fossil fuel costs, solar energy technology advances, commodity prices, and even public awareness of the climate crisis — impact solar energy deployment across the globe. What’s in store for the year ahead? Let’s explore some trends in solar energy to better understand what is on tap for 2020. Solar Battery Prices Are Falling Solar energy is an intermittent energy source. This means that solar panels produce power when the sun is shining and not when it isn’t. Energy storage allows the solar system to supply power when the sun has set or in cloudy weather, expanding the capabilities of solar energy systems. There are two main types of solar batteries: lead-acid batteries (like you have in your car) and lithium-ion batteries. The latter is far more advanced, longer-lasting, and requires less maintenance. Not surprising, lithium-ion batteries have a higher upfront cost, but the price has been decreasing significantly in recent years. The cost of lithium-ion battery storage fell 35 percent from the first half of 2018 to now (December 2019) and 76 percent since 2012. This downward price trend is good news for renewable solar energy in 2020 — and it’s likely to continue. Natural gas plants are often used to meet peak energy loads because they can more easily be turned on and off than coal or nuclear power plants. Lower costs make it easier for intermittent renewable energy sources — such as wind and solar — to be cost-competitive with dispatchable fossil-fired power plants. Price decreases in utility-scale battery banks now make solar plus energy storage competitive in many areas on price alone. Battery banks can make it unnecessary to fire up power plants during times of peak demand, reducing fossil fuel consumption. The greater the capabilities of solar, the less attractive and financially viable these peaker power plants become. On the residential side, more homeowners are relying on solar systems with battery storage for emergency power during grid outages than ever before. This is an especially attractive option in areas prone to extended power outages due to natural disasters or with inadequate utility infrastructure, like Puerto Rico. Read More... Image Credit: Sundog Solar Trends in Solar Energy - Clean Energy Writer By Sarah Lozanova, Solar Panel Writer
The U.S. has more than 2 million solar installations. This means there are tens of millions of solar panels on roofs and racking systems. Solar energy is fantastic for reducing carbon emissions and promoting energy independence, but what happens at the end of the panel’s 30-year lifespan? There is a looming waste management issue as solar systems age and will eventually be decommissioned. Is the U.S. prepared for large-scale solar panel recycling? “Installations two decades ago are nearing their end of life, and that becomes a challenge for the waste industry,” says Garvin Heath, a senior scientist in the Strategic Energy Analysis Center of the National Renewable Energy Laboratory (NREL). “Because it takes a long time to develop technology and policy and solutions to dealing with end-of-life products, this is something we need to start to address today.” According to Heath, solar panels could comprise more than 10 percent of global electronic waste by 2050. Solar panel recycling presents an economic opportunity and can spawn new industries. A study by the International Renewable Agency (IRENA) estimates that by 2050, $15 billion could be recovered from recycling solar panels. There are also repair and reuse opportunities for solar panels that fail prematurely. These repaired solar panels are often sold at a discount, creating opportunities in new markets where affordability is an issue. What Parts of the Solar Panel Can Be Recycled? Glass, plastic, aluminum, and silicon comprise 99 percent of the silicon-based solar panels. Read More... Image Credit: Nichole McClure  By Sarah Lozanova, Solar PV Writer The solar energy industry is booming across the United States and beyond. As jobs in the coal industry slump, careers in solar energy are taking off. In the U.S., 855,000 people were employed in the renewable energy industry either directly or indirectly in 2018. Over 240,000 of these people work in the solar energy industry, and this number is growing quickly. The U.S. trails China and Japan in solar energy jobs, with China employing 2.2 million or 61 percent of the global total. Although solar jobs exist across the U.S., California, Florida, Massachusetts, New York, and Texas lead the way in solar industry jobs. To learn about the breakdown of solar jobs by location and sector, visit the Solar Job Census map. Reports for individual states highlight how many jobs exist in installation, manufacturing, distribution, and operations and maintenance. In most states, installation jobs lead the sector in total jobs. If you are interested in entering the solar energy field, there are a variety of different careers available. Like any other industry, the solar energy industry needs dedicated professionals to help it thrive. Let’s look at some of the career options in solar energy. Solar System Installer Solar installers put solar panels on the roof and connect them to the electric panel. This job requires some training, which you can often get on the job, and general construction and electrical experience are helpful. Installation classes and training programs are available through solar manufacturers, solar organizations, or programs at community colleges and trade schools. Obtaining NABCEP certification could also help your career advancement as it the most recognized certification in the solar energy industry. Read More... Image Credit: Sundog Solar Careers in Solar Energy - Freelance Copywriter By Sarah Lozanova, Solar Panel Writer
Technological advances have transformed the solar energy industry in recent years. Solar panels are significantly more efficient, producing more power in the same amount of space. Meanwhile, prices continue to fall, reducing the cost of solar electricity. But with the introduction of new technologies comes uncertainty. Which solar panels are the most reliable and durable? What technology creates the least amount of pollution in the manufacturing process? Let’s explore some of these critical issues in the pursuit of the best solar panels on the market. Solar Panel Considerations Efficiency Solar panels have become significantly more efficient in recent years. And the more efficient a solar panel is, the more energy can be generated in a given space. Space becomes more critical when there are constraints due to the size or your roof or property. Unfortunately, more efficient panels typically cost more. If space isn’t an issue, efficiency becomes less crucial. For installations limited by space, panel efficiency is an important consideration. It is also important to consider the long-term efficiency of solar modules. Long-Term Power Generation Like most other things, solar panels degrade over time. They become less efficient in turning sunlight into electricity. This is important because solar panels can last 30 years and you want your solar system to be churning out a lot of energy a couple of decades from now, even if someone else owns the home. Solar panel manufacturers offer a power production guarantee to ensure a certain level of output over a given time. Many solar panel manufacturers provide a guarantee of 90 percent production for 10 years and 80 percent for 25 years. Read More... Image Credit: Nichole McClure |
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