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You are here: Home / Archives for solar panels

solar panels

Solar Equity for Low-Income Communities

May 30, 2019 By EarthWise Leave a Comment

A couple of years ago, the number of American roofs covered with solar panels passed the one million mark and the numbers keep growing.  But nearly half of U.S. households – accounting for more than 154 million people – aren’t able to host their own solar arrays because they lack suitable rooftop space, or they rent their homes.  But millions more simply can’t afford to spend tens of thousands of dollars to buy or lease solar panels.

In recent years, community solar has become popular.  These are projects where multiple participants own or lease shares in a mid-sized solar facility and receive credits that lower their monthly utility bills.  Community solar in the U.S. has more than quadrupled just since 2016.

However, the majority of community solar subscribers to date have been businesses, universities, government agencies, and higher-earning households.  These users can generally pay steep project enrollment fees or meet various financial requirements.  Meanwhile, those who could benefit most from access to renewable energy and lower utility bills – low-income residents – have largely been left out.

Low-income households on average spend over 8% of their income on utility bills, about three times more than moderate- to high-income households.  So, reducing electricity bills with community solar power is a big deal for them.

Given this situation, there are now a growing number of programs that make use of community solar to reduce living expenses for low-income households.  In a dozen states, new programs include a variety of mandates, financial incentives, and pilot programs targeting benefits for people with low incomes.  These programs will allow them to participate in both the environmental and economic benefits of renewable energy.

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Energy Equity: Bringing Solar Power to Low-Income Communities

Photo, posted November 27, 2012, courtesy of Oregon State University via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Utility-Scale Solar On The Rise

May 8, 2019 By EarthWise Leave a Comment

According to research from Goldman Sachs, utility-scale solar power capacity is expected to grow by double digits globally over the next two years.  The growth will be driven by expanding use of the technology in the United States, Europe, the Middle East, and China.

Solar power is the world’s fastest growing source of electricity generation and is slowly taking market share from fossil fuels like coal and natural gas.  The transition is being driven by a combination of continuously lower prices for solar power and the impact of policies aimed at reducing emissions.

Utility-scale solar is defined as installations designed solely to feed electricity into the grid, in contrast to smaller-scale residential or commercial building units.  There are now solar farms larger than half a gigawatt in generating capacity.  According to the Goldman report, global utility-scale solar installations will reach 108 gigawatts in 2019, up 12% over the previous year, and will then grow another 10% to 119 gigawatts in 2020.

When residential and other smaller installations are included, most analysts expect global solar power capacity to soon hit 600 gigawatts.  To put this in perspective, the global capacity only reached 100 gigawatts in 2012 and was actually less than 10 gigawatts in 2007.

Even more dramatic than the growth of solar installations is the reduction in solar cost, and the two are obviously closely related.  Solar panel costs have dropped from around $70 per watt of electricity generated in 1980 to 36 cents per watt currently in the United States.  When favorable policies both from governments and related to corporate sustainability targets are added to the mix, the booming growth in solar power is easy to understand.

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Large-scale solar power set for double-digit growth: Goldman Sachs

Photo, posted March 7, 2019, courtesy of Hedgerow Inc via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Another Way To Make Solar Cells

March 21, 2019 By EarthWise Leave a Comment

Millions of rooftops now contain solar panels and the majority of the solar cells that make up those panels today are made from silicon.  Silicon solar cells require expensive, multi-step processing conducted at very high temperatures in special clean room facilities.  Despite these complications, the price of solar panels has continued to drop dramatically over the years.

But even as the price of solar cells gets lower and lower, there are still widespread efforts to find even better ways to make them.   One of those ways is with perovskite solar cells.  Perovskites are materials with a characteristic crystal structure and are quite common in nature.  Perovskites can be formed with a wide range of elements and can exhibit a variety of properties.

They were first used to make solar cells about 10 years ago and those first cells were unimpressive in most respects.  However, there has been steady progress since that time.  The potential advantages of perovskite solar cells are that they can be made from low-cost materials and can be manufactured using liquid chemistry, a far cheaper process than what is used to make silicon cells.

Researchers at MIT and several other institutions have recently published the results of research on how to tailor the composition of perovskite solar cells to optimize their properties.   What used to be a trial-and-error process can now become much more engineered and should lead to perovskite solar cells with performance that could exceed that of silicon cells.

Silicon solar panels are a huge, worldwide industry and displacing them in favor of an alternative technology is a tall order.  But if perovskite cells can be optimized for large-scale manufacturability, efficiency and durability, they could definitely give silicon a run for its money.

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Unleashing perovskites’ potential for solar cells

Photo courtesy of Ken Richardson/MIT.

Earth Wise is a production of WAMC Northeast Public Radio.

Powering Africa With The Sun

December 3, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/12/EW-12-03-18-Powering-Africa-With-The-Sun.mp3

There are roughly 600 million people in sub-Saharan Africa who currently live without electric power.  Putting in the infrastructure to supply power to these people in their various countries has been a major economic and logistical challenge.

[Read more…] about Powering Africa With The Sun

Capturing CO2 From The Air

November 9, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/10/EW-11-09-18-Capturing-CO2-from-the-Air.mp3

It is increasingly clear that the rate at which carbon dioxide emissions are being reduced is not sufficient to prevent dire consequences of climate change.  It appears that it will be necessary to try to actually remove carbon dioxide from the air.  Such actions are termed “negative emissions.”

[Read more…] about Capturing CO2 From The Air

California vs. Fossil Fuels

September 19, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/09/EW-09-19-18-California-vs-Fossil-Fuels.mp3

California has led the way in deploying and committing to clean energy for a long time.  In August its legislature strengthened that commitment by passing a bill to stop using fossil fuels entirely by 2045.   It is the second state to do so, following Hawaii.  The bill still needs to be passed by the Senate and signed by the governor.  Both actions are expected to occur.

[Read more…] about California vs. Fossil Fuels

Bacteria-Powered Solar Cell

August 29, 2018 By EarthWise 1 Comment

https://earthwiseradio.org/wp-content/uploads/2018/08/EW-08-29-18-Bacteria-Powered-Solar-Cell.mp3

Commercially-available solar panels are composed of solar cells that are most often made from various forms of silicon.  Some panels use thin-film cells made from other semiconductor materials.  Solar cells utilize a property of semiconductors that allows them to convert light energy into electrical energy.

[Read more…] about Bacteria-Powered Solar Cell

Mandatory Solar In California

May 30, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/05/EW-05-30-18-Mandatory-Solar-in-California.mp3

In May, California became the first state in the U.S. to require solar panels on almost all new homes.  Under new standards adopted by the California Energy Commission, most new homes, condos and apartment buildings built after January 1, 2020 will be required to include solar systems.

[Read more…] about Mandatory Solar In California

A Milestone For Energy Storage

April 24, 2018 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2018/04/EW-04-24-18-A-Milestone-for-Energy-Storage.mp3

The United States has now added the capacity to store a billion watts of power for one hour and it may double that total by the end of this year.   According to the firm GTM Research, the energy storage industry – previously nearly invisible – is undergoing rapid growth.  Much of the growth has been in homes with products like the Tesla Powerwall but has also been on the scale of the electric grid, where power companies can use storage to control when to deploy excess electricity generated from renewable sources such as solar power.

[Read more…] about A Milestone For Energy Storage

Transparent Solar Panels

December 6, 2017 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/11/EW-12-06-17-Transparent-Solar-Panels.mp3

 It is now commonplace to see solar panels on the rooftops of homes and businesses.  There are more than a million solar homes in the US alone.  But a new generation of see-through solar technology has the potential to also turn the windows of buildings and cars, as well as other glass-coated objects, into electricity generators.

[Read more…] about Transparent Solar Panels

New Places For Solar Cells

October 5, 2017 By EarthWise Leave a Comment

https://earthwiseradio.org/wp-content/uploads/2017/10/EW-10-05-17-New-Places-for-Solar-Cells.mp3

Solar panels are on more than a million rooftops in the United States, so they are getting to be a pretty common sight.   We also see them along our highways powering lights and signs and emergency call boxes.  As it gets cheaper and more common, solar technology is starting to show up in more unusual ways.

[Read more…] about New Places For Solar Cells

Spray-On Solar Cells

May 15, 2017 By EarthWise

https://earthwiseradio.org/wp-content/uploads/2017/04/EW-05-15-17-Spray-On-Solar-Cells.mp3

One of the most exciting possibilities for future solar energy technology is that of solar cells that can be sprayed or printed on to surfaces like the windows of skyscrapers, the roofs of sports utility vehicles, or the walls of houses.  And the expectation is that such technology would be far cheaper than today’s silicon-based solar panels.

[Read more…] about Spray-On Solar Cells

Utility-Scale Solar Power

May 11, 2017 By EarthWise

https://earthwiseradio.org/wp-content/uploads/2017/05/EW-05-11-17-Utility-Scale-Solar-Power.mp3

Solar panels on the roofs of houses have become a familiar sight in recent years, but utility-scale solar – installations of 10 megawatts and greater – are really booming these days.   Throughout the United States, more than 10.5 gigawatts of utility-scale solar were added to the electric grid in 2016 – enough to power more than 2 million homes – and at least 8 gigawatts more are scheduled to come online this year.

[Read more…] about Utility-Scale Solar Power

Islands Ditching Diesel

March 31, 2017 By EarthWise

https://earthwiseradio.org/wp-content/uploads/2017/03/EW-03-31-17-Islands-Ditching-Diesel.mp3

Islands around the world have a difficult time developing the infrastructure for electricity generation.  Many are simply too small or too poor for conventional power plants.  The most common electricity source on islands is diesel generators which are not environmentally friendly and result in some of the most expensive electricity in the world.

[Read more…] about Islands Ditching Diesel

Clean Power Is Cheap Power

January 31, 2017 By EarthWise

https://earthwiseradio.org/wp-content/uploads/2017/01/EW-01-31-17-Clean-Power-is-Cheap-Power.mp3

There are many good reasons why we should be making the transition from fossil fuel energy sources but the one that is likely to be the most persuasive is strictly economic.  It has long been said that the renewable energy future will truly arrive when installing new solar panels is cheaper than a comparable investment in coal, natural gas, or other options.

[Read more…] about Clean Power Is Cheap Power

More Renewables On Campus

January 16, 2017 By EarthWise

https://earthwiseradio.org/wp-content/uploads/2016/12/EW-01-16-17-More-Renewables-on-Campus.mp3

We recently talked about the increasing efforts by colleges and universities to embrace sustainability with the use of renewable energy sources.  Those efforts are increasing in many places.

[Read more…] about More Renewables On Campus

Renewables On Campus

December 12, 2016 By EarthWise

https://earthwiseradio.org/wp-content/uploads/2016/11/EW-12-12-16-Renewables-on-Campus.mp3

Colleges and universities across the country are increasingly deploying solar arrays and other types of renewable energy.   Many have set goals to become carbon neutral.

[Read more…] about Renewables On Campus

Renewable Energy As Art

November 25, 2016 By WAMC WEB

https://earthwiseradio.org/wp-content/uploads/2016/11/EW-11-25-16-Renewable-Energy-as-Art.mp3

When we think about the visual impact of energy plants, we usually envision ugly smokestacks belching out toxic fumes.  Of course, many people also consider wind turbines to be eyesores and even solar panels are often viewed unfavorably from an aesthetic point of view.

[Read more…] about Renewable Energy As Art

A Giant Solar Power Plant In India

October 19, 2016 By WAMC WEB

https://earthwiseradio.org/wp-content/uploads/2016/10/EW-10-19-16-Giant-Solar-Power-Plant-In-India.mp3

In late September, the world’s largest solar power plant went online in the Indian state of Tamil Nadu.   It is a 648 MW array of solar panels that is spread across 2,500 acres in the town of Kamuthi and will supply enough energy to power 300,000 homes.

[Read more…] about A Giant Solar Power Plant In India

Virtual Power Plants

September 22, 2016 By WAMC WEB

https://earthwiseradio.org/wp-content/uploads/2016/09/EW-09-22-16-Virtual-Power-Plants.mp3

The traditional model of the electricity grid is one where centralized large power plants send power through transmission lines to substations and then on to homes and businesses.  As localized renewable energy sources, energy storage systems, and efficiency systems proliferate throughout the system, a new concept is emerging:  that of the virtual power plant.

[Read more…] about Virtual Power Plants

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