California Generates Enough Solar Power to Meet Half Its Energy Needs
By Jeremy Deaton
California Gov. Jerry Brown (D) took a shot at Sec. of Energy Rick Perry, former Republican governor of Texas. Remarking on Perry's view of Texas as an energy powerhouse, Brown said, "We've got more sun than you've got oil."
Recent data shows California coming through. The state briefly generated enough solar power to meet nearly half of the state's electricity needs, according to data from the largest grid operator in the state, California ISO.
Around midday on March 3, demand reached around 29 Gigawatts (GW), while solar was providing nearly 14 GW of generation—some 9 GW from utility-scale arrays and another 5 GW or so from rooftops and parking lot canopies around the state.
California's renewable energy output, midday on March 3.California ISO
"It's remarkable that over a third of the solar power generated in California comes from smaller rooftop systems, meaning hundreds of thousands of homeowners are reaping the economic value generated from harnessing the sun rather than the state's big utility companies," said Amit Ronen, director of the GW Solar Institute.
To be fair, the numbers from California ISO are a little squishy. First, California ISO may be the biggest grid operator in California, but it is not the only grid operator. Its numbers do not account for power demand or solar generation in Los Angeles or Sacramento, for instance.
Second, there is no real-time data on California's rooftop solar generation. We know that California has about 5 GW of installed rooftop solar capacity, meaning that if every rooftop solar panel in the state pointed directly at the sun on a cloudless day, they would generate more than 5 GW. Under real-life conditions, they generate slightly less.
But while these numbers are a rough approximation, they illustrate the incredible growth of renewable energy. They also highlight the central challenge of integrating solar into the power grid.
California's net power demand, midday on March 3. California ISO
See the dotted blue line in the graph above? That represents estimated demand. The saddleback-shaped dip in the line is the handiwork of rooftop solar panels, which generate power locally, suppressing demand. After the sun sets, around 6 p.m., demand shoots up again.
But solar power isn't just coming from rooftops. It's also being generated by large-scale arrays operated by utilities. Subtract the electricity generated by utility-scale renewable energy and you get the net power demand, represented by the green line. The green line shows how much energy conventional power plants need to generate to keep the lights on in California. That enormous dip and the subsequent spike, form what energy geeks call the duck curve.
The duck curve, as illustrated by changes in changes net power demand in California. CAISO
Every year, California generates more and more power from solar, exacerbating that midday dip in net power demand. This is problematic, because it's expensive to ramp up power generation from coal- and gas-fired power plants at dusk. Fortunately, there are ways to flatten the duck curve: building out transmission lines to carry solar energy over state lines would broaden the demand; installing grid-enabled appliances that shift demand to the middle of the day; or deploying battery storage, like the Tesla Powerwall, that can store excess generation during the day and discharge it in the evening.
"We still need to make significant investments in energy storage technologies that will allow us to bank solar energy when it's being made so that it can be used whenever we need it, even at night," Ronen said.
The state is aiming to generate 50 percent of its power from renewables by 2030. As part of that effort, legislators are looking for ways to better integrate solar energy into the power grid—to drive down costs, improve performance and flatten ducks, wherever they may quack. So, in September, California passed four bills to expand the use of energy storage.
U.S. Supreme Court Justice Louis Brandeis once described the states as laboratories of democracy. They are also laboratories for energy innovation. As the federal government lurches backwards on renewable energy and climate, California and other progressive states are pushing ahead, providing a model for the rest of country.
Should Texas, for example, want to take advantage of its abundant sunshine, California can show the Lone Star state how to do it.
Reposted with permission from our media associate Nexus Media.
EcoWatch Daily Newsletter
In Major Win for Indigenous Rights, Supreme Court Rules Much of Eastern Oklahoma Is Still a Reservation
Much of Eastern Oklahoma, including most of Tulsa, remains an Indian reservation, the Supreme Court ruled on Thursday.
- Federal Judge Orders Trump Admin to Give Native Americans Their ... ›
- Police Were Ready to Shoot Indigenous Pipeline Protesters in ... ›
- Climate Justice, Indigenous Rights Advocates Rally for Wet'suwet'en ... ›
By Tiffany Means
Summer and fall are great seasons to enjoy the outdoors. But if you're already spending extra time outside because of the COVID-19 pandemic, you may be out of ideas on how to make fresh-air activities feel special. Here are a few suggestions to keep both adults and children entertained and educated in the months ahead, many of which can be done from the comfort of one's home or backyard.
The coronavirus may linger in the air in crowded indoor spaces, spreading from one person to the next, the World Health Organization acknowledged on Thursday, as The New York Times reported. The announcement came just days after 239 scientists wrote a letter urging the WHO to consider that the novel coronavirus is lingering in indoor spaces and infecting people, as EcoWatch reported.
- Airborne Coronavirus Transmission Must Be Taken Seriously, 239 ... ›
- Trump Halts WHO Funding Amidst Criticism of His Own Coronavirus ... ›
- Here's Why COVID-19 Can Spread So Easily at Gyms and Fitness ... ›
- Is the New Coronavirus Airborne? A Study From China Finds Evidence ›
By Angela Nicoletti
The eastern slopes of the Andes Mountains in central Perú are among the most remote places in the world.
- Global Frog Pandemic May Become Even Deadlier as Strains ... ›
- New Species of Diamond Frog Discovered in Remote Pocket of ... ›
- Frogs Are on the Verge of Mass Extinction, Scientists Say - EcoWatch ›
A new analysis by scientists at the Swiss-based International Union for Conservation of Nature (IUCN) found that lemurs and the North Atlantic right whale are on the brink of extinction.
- Trump Admin Denies Endangered Species Protections to Pacific ... ›
- Trump Admin Failed to Protect 241 Species From Extinction ... ›
- New Border Wall Construction Threatens 8 Species With Extinction ... ›
By Julia Vergin
It is undisputed that vitamin D plays a role everywhere in the body and performs important functions. A severe vitamin D deficiency, which can occur at a level of 12 nanograms per milliliter of blood or less, leads to severe and painful bone deformations known as rickets in infants and young children and osteomalacia in adults. Unfortunately, this is where the scientific consensus ends.
Where Does the Deficiency Begin?<p>Nobody knows exactly how much vitamin D a person actually needs. The question of when a deficiency starts is correspondingly controversial. However, vitamin D is becoming increasingly popular.Not only is the pseudo-scientific literature on the "sun vitamin" experiencing an upswing, but the number of published studies has also increased enormously in recent years. For example, in 2019 <a href="https://academic.oup.com/edrv/article/40/4/1109/5126915" target="_blank">a study found that</a> Vitamin D is responsible for keeping the skeleton functional and is associated with cardiovascular diseases, type 2 diabetes and various types of cancer. <br></p>
An All-Rounder<p>Vitamin D levels in the body rise and fall according to sun exposure. If sufficient UV rays reach the skin, the body is able to produce the vitamin itself. However, the human body only derives an estimated 10 to 20 percent of its daily requirement from food.</p><p>The vitamin D that we synthesize from sunlight or food is not biologically active at first. Before the kidneys can produce the biologically active form of the vitamin, known as calcitriol, and release it into the blood, some metabolic processes must take place beforehand.</p><p>In addition, many organs have receptors to which the precursor of calcitriol binds. Further, this substance is also present in blood.</p><p>From this precursor, the organs then produce calcitriol themselves, which the body then uses for countless other processes in the body. This form of vitamin D thus regulates insulin secretion, inhibits tumor growth, and promotes the formation of red blood cells as well as the survival and activity of macrophages, which are important for the <a href="https://www.mdpi.com/2072-6643/5/7/2502/htm" target="_blank">immune system.</a></p>
Low Vitamin D, Severe COVID-19 Disease?<p>A research study carried out <a href="https://www.sciencedirect.com/science/article/pii/S2352364620300067?via%3Dihub" target="_blank">at the University of Hohenheim</a> has now established a link between vitamin D deficiency, certain previous diseases, and severe cases of COVID-19.</p><p>According to the study, "there is a lot of evidence that several non-communicable diseases (high blood pressure, diabetes, cardiovascular diseases, metabolic syndrome) are associated with low vitamin D plasma levels. These comorbidities, together with the often accompanying vitamin D deficiency, increase the risk of severe COVID-19 events."</p><p>"This statement is completely correct," said Martin Fassnacht, head of endocrinology at the University Hospital of Würzburg. However, he qualifies that it is a pure association, "i.e. a mere observation that these events occur together.</p><p>Dr. Fassnacht is very critical of the hype surrounding vitamin D, but not because he denies the vitamin serves important functions. However, studies on humans have not been able to show that vitamin D has the healing powers many often propagate.</p><p>Fassnacht says, "If you take a closer look, the hopes that the administration of vitamin D has a healing effect have not been confirmed so far."</p>
Association Versus Intervention Studies<p>Many studies on the vitamin are association or observational studies. "By definition, these studies cannot prove the causal relationship, but only point to mere correlations," said Fassnacht. The physician tries to illustrate this with an example:</p><p>"Imagine two groups of 80-year-olds. One group is spry, active and does sports. If you compare them with another group living in nursing homes, the difference in vitamin D levels will be dramatic. Life expectancy would also be extremely different."</p><p>But to try to explain the difference in fitness by vitamin D status alone is far too simplistic. "Vitamin D levels are a good measure of how sick someone is. But not more," says Fassnacht. </p><p>According to Fassnacht, none of the intervention studies carried out to date -- that specifically examined the effect of vitamin D on various diseases -- has been able to confirm the previous association and laboratory studies or the presumed positive effect of vitamin D.</p>
Further Research Is Needed<p>"If a coronavirus infection is suspected, it is therefore absolutely necessary to check the vitamin D status and quickly correct any possible deficit," said the recommendation of the paper published by the University of Hohenheim.</p><p>"Studies are underway to see whether vitamin D helps in COVID-19 infection, but I personally do not believe that this is really the case," says endocrinologist Fassnacht. Nevertheless, he says it is of course useful to carry out these studies.<br></p><p>"I don't want to rule out that there are actually subgroups of people who benefit from an additional vitamin D dose," he says. After all, this has been proven to be the case with a severe deficit.</p><p>In view of the study situation, Fassnacht does not think much of preventive, nationwide vitamin D substitutes. "My belief that the vitamin helps somewhere is very low. But, of course, I can be wrong."</p>
- 8 Ways to Tell if You Are Vitamin D Deficient - EcoWatch ›
- 7 Healthy Foods That Are High in Vitamin D - EcoWatch ›
- 7 Nutrient Deficiencies That Are Incredibly Common ›
Ocean scientists have been busy creating a global network to understand and measure changes in ocean life. The system will aggregate data from the oceans, climate and human activity to better inform sustainable marine management practices.
EcoWatch sat down with some of the scientists spearheading the collaboration to learn more.
Climate models are predicting faster warming of the North Atlantic Ocean, which will shift the Gulf Stream. NASA
- Could the Climate Crisis Spell the End for Maine Lobster? - EcoWatch ›
- 5 Reasons Why Biodiversity Matters - EcoWatch ›
- World Leaders, Media Ignore Biodiversity Report Detailing Mass ... ›
- The Top 10 Ocean Biodiversity Hotspots to Protect - EcoWatch ›