Even as Donald Trump boosts coal over clean energy, solar power is hitting new milestones in the U.S. and remains the leading source of new power. Data released Wednesday by global energy think tank Ember, along with a report by the Solar Energy Industries Association and analytics firm Wood Mackenzie, show the continued growth of solar and decline of coal in the United States despite federal policy. In May, for the first time, solar supplied more of the nation’s electricity than coal, or 12.8%, Ember said. Coal supplied 12.2%, its fourth-lowest monthly share ever…….continue reading….
Source: PBS News
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Concentrated solar power (CSP), also called “concentrated solar thermal”, uses lenses or mirrors and tracking systems to concentrate sunlight, then uses the resulting heat to generate electricity from conventional steam-driven turbines. As of 2021 the levelized cost of electricity from CSP is over twice that of PV. As of 2022, less than 1% of solar power comes from CSP.
A hybrid system combines solar with energy storage or one or more other forms of generation. Hydro, wind and batteries are commonly combined with solar. The combined generation may enable the system to vary power output with demand, or at least smooth the solar power fluctuation. There is much hydro worldwide, and adding solar panels on or around existing hydro reservoirs is particularly useful, because hydro is usually more flexible than wind and cheaper at scale than batteries, and existing power lines can sometimes be used.
Solar-cell efficiencies of laboratory-scale devices using these materials have increased from 3.8% in 2009 to 27% in 2025 in single-junction architectures, and, in silicon-based tandem cells, to 34.85%, exceeding the maximum efficiency achieved in single-junction silicon solar cells. Perovskite solar cells have therefore been the fastest-advancing solar technology as of 2016. With the potential of achieving even higher efficiencies and very low production costs, perovskite solar cells have become commercially attractive.
Core problems and research subjects include their long-term stability, high sensitivity to moisture, and toxicity if lead is used. Managing toxic lead in PSCs is essential, as exposure presents significant health risks, including neurological disorders. Because PSCs are an emerging technology, lead toxicity remains a major hurdle to widespread adoption and commercialization. The photovoltaic effect in solar cells converts light into electric current. The first solar cell was constructed by Charles Fritts in the 1880s.
The German industrialist Ernst Werner von Siemens was among those who recognized the importance of this discovery. In 1931, the German engineer Bruno Lange developed a photo cell using silver selenide in place of copper oxide, although the prototype selenium cells converted less than 1% of incident light into electricity. Following the work of Russell Ohl in the 1940s, researchers Gerald Pearson, Calvin Fuller and Daryl Chapin created the silicon solar cell in 1954.
These early solar cells cost US$286/watt and reached efficiencies of 4.5–6%.[21] In 1957, Mohamed M. Atalla developed the process of silicon surface passivation by thermal oxidation at Bell Labs. The surface passivation process has since been critical to solar cell efficiency. As of 2022 over 90% of the market is crystalline silicon. The array of a photovoltaic system, or PV system, produces direct current (DC) power which fluctuates with the sunlight’s intensity.
For practical use this usually requires conversion to alternating current (AC), through the use of inverters. Multiple solar cells are connected inside panels. Panels are wired together to form arrays, then tied to an inverter, which produces power at the desired voltage, and for AC, the desired frequency/phase. Many residential PV systems are connected to the grid when available, especially in developed countries with large markets.
In these grid-connected PV systems energy storage is optional. In certain applications such as satellites, lighthouses, or in developing countries, batteries or additional power generators are often added as back-ups. Such stand-alone power systems permit operations at night and at other times of limited sunlight. In a “vertical agrivoltaics” system, solar cells are oriented vertically on farmland, to allow the land to both grow crops and generate renewable energy. Other configurations include floating solar farms, placing solar canopies over parking lots, and rooftop solar.
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