surplus

Record renewable energy in Scotland

March 1, 2024 By EarthWise Leave a Comment

The Scottish government recently announced that in 2022, renewable technologies in that country produced the equivalent of 113% of Scotland’s electricity consumption.

Fossil fuels still supplied electricity in Scotland, helping to fill in gaps in renewable power, but the government figures showed that the growing amount of Scottish renewable generation can easily generate more power than the country uses. Scotland has seen significant growth in wind power as well as a small drop in overall electricity consumption.

Scotland, with a population of only 5.5 million, aims to produce enough renewable power to both meet its own demand and export clean electricity to other countries. The U.K. is the obvious potential customer, but it will need to upgrade its national power grid and develop enough capacity to store up surplus wind and solar power.

The U.K. itself is drawing less power from natural gas and coal than it has at any point in the last 66 years. Fossil fuels supplied only 33% of British electricity in 2023 while renewables supplied 43%.

Fossil power use in Britain peaked in 2008. Since then, power from natural gas has fallen nearly in half while coal power has dropped by 97%. The U.K. has aggressive decarbonization goals in place, but the current Conservative government under Prime Minister Sunak has recently set about weakening British climate policy.

Meanwhile, the Scottish government is talking about becoming a global renewables powerhouse and is making investments aimed at achieving it.

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Record renewable energy output

Photo, posted July 21, 2010, courtesy of Martin Abegglen via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio

Removing Lead From Water With Beer Yeast | Earth Wise

July 14, 2022 By EarthWise Leave a Comment

Lead and other heavy metals in water are a serious global problem that is worsening because of electronic waste and discharges from mining operations. In the U.S., over 12,000 miles of waterways are impacted by mine-drainage water that is rich in heavy metals.

Lead in particular is highly toxic, especially to children. The European Union established a standard for allowable lead in drinking water of only 5 parts per billion. In the US, the EPA has declared that no level of lead at all is safe.

Researchers at MIT have recently discovered that inactive yeast can be effective as an inexpensive, abundant, and simple material for removing lead contamination from drinking water supplies. The MIT study shows that the method works even at parts-per-billion levels of contamination.

The method is called biosorption, in which inactive biological material is used to remove heavy metals from water. Previously, it has been studied at parts-per-million contaminant levels, but the MIT study shows that it works at much lower levels as well.

The team studied a type of yeast widely used in brewing. The yeast cells used are inactive and desiccated and require no special care. Such yeast is abundantly available as a waste product from beer brewing and various other fermentation-based industrial processes.

The researchers estimate that to clean a water supply for a city the size of Boston would require about 20 tons of yeast a day, or 7,000 tons a year. That seems like a lot, but one single brewery, the Boston Beer Company, generates 20,000 tons a year of surplus yeast that is no longer useful for fermentation.

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Could used beer yeast be the solution to heavy metal contamination in water?

Photo, posted September 5, 2017, courtesy of Allagash Brewing via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

Offshore Wind In Europe

November 28, 2016 By WAMC WEB

The U.S. has just turned on its first offshore wind farm off the coast of Rhode Island. In the meantime, offshore wind continues to grow by leaps and bounds in Europe. Wind energy in the European Union accounts for 12% of its electricity supply. Until 2011, offshore wind comprised only 5-10% of the newly-installed wind energy capacity; now it about one third of the new installations.

A Water Superpower

September 23, 2016 By WAMC WEB

In 2008, Israel was on the verge of catastrophe. A decade-long drought in the Fertile Crescent of the Middle East was scorching the area. Israel’s largest source of fresh water, the Sea of Galilee, had dropped to within inches of the so-called black line at which point irreversible salt infiltration would flood the lake and ruin it forever.

[Read more…] about A Water Superpower

A Solar Airport

September 1, 2016 By WAMC WEB

Cochin International Airport in southern India is the seventh busiest airport in the country. Its managers were fed up with the facility’s large electric bills and decided to take matters in their own hands.

[Read more…] about A Solar Airport

Storing Energy With Rocks

June 2, 2016 By WAMC WEB

Energy storage is hot topic because more and more electricity is being generated from renewable sources like solar power and wind power that can’t operate all the time because the sun doesn’t always shine and the wind doesn’t always blow. So we need ways to store surplus energy when it is produced and be able to use it later when it is needed.