Spain and France Ready HVDC Connection

Could it improve prospects for stalled desalination plants in Catalonia?

1 min read
Spain and France Ready HVDC Connection

Siemens is building power converter stations for a 2000 MW high-voltage, direct-current underground transmission line that will connect France's Languedoc and Spain's Catalonia, regions that have deep cultural and linguistic ties but are separated by the Pyrenees The record-capacity, 65-kilometer-long cables are to come into operation in two years and will carry current at 320 kilovolts.

"The centerpiece of the HVDC Plus power converter stations," says Siemens, "is a converter based on IGBT (insulated gate bipolar transistors) which transforms the alternating current into direct-current and back again. By contrast with grid-commutated power converter technology, the HVDC Plus system works with turn-off power semiconductors, so that the commutation processes in the power converter are completely independent of the grid voltage. Very fast control and protective intervention in the power converter makes for a highly dynamic system, which is essential especially for coping with grid faults and disturbance in the three-phase ac network."

As northeastern Spain is more tightly linked to the European grid system,  could electricity prices drop and prospects improve for desalination plants built in Catalonia? Right now a partially built 300-million-euro plant at Torrevieja is sitting idle, without electricity or seawater access, as regional and national authorities feud about its advisability and costs. Wherever such plants are proposed, water and energy needs tend to collide. Tiny Malta gets 40 percent of its freshwater from desalination plants, and Jordan (photo above)--relying on a intelligent water management systems--has plans to move in a similar direction.

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Here’s How We Could Brighten Clouds to Cool the Earth

"Ship tracks" over the ocean reveal a new strategy to fight climate change

12 min read
Silver and blue equipment in the bottom left. A large white spray comes from a nozzle at the center end.

An effervescent nozzle sprays tiny droplets of saltwater inside the team's testing tent.

Kate Murphy

As we confront the enormous challenge of climate change, we should take inspiration from even the most unlikely sources. Take, for example, the tens of thousands of fossil-fueled ships that chug across the ocean, spewing plumes of pollutants that contribute to acid rain, ozone depletion, respiratory ailments, and global warming.

The particles produced by these ship emissions can also create brighter clouds, which in turn can produce a cooling effect via processes that occur naturally in our atmosphere. What if we could achieve this cooling effect without simultaneously releasing the greenhouse gases and toxic pollutants that ships emit? That's the question the Marine Cloud Brightening (MCB) Project intends to answer.

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