Resiliencia, embalses y regreso a la media

Este año se ha producido en España un sorprendente “regreso a la media” acelerada en el agua embalsada en los primeros meses.

Basta observar la gráfica de agua embalsada en 2018, comparada con el año pasado, el anterior y la media de los últimos 10. La pendiente de subida del año es casi perpendicular a la de 2017 y se ha alineado con la media de los últimos 10 años.

Fuente: Embalses.net

Lo curioso de este asunto es la siguiente cuestión; Sigue leyendo

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Alquilando eléctrico en Palma

Este verano he dado el salto a alquilar coche eléctrico (un BMW i3) para las vacaciones, y aquí cuento el resultado;

Cuánto más me ha costado?

100 € más de precio de alquiler para una semana. De entrada cuesta pagarlo, pero bueno… (especialmente cuando tienes una tarifa buena como la que tiene negociada mi empresa y puedo disfrutar para viajes personales…)

Ha valido la pena?

Sí, por la experiencia de conducción, la sensación de sostenibilidad, pero también económicamente;

Estos 100€ me habrían permitido rodar aprox 1000 km con la alternativa de combustible (Renault Captur).

No he rodado tanto, pero casi, porque el trayecto Aeropuerto de Palma-Costa de los Pinos lo he hecho 3 veces, además de unos 30 km diarios. La electricidad de carga me ha salido gratis porque estaba incluida en la casa de alquiler y en la carga rápida que hice 2 veces.

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Cargando en Cas Tresorer donde sólo funcionaba el molino multipala reconvertido, por lo que cargaba eólica 😉 –> (como proponen desde Amics dels Molins)

Ansiedad por quedarme sin batería? Sigue leyendo

Publication: Charging island homes

Do you think islands can benefit from the use of Electric Vehicles?

It’s quite reasonable to agree on the benefits.

Because of the limited distances, because of the availability of renewables, lack of local fuels and high energy dependence, and because of the environmental impact, electric mobility apparently fits there like a glove.

Besides, resiliency to face weather events by storing energy in the vehicle, and reducing peak electrical demand on normal conditions seem to be economically beneficial.

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Image taken in Crete by Repsaj on freeimages

The research we recently got published in Energy, focuses on the effect of using the vehicle’s energy to charge the home at peak load and charge the vehicle* during valley.

This is what we found out…

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The flight “dilemma”

As an international sales manager I have to travel within Europe and Africa regularly… This means a lot of air travel.

So, the dilemma I face is;

While I work to make SDG7 a reality by making grids smarter and greener, at the same time I have a huge carbon footprint by flights.

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I know many other people have this “flight dilemma”, do you?

This issue is also related to SDG13 (Urgent action to combat climate change).* How? Sigue leyendo

7 Terms to avoid if you need to discuss renewables

Do you find yourself discussing about Renewable Generation Technologies often?

This post can help you avoid incorrect expressions!

You might well agree that renewables are changing rapidly. Technology has not only become more competitive, but has also solved many issues or challenges that simply are not applicable today.

So, the language we use for evolving technology has to evolve too, right?

Image by Daino_16 on freeimages

Image by Daino_16 on freeimages

1. Expensive

There certainly are some expensive renewable technologies, and certainly expensive renewable projects.

But in general, Sigue leyendo

Sailing 100% renewable

You might have read an old post on electric boats and sea energy harvesting before. I described then, electrifying boat transport as one of the ways to make islands 100% renewable.

Electric sailboats have a lot of sense, and are becoming more and more popular. It’s a fantastic sensation to sail, without the sound of a motor, and for many of us, turning the diesel engine on is to be avoided as much as possible. Moreover, even when the engine is only used for a little time, we strongly feel the pollution.

Precisely because for a sailboat the engine is not used that much, having electric propulsion and battery storage is very reasonable. It can be charged at the normal port outlet, regenerating while sailing, or with a small wind generator and solar panels. Compared to the need of refueling at a port gas-station, the convenience is increased greatly, and also the cost to the owner.

Maintenance of an electric motor is simpler because of less moving parts, the size of the motor is reduced, and the battery can be placed as ballast, incorporated in the hull. Sailboats already have batteries and often the motors have to run just to charge them. By increasing the size of the batteries and having renewable charging (solar/wind), this is automatically taken care of.

Besides, the performance is increased, having more torque at lower rpm, and electric motors are more efficient that the internal combustion counterparts.

Finally, regarding the noise, see this video comparing the diesel engines to electric. Together with the smoke/pollution, this is the most dramatic difference.

In summary, it will amaze me if in 5 or ten years all 95% of all new sailboats are electric. And I hope to sail on one of those soon.

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Sunset near Cala D’Or in Mallorca

If Energythaca were an island, sailing there would be on a sailboat. That was the image on my first post on the blog.

I guess it is an appropriate post arriving from vacations…

“Baseload” is an obsolete pre-energy-transition concept?

“Baseload” is so much twentieth century… It is a concept widely used when demand was not flexible. When there was an uncontrollable consumption and industries were not adapting their production to availability of abundant energy. When the goal was to have nuclear and other conventional power plants running 24/7.

In the twenty-first century, the demand curve is not going to be flat, but is going to be variable and smartly adapted to supply of renewable energy.

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The “base load” game. Image from Maria Yan (Yanovski-55776) on freeimages.com

Let’s look at the energy demand to challenge this concept…

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