Next, I will speak about solar energy. Solar, of course, there is a lot of sun. We know that the sun is a very powerful source of energy. So how can we exploit the sun? There are three major ways of exploiting solar energy. One is thermal solar, which consists very simply in creating units that are essentially boxes painted black to absorb more of the sun's light. You'll have some coils of tubes in the box. There is water running through these tubes or oil if you wish. It gets hot because of the sunlight and this will be sufficient as a source of heat for providing sanitary water, and also, perhaps for contributing if not being sufficient for heating your home. This is very frequent in some, for example, parts of the Mediterranean in Greece or Israel. This is rather ubiquitous way of utilizing the sun. It's very simple. The technology is extremely simple. You can probably manufacture yourself a solar unit in your home. But it's effective, and so we can expect that more of this will be used in different environments. Of course, if it's not homemade, it can be more efficient. Then, we can speak of utilizing solar energy to produce electricity, and that can be done in two major ways. The first one is photovoltaics and the second one is concentrated solar power. Photovoltaics implies the use of panels that are composed of silicon crystals. The silicon crystals, when exposed to the light, generate an electric current. So each panel has a limited capacity, but you can multiply the panels, occupy large surfaces of land with multiple panels, and then the capacity is added and the total capacity becomes significant. You have installations of this kind in some European countries, and you have installations of this kind also in countries that have large desert areas where you can easily install large number of photovoltaic panels without encroaching on agriculture. This is the case, for example, of Chile or some of the desert countries in North Africa and the Middle East. But there, this is not too frequent. The other alternative, the other major technology to produce electricity out of solar is concentrated solar power. Concentrated solar power implies using mirrors to reflect the light towards a target. The target becomes very hot and allows you to raise steam and produce electricity. Now, I should say that there is a major difference between photovoltaic and concentrated solar power. This is, a photovoltaic panel will produce electricity when there is light. Even if there is no direct sunlight, sun rays do not heat the panel directly. For example, it's a cloudy day or it's a misty day, as the sun does not quite reach the panel directly, the panel will produce some light. But when it is dark, the sun sets. If it's night, then it stops producing any electricity completely. In contrast, a concentrated solar power plant requires clear skies and direct sunlight. It must be directional because otherwise it's not reflected efficiently by the mirrors. So you have this requirement of directional sunlight. At the same time, the liquid or the material that is in the target which is heated at very high temperature, it's normally not water, it can be an oil or even some cases, salt that melts under the high temperature that is reached in the vessel that contains it. Then, this will stay hot for several hours after the irradiation, the light of the sun ceases to be available. So with a concentrated solar power plant, it is possible to produce electricity for several hours after sundown, several hours into the night. This is important, because the consumption of electricity reaches a peak normally in the hours that immediately precede or follow sundown. So it then decreases rather rapidly after midnight or one o'clock in the morning. So the ability of a concentrated solar power plant to produce electricity after the sun has set beyond the horizon is something that is important. There are two main kinds of concentrated solar power plant. One is the so-called central tower in which you have a field of mirrors. These are flat mirrors. They are not too expensive to produce, and they are mounted on moving supports so that they will change inclination depending on the movement of the sun. They concentrate the light on the top of a central tower where you have a reservoir that contains the oil or the salt that accumulates the heat. This reservoir then is put in touch with water, the water boils, the steam is collected and passed through a turbine and you produce electricity. The other alternative is the so-called parabolic troughs. Here, you have an array, a line of mirrors, but these are not flat. They are parabolic, and so they will collect the light and reflect it to a central point, which is a tube that is located in the focus of the parabola, and this tube reaches very high temperature. There again, you have some kind of liquid that will allow you to capture the heat, transfer it to water, produce steam, and produce electricity. The largest concentrated solar power plant in the world is being built in Ouarzazate in Morocco. That will be a fairly sizable plant, a significant size plant of 500 megawatts. The construction of it has started only in 2013, so it is ongoing and it will take quite some time before it is available.