power, more efficient offshore wind, and with every one of these turbines that goes out, you re saving about 52,000 metric tons of c02, which is like taking 11,000 vehicles off the road. wow, that is pretty, pretty impressive. henry, look, i want to turn back to solar for a second. perovskite is the material you ve been working on. what is it, how does it work, and why is it such an improvement and such a possibility for the revolution of solar power? perovskite is a crystal structure. one of the unique aspects of them is because they re composed of three different ions, we can actually change the composition of these ions and that changes the optical properties and electronic properties of this material. this means that instead of using a single material to absorb the sunlight, we can actually tune the perovskite to absorb in different regions and stack these materials on top of each other. now, this stacking of solar cells on top of each other we call multi junctions, and the simples
solutions that are good for the individual, but the biggest challenge ahead of us isn t technology, it s public acceptance. it s support for improved permitting and collaboration on changes to ensure that migration patterns for birds are known and we don t site wind turbines in those areas or wind farms in that space. but there can tjust be a wholesale rejection of this technology because of the threat of something that would be negative. that collaboration is the real opportunity for us to work together. so it s a partnership, really, it s you delivering the technologies that make the future possible, and us adopting them and making the right choices to protect us from this growing threat. thank you so much. we re going to move to questions now. this is the engineers: clean energy. we ve been discussing the future of solar energy, wind power and electrical storage, and i m going to ask who would like to ask a question of any of our clean energy engineers.
and reliability of our grid and reduces the total amount of capacity that we need to have installed, because we re seeing variation that we can tap into if the sun is not shining here, the wind is blowing there. if it s very hot and sunny here, you ve got hydropower or wind power in another region. connecting us will be a very big part of that. the second part that s quite related is demand response. so how can those who are transmitting and distributing this electricity get signals back from industry or homes that they can, without the user noticing, reduce the load, either change the turn off the defrost cycle of the freezer for 15 minutes, not even noticeable. 0r reduce the temperature of a cooling. these are the types of responses that we are going to have to get used to, it s not central hub and spoke, we re all part of this new electrical system together and having us connected
now, danielle, i want to come back to you to hear about your latest prototype wind turbine, the haliade x, unveiled in 2019. it is a monster of a machine, this thing. and i want you to describe for me its scale and efficiency, and how you get it to work. so, the haliade x is the world s most powerful wind turbine in operation today. it s offshore, it has a iii megawatt capacity, and the rotor so, the distance from blade tip to blade tip is 220 metres. so each blade is longer than the wingspan of the largest aircraft in the world. each spin of one of those blades can power a typical household for more than two days. so, a typical wind farm can power about a million households. and so this is incredibly important in terms of being able to move to more wind
important in terms of being able to move to more wind power, more efficient offshore wind, and with every one of these turbines that goes out, you re saving about 52,000 metric tons of c02, which is like taking 11,000 vehicles off the road. wow, that is pretty, pretty impressive. henry, look, i want to turn back to solar for a second. perovskite is the material you ve been working on. what is it, how does it work, and why is it such an improvement and such a possibility for the revolution of solar power? perovskite is a crystal structure. one of the unique aspects of them is because they re composed of three different ions, we can actually change the composition of these ions and that changes the optical properties and electronic properties of this material. this means instead of using a single material to absorb the sunlight, we can actually tune the perovskite to absorb in different regions and stack these materials on top of each other. now, this stacking of solar