Every time a ternary graph gets posted here, it causes a lot of confusion. They're pretty common in some fields of science (e.g., soil composition, phase-change chemistry), and it's a good exercise to learn how to read one, because then you'll know how to read them all.
Now, look at a particular axis - it has a label and some numbers, but it also has little tick marks. The direction of the tick mark shows you which line to follow. For example, check out 40% fossil fuels; the tick points right, so you follow the line toward Ukraine, UK, and Germany. Thus, all of those countries use about 40% fossil fuels. You may be tempted to follow the line toward France instead, but the tick mark is facing the wrong way, telling you not to go that direction.
To fully characterize a country, you need three values. So, for the UK, we already know it's 40% fossil. It sits on a line that runs from the 80% fossil to 20% nuclear labels, but only the latter has a tick mark along the line that our flag is on. Thus, we know it's 20% nuclear. The last line it sits on runs from 40% renewable to 60% nuclear; the renewables tick mark is hidden by China's giant flag, but if you check the others on that axis, they are parallel to our line, while the one on the nuclear axis is not. So, 40% renewables is the answer there. You can always check your results by ensuring that the values add to 100%.
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Every time a ternary graph gets posted here, it causes a lot of confusion. They're pretty common in some fields of science (e.g., soil composition, phase-change chemistry), and it's a good exercise to learn how to read one, because then you'll know how to read them all.
Now, look at a particular axis - it has a label and some numbers, but it also has little tick marks. The direction of the tick mark shows you which line to follow. For example, check out 40% fossil fuels; the tick points right, so you follow the line toward Ukraine, UK, and Germany. Thus, all of those countries use about 40% fossil fuels. You may be tempted to follow the line toward France instead, but the tick mark is facing the wrong way, telling you not to go that direction.
To fully characterize a country, you need three values. So, for the UK, we already know it's 40% fossil. It sits on a line that runs from the 80% fossil to 20% nuclear labels, but only the latter has a tick mark along the line that our flag is on. Thus, we know it's 20% nuclear. The last line it sits on runs from 40% renewable to 60% nuclear; the renewables tick mark is hidden by China's giant flag, but if you check the others on that axis, they are parallel to our line, while the one on the nuclear axis is not. So, 40% renewables is the answer there. You can always check your results by ensuring that the values add to 100%.
Fuente: https://www.reddit.com/r/dataisbeautiful/comments/pb7qfd/oc_electricity_generation_by_source_for_different/haa0vpm?utm_source=share&utm_medium=web2x&context=3