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Renewable energy In Saturday I visited lecture on renewable energy (RE). I've known many facts. The most promising sources of renewable energy are wind and sun. In recent years the solar panels have become much cheaper and more profitable. Though there are many problems associated with using RE: low effiency, high construction cost, impermanence. The solar panels don't work at night and wind turbines don't work during the calm. The many countries in Europe use renewable energy. In Russia solar panels are used in hard to reach settlements, when it's difficult to build power line from station. There are many nuclear power plants in Russia, this is due to the large area of the country. However, modern nuclear power plants are much more safety than before. In my opinion, in the future all the humanity will use "green energy".

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Renewable Energy

On Saturday I attended a lecture on renewable energy (RE). I learned many facts. The most promising sources of renewable energy are wind and sun. In recent years the solar panels have become much cheaper and more profitable. Though there are many problems associated with using RE: low effiency, high construction cost and impermanence. The solar panels don't work at night and wind turbines don't work during the calm.
The many countries in Europe use renewable energy. In Russia solar panels are used in hard to reach settlements, when it's difficult to build power lines from the stations. There are many nuclear power plants in Russia, this is due to the large area of the country. However, modern nuclear power plants are much safer than before.
In my opinion, in the future all of humanity will use "green energy".

Although and however. The rules you have been told about are not hard and fast rules. 

The various dictionaries and sources I referred to. To check my memory, say we "usually" follow the rules in the links below.

Usually does not mean it is a necessity. 

https://dictionary.cambridge.org/grammar/british-grammar/although-or-though

https://english.stackexchange.com/questions/113104/use-of-though-versus-however

https://www.ecenglish.com/learnenglish/lessons/4-ways-use-though

https://www.kaplaninternational.com/blog/however-vs-although-quick-english

If you read the red link and the blue link you will see the way you have used although is correct. Because both parts of your two sentence clauses remain "TRUE". And you have a comma after although. It does not have to come after the word although. 

I guess this is going to be another case where teachers do not agree ! :)






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Renewable energy

In  On Saturday I visited attended a lecture on renewable energy (RE).  at 8:00, in the morning, on Saturday, in November// visit a place; attend an event  I've known I learned many facts. Use "learn" when you change from not knowing something to knowing it.  Since we know WHEN you learned it (at the lecture on Saturday), use past simple, not present perfect.  The most promising sources of renewable energy are wind and sun. In recent years,  the solar panels have become much cheaper and more profitable. Though However, there are many problems associated with using RE: low effiency, high construction cost, impermanence. "Though" is a conjunction: it connects two halves of a sentence across a comma; "however" is a conjunctive adverb: it connects 2 sentences across a period or semicolon. The solar panels don't work at night and wind turbines don't work during the calm.  when the air is calm.
The mMany countries in Europe use renewable energy. In Russia, solar panels are used in hard to reach settlements, when where it's difficult to build power lines from a station. There are many nuclear power plants in Russia, which is due to the large area of the country. However, modern nuclear power plants are much safer than before.
In my opinion, in the future all the humanity will use "green energy".
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Renewable energy

On Saturday, I attended a lecture on renewable energy (RE). I've known many facts regarding the topic. The most promising sources of renewable energy are wind and the Sun. In recent years, the solar panels have become much cheaper and more profitable. Nevertheless, there are still many problems associated with using RE: low effiency, high construction cost, impermanence. Moreover, the solar panels don't work at night and wind turbines don't work during the calm?
Many countries in Europe use renewable energy. In Russia, solar panels are used in hard to reach settlements, when it's difficult to build power line from a station. There are many nuclear power plants in Russia. This is due to the large surface of the country. However, modern nuclear power plants are much safer than before.
In my opinion, in the future all humanity will use "green energy".
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Renewable Energy.

 There are many problems associated with using RE: low effiency, high construction cost and impermanence. However, The solar panels don't work at night and wind turbines don't work during the calm. (but they don't work at night or during the calm)

 There are many problems associated with using RE: low efficiency, high construction cost and impermanence . Although RE systems don't work at night, or during the calm. They are greener and useful in isolated places (they are useful in isolated places and greener).

Simple way to say same thing. 

 There are many problems associated with using RE: low effiency, high construction cost and impermanence. The solar panels don't work at night and wind turbines don't work during the calm. 

There are many problems associated with using RE: low efficiency, high construction cost and impermanence . They  don't work at night, or during the calm. But they are greener and useful in isolated places




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