"It is reliable form of energy"
You should add a determiner: "It is a reliable form of energy" to improve your coherence and correct your grammar
"Today Lithuania has 68 wind turbines and the biggest part of them are in West part of my country, because there is the strongest wind"
'Part' isn't the right word to describe the wind turbines, though you could use 'partition' or "...and most of them are in the West part...."
Make sure to also include the determiner 'the', before 'West' for coherence
I would rewrite that sentence as: "Today, Lithuania has 68 wind turbines and most of them are in the West part of my country, because there are stronger winds here."
If you want to use 'strongest', you need to give more information about the 'strongest winds'. Eg: "Because the strongest winds occur in the West of my Country."
"Wind power supplying as much as 1% of Lithuania’s electricity demands."
This is a fragmented sentence; You need to have a subject, verb and an object in your sentence. Even though you wrote 'supplying' (which may seem like a verb to non-native English speakers), this word is an Adverb (usually denoted by the -ly ending) and adverbs describe verbs
There are no verbs in your sentence, so hence it is a grammatical error
You could write something like: "Wind power supplies as much as 1% of Lithuania's electricity demands."
"...I think government..."
A 'Government' refers to the current political party in your country, and does not hold an equal value in meaning as it does for a person - ie, you can say 'I think James...' or 'I think he...' but not 'I think Government...' because there are many people in a 'Government' and you want to refer to the current Government in your country, so...
When you refer to 'Government', you need to write the determiner: 'The' before 'Government'. "I think the Government..."
That is all I can suggest, the rest are small and very minor coherence errors, and shouldn't matter as much
-Keine