Hello nda, this is some advice from me:
Since November 2016,
the capital city of Papua, Jayapura,Jayapura, the capital city of Papua, has experienced (...) because they only SOLELY had electricity storage ...
1. In general, if you read many essay or article in English, you must mention the information before add some details that support your main information.
Jayapura ---> the main information
the capital city of Papua ---> details.
2. Only ----> A1 Word (too common). So, i recommend to change into "Solely" (uncommon) ---> C1 words to boost your IELTS Score.
Keep hard work !