I think those are different.. 'The streets are going to be repaired this month' = The streets will be repaired this month *In fact, The streets have been done nothing
'The streets are being repaired this month' = The workers are repairing the streets.
Thank you, Aru and Anonymous. So it's the same as 'The book is being read by me'- I started reading it and I may or may not be reading it right now. What do you both think?
If you say it on the first of the month, the two sentences mean the same thing. Both refer to a future activity. We frequently use the present progressive to mean a future event, and we need context to determine whether it's ongoing now, or will take place in the future.
The "are going to be" will always mean that something will happen in the future.