upgrade to a 200 amp service, cable wiring sizes
For a 200A residential service in the US or Cananda typical would be 4/0-4/0-2/0AL or 2/0-2/0-1/0CU conductors. Either combination would normally be run in 2" conduit.

This is only scratching the surface of what you need to know to do this project. Are you aware and knowledgeable of all the other requirements/codes/etc???