In the US, I think that it is on NBCSN Gold, which is an extra $ subscription. Previous years had the TdF on NBCSN (not Gold, so no extra $, I thought), but Saturday at least, the only things on that channel were football/soccer - no virtual TdF (but I didn't check today).
EDIT to emphasize no 'gold' for TdF in previous years
EDIT to emphasize no 'gold' for TdF in previous years