From what I hear, UC SAn Diego brags that they give you so much EMG training, that you are ready to go.
I am not sure exactly what is required, from what I understand, there is nothing to stop a healthcare provider (any specialty, remember, PM&R does these too without fellowship), from doing EMG and claiming reimbursement if they feel comfortable doing so. So really, there is nothing legally stopping you from performing EMG's in your office outpatient and claiming reimbursement.
My experience, take it for what is worth, is that your interpretations will never be taken seriously by other providers who are fellowship trained. I know for a fact that most PM&R programs actually do more EMG's in their residency than neurology residents, yet I have seen several patient go to an EMG fellowship trained neurologist for a referral carrying an EMG report done by a physiatrist and the neurologist pretty much throws it in the trash and does their own study.