$200 rent increase w/o notice, forced utilities?? (ON:Canada)?

If a new landlord (just bought the place) said he'd be charging $200 more in rent, than what the tenant had been paying (to the other landlord) and that the tenant would have to get hydro switched into his/her name asap...is this legal? justified? what are the policies and legalities surrounding this situation. The rent was increased no more than a couple weeks before the rent was due, and insinuated an eviction if the new rent could not be met (the new landlord wanted to rent the apt to his son). Does this count as a threat? ...if the tenant obliged and followed through with the new terms for 4-5 months, can anything be done about it now? or is it too late? if anything can be done, what would that be? There are also many maintenance issues with the unit that the landlord has decided to disregard or promise to fix in the future, and then nothing happens. The apartment is certainly not worth what the landlord is charging in rent.