Hi Chee,
First off, if the tenant is actually paying the rent, then why would you try to mess with that even if you have a technical ability in the contract? How late are they with the rent? If it is a few days, my advice is learn to live flexibly and let it be. If it's a few weeks and you're not happy about their excuses, then see if the eviction notice is what you would like to do.
Anyway, as far as electricity bills are concerned, there's no real issue in that area since TN allows the bill to go to a 1000 ringgits before taking any action. I myself don't pay them except every 3 to 4 months.
As for your clause, I have noticed that one before in other drafts. I believe it is a mis-copied clause with a fatal error -in my opinion-: \"shall absolutely determine\" is not an effective term to communicate without a doubt that the tenancy contract is null and void. The clause gives you right to \"re-enter\" the premises, but does not terminate the agreement. All in all, yes you can tell them to leave, but they can simply say \"no\". You'll still have to go through the whole eviction process I believe.
Check with a lawyer on this one.