Do not cut electricity connection it is may leads to a criminal case,rather you may take legal recourse.
As per provision of West Bengal Premises Tenancy act landlord can evict the tenant on the following grounds:---
1. When the contract expires and is not renewed , tenants should vacate within a month .
2. If a tenant dies, his direct legal heirs living with him or dependent on him can stay on only for five years .
3. Landlord can evict tenant for his own accommodation . Landlord can claim immediate possession if he is a retired government employee of an ex-serviceman .
4. A tenant can be evicted if he fails to pay rent for three months in a year.
5. Subletting or immoral use of premises will invite eviction .
So,you can send a Legal Notice to the Tenant calling him to quit and vacate the rented room for your own use,if he would not comply then file a Suit for Eviction in Civil Court on reasonable requirement ground,but it is lengthy process of laws.