Landlord taking extra electricity charge from tenant

There is no law under which you can be proptected. A landlord can ask you to vacate the premises. Going to court etc. will be difficult. As you are a law student you may be knowing many senior lawyers. You can consult them. Is there a tenancy agreement with the landlord? What does it say?

Let the tenant issue a legal demand notice to the landlord demanding the excess electricity charges he had received from the tenant till this date.

If the landlord is forcing her to vacate, she can file a suit for injunciton to restrain the landlord from forcibly evicting her other than by due process of law.

When a landlord charges for electrical energy from a tenant, it need not necessarily be limited to the energy consumption. The landlord has spent money to install and maintain the electrical system. He has to recover that also from the user. Whether the capital cost and maintenance of the electrical system are included in the rent paid can be disputable. What are the electrical appliances such as light bulbs, fans and others provided by the landlord at his cost?  The landlord is buying electricity from the Electricity Board and selling it to the tenant. There is no law that he should sell it at cost. He can include his service charges and propfit. That is why that I said that there is no law in this case. You can go to court and try your luck.