Hi ​@Tee1 , you will need to set up your own account (if not already done) as the previous tenant has probably sent a final reading for their usage. You will also have daily standing charges to account for.
There’s a guide here 

Hey ​@Tee1,

Have you received the keys for the property? If so, you are now liable for any energy usage. As ​@BPLightlog mentioned, daily standing charges are applied and likely caused the balance to fall. More information can be found in the guide provided and i’ve left more information below:

What is a standing charge?
 

A standing charge is a daily fixed charge that goes towards the cost of supplying energy to your address. It includes the cost of the pipes and power lines, and maintenance of your meters. You pay your standing charge no matter how much energy you use – even if you have a smart meter.

Why do OVO plans include a standing charge? 
 

Because we use a standing charge, we don’t have to use structured unit prices like other suppliers do. We believe our way is honest, transparent and much simpler.

How do other suppliers cover this maintenance cost if they don’t use a standing charge?

All suppliers have to contribute towards these maintenance cost so it’s likely they will include this as part of your unit rate (which might be higher).

Obviously the impact of a standing charge cost will differ depending on whether you’re a high or low energy user. If you’re comparing plans we’d advise finding out your Estimated Annual Consumption (EAC) figure and entering these under the ‘Do you know how much you use?’ question on our Quote and Switch page.

There’s more details on understanding energy tariffs on this great guide.

Hello. I want to register a new electricity account for my house. How should I do that? Thanks.
 

Are you moving in as a new owner or tenant?

Or are you wanting to switch supplier?

The articles here should tell you how to go about either one; but please come back if you can't find your answer there:

https://forum.ovoenergy.com/moving-home-joining-or-leaving-175

Hey ​@Jinling,

Just to confirm, have you recently bought or moved into a new home & want to register your name with the energy supplier?

If so, Chris & Nukecad have porvided helpful links here. Or do you refer with regisering a new electricity supply with your current home? In which case, this topic might be helpful:
 

Let us know if you have any further questions 
 

Is there any way to register online.My English is not very good.Thanks 

Hey ​@Jinling,

You will need to call OVO, but we do have the option of language line. If we receive a call from a customer whose first language isn't English, we can offer a translator through LanguageLine.
 

Setting up an OVO account

Decided to fix in to an OVO plan or switch to another supplier? Either way we’ll need to set you up an OVO account. 

Even if you’re planning a next day switch, setting up an account with OVO can help the switch progress smoothly and be sure you’ll receive an accurate statement covering the time between your move-in and your switch away.

If your new home is supplied by OVO, you can call our Support Team on 0330 303 5063, we’re open Monday- Friday 9am to 5pm. Or, if you’d prefer to do it all online you can sign up here. 

Once you put in your new address details the website will recognise we already supply your new home and give you a quote based on the usage figures we have for the property. 
 

​@Emmanuelle_OVO This is the first I’ve heard of OVO’s LanguageLine offering. You say specifically that the BSL service is free; does that mean that LanguageLine interpreting isn’t?

A search of the Help pages produced nothing at all ...

What number should I call to get an interpreter?

You can call the regular number. The agent should be able to get an interpreter on the call if needed.

it is this number 03303035063

No. For PAYG it’d be 0330 175 9669 per:

Hey ​@Firedog & ​@Blastoise186, 

On the article below that I made about the PSR customers can get help if they’re unable to speak English and are needing support.

​@Jinling would just call us using the Pay as you Go contact number shown above 0330 175 9669 and ask for an interpreter and one would be provided free of charge.