Whom should I sign an agreement for electricity supply to my apartment in a new residential building?

After a multi-apartment residential building has been commissioned and ownership of an apartment has been registered, the electricity supply arrangements must be properly formalized.
For household electricity consumption, a contract is concluded with an electricity supply organization. The procedure depends on whether the property is being connected to the electricity grid for the first time or the apartment is changing ownership.
This guide explains where to apply, which documents may be required, and how electricity bills are paid.