Is it legal for property companies to overcharge electricity?

It is illegal for a property company to overcharge electricity. If the property price increases, you can bring a lawsuit to the people's court.

Article 44 of the Property Management Regulations:

Within the property management area, water supply, power supply, gas supply, heating, communication, cable TV and other units shall charge relevant fees to the end users.

The realty service enterprise shall not charge additional fees such as handling fees to the owners if it accepts the entrusted collection of money.

Extended information "Property Management Regulations":

Article 40

Property service charges should follow the principles of rationality, openness and adaptability between fees and service levels, and distinguish the nature and characteristics of different properties. The owners and the realty service enterprise shall, according to the charging standards for realty service formulated by the competent price department of the State Council in conjunction with the administrative department of construction of the State Council, stipulate in the realty service contract.

Article 41

The owner shall pay the property service fee in accordance with the provisions of the property service contract. If the owner and the user of the property agree that the user of the property shall pay the property service fee, the owner shall bear joint and several liability from the agreement. Property that has been completed but has not been sold or handed over to the property buyer shall be paid by the construction unit.

Baidu Encyclopedia-Property Management Regulations