This petition was rejected

The Government e-Petitions Team gave the following reason:

We understand that you are concerned about the profits that some companies are making and the impact of high costs on people. However, we're not exactly sure how you'd want a cap on profits to work, or what that cap should be.

You could start a new petition explaining what you'd like to happen. For example, you could start a petition asking the UK Government to increase its current energy profits tax to a certain level, if that's something that you'd like to see.

You may also wish to sign this petition calling for energy companies to be nationalised: petition.parliament.uk/petitions/621719 or this petition calling for a not-for-profit state owned energy provider to be created: petition.parliament.uk/petitions/617446

You may be interested to know that the current energy price cap sets a maximum that suppliers can charge per unit of energy, and caps the level of profits an energy supplier can make to 1.9%. Ofgem are responsible for setting the energy price cap. You can find out more here:
www.ofgem.gov.uk/publications/ofgem-confirms-changes-price-cap-methodology-and-frequency-ahead-new-rate-be-announced-later-month

You can find out more about the Government's Energy profits tax here: www.gov.uk/government/publications/cost-of-living-support/energy-profits-levy-factsheet-26-may-2022

You can find out more about nationalisation and how it works in this House of Commons Library note: commonslibrary.parliament.uk/research-briefings/cbp-8325/

You can find out more about energy prices including support available and how and why energy prices are changing in this House of Commons Library note: commonslibrary.parliament.uk/research-briefings/cbp-9491/