Refer to the input text as context and select the correct relationship between 'CENTRICA' and 'energy supply' from the available options.
Options: platform, creator, industry, developer

* CENTRICA - Britain's largest utility will sell up to 1 billion pounds worth of upstream and wind assets by 2017 and reduce net headcount by around 4,000 staff in a strategy shift that will see it put more emphasis on energy supply and services.
industry