* 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.
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