FOI - Use of Public Buying Organisation (PBO) for energy

I am writing to you under the FOIA 2000 to request the following information from your Council: 1-Do you use a public buying organisation for energy  - examples of PBOs are defined in (link provided); 1a-Please can you advise the identity of this PBO to me?; 2-Name of your supplier for gas; 3-Name of your supplier for Non half hourly electricity; 4-Name of your supplier for half hourly electricity; 5-The end date of your contract for these energy supply contracts.