What is the address of Central power purchasing agency guarantee limited?

Could you please clarify for me the exact address of the Central Power Purchasing Agency Guarantee Limited? I am in need of this information for a project I am working on, and I would greatly appreciate if you could provide me with the full and accurate address details. It would be very helpful if you could also let me know if there are any specific requirements or procedures that I need to follow in order to access or contact the agency. Thank you in advance for your assistance.