Operators have less than six months to meet EU requirements.
The EU is introducing legislation to monitor energy management, which could hit data centre operators and tenants with large fines.
The Energy Savings Opportunity Scheme (ESOS) is the UK Government’s approach to meeting Article 8 of the EU Energy Efficiency Directive, which has set energy efficiency reduction targets of 20% by 2020.
The EU made the policy mandatory for all businesses with over 250 employees or a turnover and balance sheet of €50 million and €43 million respectively.
According to Keysource, colo providers and customers have until December 5, 2015 to carry out energy audits on their operations and build a report of it.
The Environment Agency told Keysource that "both the provider and client are likely to have obligations within a collocation data centre due to both having ownership of equipment that draws energy".
Justin Busk, Head of Safety, Health and Environment at Keysource, said: "This legislation is complex and it can be hard for organisations to see how it will impact their business.
"We would advise them not to view this as just another piece of compliance legislation, as we believe it provides great opportunities for both a reduction in operation costs and power usage as well as an increase in resilience."