The deadline for submitting details is September 30th and the Environment Agency is anticipating an influx in applications from enterprises as the date gets closer.
"We would urge the remaining businesses to sign up now and not leave registration to the last minute," remarked head of climate change and sustainable development Tony Grayling.
A revised estimate shows up to 4,000 businesses are obligated to register, lower than the initial estimate of 5,000.
Applications for the scheme, which aims to help large public and private sector firms save costs by cutting their energy bills, opened on April 1st.
Posted by Jim Tidy
Click here to run an energy price comparison, and see if you could be paying less for your gas and electricity.