The Industry is a collection of third party companies and regulators who exchange information between suppliers. 

Every energy supplier uses the Industry to exchange data, called Industry data. We exchange information like previous meter readings, dates of past meter exchanges, and if you have an Economy 7 meter, when your meter switches from day to night. 

When you switch energy supplier, your opening meter readings are sent to The Industry to be checked against your previous readings. After they’ve been checked, they’re sent to both your new and old supplier. That’s why it takes longer for your first and final bill to be produced.