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A rollover contract (also known as evergreen, assumptive renewal) is ‘an agreement between two
parties that is automatically renewed (rolled over) after each completion – or maturity period until
cancelled by either party.’ Unlike household energy contracts, nearly all gas and electricity for business
contracts are evergreen, meaning they automatically renew themselves if you don’t terminate them
with a letter of notice. Some suppliers renew over 90% of their customers in this way, rolling them
over on to new not-so-cheap energy prices when often the customer is unaware this is happening.