This measure removes the exemption from the climate change levy (CCL) for RSE which is supplied to business or public sector consumers under the terms of a renewable source contract. There will be a transitional period from 1 August 2015, during which electricity suppliers will be able to continue to exempt RSE generated before that date. This will be permitted if they hold sufficient renewable levy exemption certificates (LECs) that relate to that electricity and use them against supplies they make to eligible consumers. The length of this transition period will be discussed with regulators and affected businesses over the summer and autumn.