Five energy suppliers have been banned from taking on new customers until they sign up to the smart meter network operator.
Ofgem issued final orders to Daligas, Enstroga, Entice Energy Supply, Euston Energy (trading as Northumbria Energy), and Symbio Energy.
All suppliers were required to become Data Communications Company (DCC) users from 25 November 2017, to enable the enrolment of first-generation smart meters (SMETS1) and drive the installation of next generation (SMETS2) smart meters.
Currently any customers switching to the five suppliers would see their DCC-connected smart meter go dumb.
The regulator initially consulted on issuing nine suppliers with final orders in January, giving them a deadline of 31 March 2020 to comply.
Three of these suppliers – Ampower, Green Supplier, UK National Gas – have since become compliant and will not be issued with final orders.
A fourth supplier, Better Energy, has asked for its supply licences to be revoked having sold all its customers to PFP Energy earlier this year.