The energy regulator Ofgem has not worked on understanding hydrogen domestic metering and has not been able to say whether the current roll-out of smart meters will prove ineffective if hydrogen is used in domestic metering. Ofgem was also unable to provide cost estimates for how expensive a hydrogen-ready smart meter roll-out would be under different scenarios, or what the cost implications would be for the consumer. This has arisen, it was suggested to us, because the responsibility for domestic metering is no longer within the remit of Ofgem. Domestic metering is an issue that has been overlooked, and we are concerned that Ofgem is not fulfilling its specified remit of protecting the consumer.