The Industry Metering Advisory Group (IMAG), sponsored by ELEXON and Ofgem, set up the in-service testing (IST) and post-Measuring Instruments Directive (MID) expert group (IST 1), to develop proposals for the in-service accuracy monitoring of MID approved domestic type gas and electricity meters. A further expert group (IST 2) was subsequently established to develop additional proposals to ensure the other legislative requirements aside from meter accuracy were also covered.
The combined proposals of these groups were published in the IST group 1 and 2 report that was accepted by IMAG and Ofgem in 2008. These proposals set out a methodology based on sample testing whereby energy suppliers and asset owners can demonstrate they are fulfilling their statutory obligation to keep their meter populations in proper order for correctly registering the quantities of gas and electricity consumed.
A further expert group (IST 3) was then established to consider the costs of the IST scheme and possible governance arrangements. Its findings were published in the IST group 3 report in 2009, and a consultation on the governance options was subsequently published.
The Office for Product Safety and Standards is currently responsible for the metrological performance of gas and electricity meters and for the governance of the IST scheme.
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