SMETS1 GPF Means that part of a SMETS1 GSMS that is not a SMETS1 CHF and is powered by mains electricity. For the avoidance of doubt, a SMETS1 GPF excludes any SMETS1 GSME. Related Articles: Glossary: Gas Proxy Function« Back to Glossary Index Smart Metering Equipment Technical Specifications 1 Communications Hub Function Gas Proxy Function Gas Smart Meter