Every solar installation in Glasgow must be notified to SPEN (Scottish Power Energy Networks), the local Distribution Network Operator. The form used depends on system size: G98 for smaller systems, G99 for larger ones. Your MCS-certified installer handles all of this for you — you do not need to contact SPEN yourself.
What is SPEN?
SPEN (Scottish Power Energy Networks) is the electricity distribution network operator for Glasgow and central Scotland.
Scottish Power Energy Networks owns and maintains the electricity distribution network across central and southern Scotland, including all of Greater Glasgow (G postcodes G1–G78). Any equipment that generates electricity and connects to the grid must be registered with the local DNO — in Glasgow, that is SPEN.
What is a G98 fast-track notification?
G98 is a post-installation notification for smaller solar systems up to 3.68 kW on a single-phase supply.
G98 applies to smaller solar systems up to 3.68kW on a single-phase supply (16A per phase). It is a notification, not an application — the installer submits it after commissioning, and SPEN acknowledges it. There is no approval wait before installation can proceed.
What is a G99 full application?
G99 is a pre-installation application required for systems that exceed the 3.68 kW single-phase G98 threshold.
G99 applies to larger systems. The standard 6kW domestic specification (12 × AIKO Comet 500W panels) requires a G99 application because it exceeds the 3.68kW single-phase threshold. Your installer submits the application to SPEN before installation. SPEN’s typical response time is currently 4–6 weeks for domestic applications.
What do Glasgow homeowners need to do about SPEN?
Nothing. Our MCS-certified installation partner handles all SPEN paperwork and the cost is included in the system price.
Nothing. Our MCS-certified installation partner, Home Heating Services (Scotland) Ltd, handles all SPEN paperwork as part of the installation process. The cost is included in the system price. If SPEN requires a grid study or imposes export limitations, your installer will explain this during the survey.
What about three-phase supplies?
Three-phase properties can connect up to 11.04 kW under the simpler G98 process. Your installer checks your supply type.
Some larger Glasgow properties have three-phase electricity supplies. Three-phase systems can connect up to 11.04kW (3.68kW per phase) under the simpler G98 process. Your installer checks your supply type during the no-obligation survey.
Sources: Engineering Recommendation G98 (Issue 1, Amendment 6). Engineering Recommendation G99 (Issue 1, Amendment 9). SPEN connection guidance at spenergynetworks.co.uk.
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