MCS Certificate

An MCS Installation Certificate is the compliance document an MCS-certified installer issues on completion of a qualifying renewable energy installation. MCS (Microgeneration Certification Scheme) is the UK's government-backed quality mark for small-scale renewables, established in 2007, covering solar PV, heat pumps, battery storage, and small wind. It is the primary document a homeowner or business needs to access Smart Export Guarantee (SEG) payments from energy suppliers.

What the Certificate Covers

The certificate records the technology type, system specification (panel make/model, inverter make/model, total kWp), commissioning date, and the installing company's certified details. MCS certification belongs to the installation business as a legal entity, not to individual engineers - a distinction that matters when named operatives change. The installation must be registered in the MCS Installations Database (MID) within ten working days of commissioning. Customers can verify any installation by searching the publicly available MID at certificate.microgenerationcertification.org. The certificate also supports eligibility for government-backed schemes including ECO4, the Boiler Upgrade Scheme, and the Home Upgrade Grant.

The SEG Connection

The MCS certificate is the key document for Smart Export Guarantee registration. As of 2026, fixed SEG rates range from 3.5p to 15p per kWh, with premium tariffs reaching 25p or higher during peak periods. A typical 4kWp system exporting 1,500 to 2,000 kWh per year earns £150 to £300 annually - money the customer cannot access without a valid certificate. Customers apply via their preferred energy supplier's SEG portal, uploading the certificate and meter MPAN, and registration typically takes 4 to 6 weeks. For installers, completing MID registration on commissioning day removes the main administrative delay between finished work and final invoice.