Solar Glossary

MCS Certification

MCS (Microgeneration Certification Scheme) is the UK quality standard that solar installers and products must meet for installations to qualify for government incentives and consumer protections.

MCS Certification explained

MCS (Microgeneration Certification Scheme) is the UK's industry standard for small-scale renewable energy. For homeowners, it matters in two important ways:

1. Installer certification: Only MCS-certified installers can carry out installations that qualify for government schemes such as the Smart Export Guarantee (SEG), which pays you for surplus electricity exported to the grid. Using an uncertified installer means you may not be able to register for SEG payments.

2. Product certification: MCS-certified installers are required to use MCS-listed products, ensuring panels and inverters meet minimum quality and safety standards.

Additional benefits of using an MCS installer:

  • Access to the MCS Consumer Code, which provides independent dispute resolution if something goes wrong
  • Installations meet building regulations requirements automatically
  • Required for 0% VAT to apply to your installation (post-April 2022)
  • Your DNO application is handled correctly, as MCS installers understand grid connection requirements

You can verify any installer's MCS certification at the official MCS website (mcscertified.com). Always check before signing a contract — unfortunately, some rogue traders falsely claim MCS certification. Getting three quotes from MCS-certified installers is the recommended starting point for any UK solar purchase.

How this affects your solar decision

Using an MCS-certified installer is essential in the UK to access SEG payments and VAT relief, directly affecting your payback period. Use the Solar Savings Calculator to see how SEG income affects your returns.

See how SEG payments from MCS installations boost your savingsSolar Savings Calculator

Related terms

VAT on Solar PanelsIn the UK, solar panel installations are currently zero-rated for VAT (0%), saving homeowners up to £1,500 or more compared to the standard 20% VAT rate.DNO ApplicationA DNO application is the formal notification or permission request sent to your local electricity network operator before connecting a solar system to the grid.Permitted DevelopmentPermitted Development rights allow most UK homeowners to install solar panels without needing to apply for planning permission, as long as certain conditions are met.Solar FinancingSolar financing refers to the various ways homeowners can fund a solar installation, including cash purchase, personal loans, green mortgages, and government-backed schemes.Smart Export Guarantee (SEG)The Smart Export Guarantee is the UK scheme that requires energy suppliers with 150,000+ customers to pay solar panel owners for electricity they export to the grid.
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