MCS Certification Farm Solar — Why It Matters in 2026
Published by SEO Dons · Last reviewed October 2026
MCS — the Microgeneration Certification Scheme — is the UK’s quality-assurance scheme for small-scale renewable installations; for solar PV it covers systems up to 50 kW. On a farm it matters mainly for Smart Export Guarantee payments on systems up to 50 kW and as a check on an installer’s quality systems. It is not a grant key: in 2026 no farm solar grant is open in any UK nation (see our grants page). This guide covers what MCS covers, what it does not, and how to verify an installer.
What Is MCS Certification?
MCS is an industry-led quality assurance scheme supported by the Department for Energy Security and Net Zero. The scheme certifies both installation companies and the products they install, ensuring that renewable energy systems meet published standards for design, installation, and performance. MCS certification operates on two levels: product certification ensures that solar panels, inverters, and mounting systems meet performance and safety standards; and installer certification ensures that companies have the technical competence, quality management systems, and customer protection measures to deliver reliable installations.
What MCS Certification Requires of Installers
To be certified, an installation company has to show competence in designing and installing the technology, work to the scheme’s installation standard, hold the insurance the scheme requires, and submit to surveillance audits by a certification body. The scheme’s own documents set out the detail, so check them rather than relying on a summary.
What MCS Certification Does and Does Not Do for a Farm
For agricultural solar, MCS matters in two practical ways: Smart Export Guarantee access on smaller systems, and a visible quality standard when you compare installers. It does not unlock grants, because none is open.
Grant Eligibility
Grant schemes set their own certification rules, so read the scheme guidance whenever a round opens. As of 3 November 2026 no farm scheme in any UK nation funds solar panels (Northern Ireland’s 20% NISEP grant for business solar has closed for its 2026/27 round) — England’s Improving Farm Productivity grant, which paid up to 25% towards rooftop and irrigation-reservoir solar, has closed — so check the dated position on our solar grants for farmers page before planning around a grant.
Smart Export Guarantee Access
This is where certification matters most. Under Ofgem’s Smart Export Guarantee guidance, suppliers ask for MCS or an equivalent certification for solar systems up to 50 kW; from 50 kW to 5 MW, the installation has to be certified to the supplier’s satisfaction, and each supplier decides what it accepts. Without certification a supplier is not obliged to pay for exports. Each supplier also sets its own rate — roughly 4p to 12p per kWh as at July 2026 — and on most farms electricity used on site is worth far more than electricity exported, so size the system around daytime demand.
Standards, Contracts and Warranties
MCS certification means the installer works to MCS’s installation standard for solar PV (MIS 3002, which covers systems up to 50 kWp), including the roof checks and commissioning tests. For a farm business the practical checks are the contract terms, the workmanship warranty and how it is protected if the installer stops trading, your insurer’s requirements before work starts, and any installer conditions in the panel and inverter warranties.
A closely related question is choosing an agricultural solar installer.
What an MCS certificate for solar panels shows
When a certified installer commissions a solar PV system of up to 50 kW, it registers the installation on the MCS Installation Database and the scheme issues an MCS certificate. The certificate records the installer’s MCS number and certification body, the system’s declared capacity in kWp, the modules and inverter installed, the commissioning date and the site address. Three things follow. First, the certificate number is what a Smart Export Guarantee supplier asks for on a system up to 50 kW, so keep it with the handover pack. Second, the certificate is evidence that the installation was done under the MCS standard for solar PV (MIS 3002) by a company that was certified on the day, which matters if the installer later stops trading and you need to claim on an insurance-backed warranty. Third, it is not a performance guarantee: the kWh the system produces depend on the roof, the design and the weather, and the certificate says nothing about that.
MCS certificate for solar panels: how to check one
Ask the installer for its MCS certificate number before you sign and look it up on the MCS “Find a certified installer” search at mcscertified.com; the listing shows the technologies the company is certified for (solar PV, battery storage, heat pumps) and whether its certification is current. After commissioning, ask for the installation certificate itself; a copy also goes to the MCS database, and you can ask MCS to confirm a certificate against the address. A company that describes itself as “MCS accredited” or “working towards MCS” is not certified, and a supplier may not accept the installation for export payments.
How to Verify MCS Certification
Verifying an installer’s MCS certification status is straightforward. The MCS Installation Database at mcscertified.com provides a searchable directory of all currently certified installers. Each listing shows the technologies the company is certified to install (solar PV, battery storage, heat pumps etc.), their certification body, and their current certification status. When requesting quotes from solar installers, always ask for their MCS certificate number and verify it against the database. Legitimate MCS certified companies will readily provide this information and will have their MCS certification number displayed on their website and marketing materials. Be cautious of companies claiming to be “MCS accredited” or “working towards MCS certification” — these are not the same as being MCS certified, and a supplier may not accept such an installation for Smart Export Guarantee payments.
MCS for Larger Farm Systems (Over 50kW)
The standard MCS scheme covers installations up to 50kW. For larger farm systems — and many agricultural installations exceed this threshold — the situation requires additional consideration. Systems between 50kW and 5MW fall under different regulatory frameworks. The Smart Export Guarantee is available for systems up to 5MW, but larger systems require separate Power Purchase Agreement (PPA) arrangements for export income. Above 50 kW the MCS standard for solar PV does not apply, so ask the installer what standards, insurance and warranty they will put in the contract, and ask your Smart Export Guarantee supplier what evidence it accepts. Any grant that reopens will set its own requirements.
Red Flags: Signs of Non-Compliant Installers
The rapid growth of the farm solar market has attracted companies that cut corners on certification and quality. Warning signs to watch for include: significantly lower quotes than competing MCS certified companies (price alone does not show quality, but an unexplained gap is worth asking about); pressure to sign contracts quickly without detailed site surveys; reluctance to provide MCS certificate numbers or references from previous agricultural installations; proposals using unfamiliar or unbranded solar panels or inverters that may not be MCS certified products; and verbal promises about grant eligibility, when no farm solar grant is open. Agricultural solar is a significant investment, and the consequences of a poor installation — underperformance, safety issues, voided warranties, lost grant eligibility — far outweigh any short-term savings from using non-certified installers.
Conclusion
MCS certification is a useful check, not a guarantee. It is the standard suppliers look for on Smart Export Guarantee systems up to 50 kW, and a sensible starting question when you compare installers. Above 50 kW, and for everything else that matters on a farm roof (structure, asbestos, grid connection, warranty and insurance terms), the contract and the survey carry the weight. Verify certification on the MCS database, ask for the certificate number, and compare written quotes against the government cost data on our cost page.
Related reading
- Farm solar installers UK — twelve questions to ask before you sign.
- Installation Process — the steps a farm solar project should follow.
- Solar grants for farmers — what is open in each nation, and what has closed.
- Solar Panel Installation Service — what to expect from an installer visit.
Ready to get a quote for your farm? Get a free quote study →