Top Solar Companies in the UK 2026: Best Installers & MCS Firms

Top Solar Companies in the UK 2026

The United Kingdom installed 4.7 GW of new solar capacity in 2024 — its highest since the FiT era — driven by record high electricity prices, the Smart Export Guarantee (SEG), and strong commercial demand. Total UK capacity has now surpassed 18 GW, and the government's Clean Power Action Plan targets 50 GW by 2030.

The UK Solar Market in 2026

Key developments shaping the UK solar sector:

• Smart Export Guarantee (SEG): Replaced the Feed-in Tariff in 2020. Energy suppliers must offer payments for exported solar energy; competitive tariffs are now available from Octopus (15p/kWh), E.ON, and others.
• Commercial solar boom: High business energy prices (£0.25–0.35/kWh) have driven record commercial installations on warehouses, supermarkets, and office buildings.
• British Energy Security Strategy: The UK government has committed to doubling offshore wind and significantly accelerating solar approvals — including ending restrictions on solar farms on lower-grade agricultural land.
• VAT exemption: Since April 2022, residential solar panels are VAT-free (0% VAT) for 5 years — saving £500–£1,500 on a typical installation.

MCS Certification: What It Means

MCS (Microgeneration Certification Scheme) is the UK's primary quality assurance framework for small-scale renewable energy. Only MCS-certified installers can install systems that qualify for SEG payments and government schemes.

When choosing a solar company in the UK, always verify MCS certification at mcscertified.com. MCS-certified installers must meet standards for design, installation, and commissioning.

UK Solar Incentives in 2026

• Smart Export Guarantee (SEG): Payments of 7–15p/kWh for exported electricity. Available from all licensed suppliers with 150,000+ customers.
• 0% VAT on solar: Extended to April 2027 by the 2023 Finance Act.
• ECO4 scheme: Energy Company Obligation — funded solar for low-income households and hard-to-heat homes.
• UKSPF: UK Shared Prosperity Fund — local authority grants for small businesses installing renewable energy.
• Enhanced Capital Allowances (ECA): Businesses can offset 100% of solar installation costs against taxable profits in year one.

How to Evaluate Solar Companies in the UK

• MCS certification: Mandatory for SEG eligibility. Verify at mcscertified.com.
• Companies House registration: Check the installer's company registration at companieshouse.gov.uk. Look for trading history of at least 3 years.
• NICEIC or NAPIT registration: For electrical work safety and compliance.
• Which? Trusted Traders: An optional but respected accreditation for residential installers.
• HIES or RECC membership: Consumer protection schemes covering solar installations — mandatory for some finance products.

Regional Solar Markets in the UK

South East England: Highest irradiance in the UK (1,000–1,100 kWh/m²/year). Surrey, Kent, and Sussex have dense residential solar markets.

South West England: Cornwall and Devon lead on community solar and agricultural rooftop installations.

Midlands: Strong commercial market in the logistics and manufacturing corridor (M1/M6 corridor). Several EPC firms specialise in large distribution centre rooftops.

Scotland: Lower irradiance (850–950 kWh/m²/year) but generous local authority grants via LBEG (Local Business Energy Grant). Wind-solar hybrid projects are common.

FAQs: Solar in the UK

Is solar worth it in the UK in 2026?

Yes. With electricity prices at £0.25–0.30/kWh and SEG payments added, a 4 kWp south-facing residential system in southern England typically pays back in 8–11 years. Commercial systems with higher self-consumption ratios can pay back in 5–7 years.

How do I check if a solar company is MCS certified?

Visit mcscertified.com and use the "Find an Installer" tool. Enter the company name or postcode to verify certification status and scope (solar PV, battery storage, etc.).

What is the difference between on-grid and off-grid solar in the UK?

On-grid (grid-tied) systems feed excess power back via the SEG. Off-grid systems are completely independent, common in rural areas without grid access. Hybrid systems combine grid connection with battery backup.