Insights for commercial solar finance.
Working editorial on tariffs, allowances, the macro backdrop, and the practical mechanics of structuring commercial solar projects in the UK. No vendor pieces — just working numbers and what they mean.
UK regional solar funds compared 2026 — all 30+ programmes
Comprehensive table of UK regional commercial solar funding — combined authorities, Investment Zones, devolved-nation schemes, foundation grants, innovation funding.
Battery retrofit on existing commercial solar — when it works and when it doesn't
Battery retrofit on existing commercial solar — inverter compatibility, DNO consent, project economics, and the scenarios where retrofit makes sense.
A real half-hourly data analysis: how the right size moved IRR by 4 points
A working-numbers walkthrough of half-hourly demand data analysis on a Yorkshire food production site.
NHS Trust PSDS Phase 4 application strategy — bundles that win
NHS Trust PSDS Phase 4 application strategy — bundles, multi-site portfolio bids, what scoring patterns emerge in awarded bids.
FYA deadline mechanics: year-end planning for the 31 March 2026 cliff
Practical year-end planning for capturing the 50% First Year Allowance before the 31 March 2026 deadline.
The 2026 Budget and the 50% FYA: what changed and what it means for commercial solar
The 50% FYA extension to 31 March 2026 is the most consequential single line for commercial solar economics.
Solar carport economics in 2026 — when the second-storey roof is worth it
Commercial solar carport economics in 2026. Capex premium versus rooftop, EV charging integration, scenarios where carports beat rooftop.
Solar export limits in the UK 2026 — when the DNO becomes the binding constraint
UK DNO export consents are increasingly the binding constraint on commercial solar sizing — particularly on industrial estates with limited grid headroom.
After-tax IRR modelling: what installer brochures get wrong
Installer brochures routinely quote 25-year IRRs of 25–35%. Our modelling on the same projects produces 14–20%.
Where commercial electricity tariffs are heading in 2026
Wholesale, network charging, and policy costs decomposed for 2026 commercial electricity tariffs.
AIA vs FYA detailed comparison — when each wins for commercial solar
Detailed comparison of Annual Investment Allowance vs 50% First Year Allowance for UK commercial solar with worked numbers.
Capex vs PPA: a decision tree for commercial solar in 2026
A structured decision framework for choosing between capital purchase and Power Purchase Agreement.
PSDS Phase 4: what we're seeing in the application pipeline
Working notes from the PSDS Phase 4 application window: cost-per-tonne thresholds, common scoring failures.
MEES-driven commercial solar — refurbishment windfall in 2026
How the Minimum Energy Efficiency Standards (MEES) framework drives commercial property solar deployment.
When battery storage actually changes the solar finance case
Battery economics for commercial solar in 2026: time-of-use exposure, export-limit relief, capacity market access.
The landlord-tenant solar split: structures that actually work
Three workable solutions to the landlord-tenant capex/benefit split for commercial solar.
Why half-hourly demand data changes the system size answer
Designing commercial solar by half-hourly demand profile rather than headline annual consumption.
Smart Export Guarantee tariffs Q1 2026: a cross-supplier comparison
Smart Export Guarantee tariff comparison across the major UK licensed suppliers in Q1 2026.
Frequently asked questions
What topics does the Commercial Solar Finance insights section cover?
How does the FYA interact with different commercial solar finance structures?
What is the current UK grid carbon intensity and why does it matter for solar?
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Commercial solar finance insights: analysis and commentary
Our insights section provides in-depth analysis of commercial solar finance trends, policy changes, and market developments. Written for finance directors, energy managers, and sustainability leads, these articles go beyond headline news to examine what policy and market changes mean for your solar investment decision.
Featured insights
AIA vs 50% FYA: detailed comparison for 2026
Analysis of when Annual Investment Allowance and 50% First Year Allowance each apply, with worked examples for systems ranging from 100kWp (£88,000) to 2MWp (£1.5m). Covers the £1m AIA threshold, group company AIA sharing, and strategies for maximising first-year tax relief on large installations.
Battery retrofit for existing solar installations 2026
Analysis of the economics of adding battery storage to existing commercial solar installations, including half-hourly demand modelling, SEG arbitrage opportunities with Octopus Agile, demand response revenue, and asset finance options for battery additions. Case studies from logistics, manufacturing, and NHS sites.
NHS PSDS Phase 4 application strategy
Detailed analysis of NHS Trust PSDS Phase 4 application criteria, scoring methodology, and application strategy. Covers how to structure combined solar + heat pump projects for maximum grant award, common application weaknesses, and how NHSE support teams can assist.
Commercial solar carports: economics in 2026
Comprehensive analysis of solar car park canopy economics — construction costs per kW, shading profiles, EV charging integration revenue, planning requirements, and finance structures for car park solar projects. Includes comparison of steel vs membrane canopy structures.
CapEx vs PPA decision tree
A structured decision framework for commercial solar finance selection, incorporating credit profile, lease/ownership status, tax position, AIA benefit, cash availability, and long-term strategic goals. Interactive tool with worked examples for common business scenarios.
Recent policy and market developments
AIA permanent confirmation
HMRC confirmed the £1m Annual Investment Allowance is now permanent (previously subject to annual reconfirmation). This removes the timing risk that previously encouraged businesses to rush installations before year-end to secure AIA. Businesses can now commit to solar on their own schedule without AIA cliff-edge concerns.
PSDS Phase 4 funding committed
The government committed £1.425 billion to PSDS Phase 3e and beyond through to 2028. This multi-year commitment improves planning certainty for public sector bodies considering large decarbonisation programmes. SALIX application windows are expected to open bi-annually through 2027.
SEG market competition increasing
The Smart Export Guarantee market has matured with increasing competition between suppliers. Octopus Agile export now pays average 6–12p/kWh vs the 3p/kWh floor from most suppliers. For commercial solar owners with battery storage, smart SEG selection adds meaningful income over 20-year system life.
Staying current with commercial solar finance
The commercial solar finance landscape evolves continuously — driven by Bank of England rate decisions (affecting green loan pricing), government spending reviews (affecting PSDS funding), HMRC Capital Allowances guidance updates, and SEG market competition. Our insights are updated regularly to reflect these changes.
For personalised advice on how current market conditions affect your specific solar project, contact our specialist commercial solar finance team for a no-obligation consultation.
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