💷 Corporate Solar Finance & Tax Guide

Commercial Solar Power Purchase Agreements (PPA) Explained

Zero-CAPEX Commercial Solar: Cut Electricity Rates by 30%–50% with No Capital Outlay

Everything UK facilities managers, landlords, and financial controllers need to know about corporate Solar Power Purchase Agreements (PPAs): zero upfront investment, fully maintained solar arrays, and discounted unit electricity rates.

Executive Summary & Key Takeaways

✓ Zero upfront capital expenditure: feasibility, hardware, installation, and lifetime O&M are 100% funded
✓ Discounted unit electricity rates (typically 11p–15p/kWh vs 22p–35p/kWh grid imports), generating immediate 30%–50% savings
✓ Off-balance-sheet operational expenditure (OpEx) accounting model with zero technical performance risk
✓ Standard terms range from 15 to 25 years with index-linked or fixed predictability
✓ Ideal for commercial property portfolios, schools, large industrial plants, and multi-let estates

Commercial Feasibility Portal

Request Engineering Desk Feasibility & DNO Assessment

Indicative kWp sizing, G99 grid headroom check & 100% AIA tax shelter calculation.

Stage 1 of 520% Complete

Select Your Facility Sector

Enterprise Compliance

Vetted UK Commercial EPC Installation Network

Our commercial installation partners are rigorously vetted and accredited to the UK's highest technical, electrical, and site-safety standards:

CHAS Elite

SSIP Acclaimed

SafeContractor

SSIP Member

NICEIC Approved

Commercial Contractor

ISO 9001 / 14001

Quality & Environment

Solar Energy UK

Corporate Member

MCS Certified

Microgeneration Standards

How a Corporate Solar PPA Works

Under a commercial rooftop Power Purchase Agreement (PPA), an institutional clean energy fund or specialized infrastructure provider (such as Path Energy or Eden Sustainable) finances, designs, installs, owns, and maintains the solar PV installation on your commercial roof. The host business provides roof space via a standard lease or licence and agrees to purchase the clean electricity generated by the panels at an agreed unit price per kilowatt-hour (kWh).

Financial Mechanics: Unit Tariffs vs Retail Grid Imports

UK commercial grid electricity tariffs regularly fluctuate between 22p and 35p per kWh, with non-commodity network charges (DUoS, TNUoS, and CCL) continuing to climb. PPA tariffs are typically structured between 11p and 15p per kWh, delivering immediate 30% to 50% utility cost avoidance from day one of energisation. PPA contracts can be structured as fixed rates, fixed-escalation (CPI/RPI-linked), or floating discount rates against prevailing market prices.

Asset Management and Operation & Maintenance (O&M)

Under a PPA, all ongoing maintenance, inverter replacements, insurance, cleaning, and performance monitoring are the sole contractual responsibility of the asset owner. Because the fund's financial return depends entirely on generating kilowatt-hours, the investor is incentivized to maintain maximum operational uptime throughout the 15 to 25-year contract term.

End-of-Term Options & Building Sale Mechanics

At the conclusion of the PPA term, the host business typically has three options: take full ownership of the solar installation at nominal value (£1) and continue generating free electricity for the remaining lifespan of the panels; request the asset owner remove the system and restore the roof; or extend the PPA agreement. If the host business sells the commercial premises during the term, the PPA is simply novated to the incoming building purchaser.

Financial Q&A

Frequently Asked Questions

Key financial controllers and CFO considerations

What are the minimum eligibility criteria for a UK commercial solar PPA?

Institutional PPA funders typically require a minimum system size of 100kWp (approx. 5,000–8,000 sq ft of unshaded roof), a commercial electricity spend exceeding £20,000/year, and a host company with a strong credit rating and at least 15–20 years remaining on building tenure.

How does a PPA appear on corporate balance sheets under IFRS 16?

Because a rooftop PPA is structured as an energy supply contract where the client purchases generated power rather than leasing the physical asset, it can qualify as an off-balance-sheet operational expense (OpEx), avoiding lease liabilities.

What happens if our company uses less electricity than the panels generate?

The PPA funder meters the exact electricity consumed behind your meter. Unconsumed surplus power is exported to the grid by the funder under their corporate export contract; you are only invoiced for the energy your facility actually consumes.