The three end-of-term options
When your Solar PPA term completes (typically 10-25 years), the contract usually provides three options:
- Transfer ownership of the solar system to your business for a nominal sum
- Extend the PPA for additional years at a renegotiated rate
- Have the funder remove the system at no cost to you
You typically choose between these in the final 12-24 months of the PPA term.
Option 1: nominal asset transfer (most common choice)
The system is transferred to your business for a nominal payment. From that point:
- You own the system outright
- All electricity generated is free (you no longer pay the per-kWh PPA rate)
- You take on maintenance responsibility, typically £8-15 per kWp per year for ongoing O&M
- You bear performance and replacement risk, particularly inverter replacement around year 15
The economics of the transfer
Modern solar PV panels are warranted for 25-30 years and typically operate well for 30+ years total. So a 20-year PPA transferring to you at year 20 gives you potentially 10+ years of free electricity from a fully depreciated asset.
For a typical 250kWp system generating 225,000 kWh per year, that's 2.25 million kWh of free electricity over the post-PPA decade, worth a substantial amount at current commercial electricity rates.
What you'll need to budget for
While the system is "free", ongoing operational costs continue:
- Annual O&M, visual inspection, cleaning if needed, monitoring: a modest amount per kWp each year
- Insurance, usually folded into building insurance, marginal addition
- Inverter replacement, around year 15-20 from original install, a modest amount per kWp
- Monitoring service, ongoing portal access, performance reporting: a modest amount per year
Option 2: PPA extension
Extend the PPA for an additional 5-15 years at a renegotiated (typically lower) per-kWh rate. The funder continues to own and maintain the asset.
When extension makes sense
- You don't want operational responsibility, your team isn't set up to manage solar O&M
- You value continued maintenance and insurance coverage, preserve the operational simplicity
- The asset is performing well but ageing, you'd prefer funder to bear replacement risk for components
- You want to lock in even lower per-kWh rates, extension PPAs often achieve significantly lower rates since most capital has already been recovered
Extension rate negotiation
Extension rates are typically negotiated based on the remaining asset value and required return:
- Original PPA might have been at its contracted rate
- Extension PPA might be at a low rate
- Still meaningful savings vs grid
- Funder accepts lower return because capital is already recovered
Option 3: System removal
The funder removes the system at no cost to your business. Your roof returns to its original condition.
When removal makes sense
- You're vacating or selling the property, incoming occupier doesn't want the system
- Roof refurbishment is needed, you want to refit a new roof without the existing solar
- Building reconstruction or extension, major works requiring system removal
- Replacement with newer technology, you want to install a more efficient new system (some sites do this with 25+ year original installs)
Practical considerations
- Removal is funded by the original PPA terms, no cost to you
- Roof penetration points are sealed and made good
- Existing electrical isolation and metering equipment may need decommissioning
- The decommissioned system is typically sold for refurbished use or recycled (high-value materials including glass, aluminium, silicon, copper)
Which option do most businesses choose?
In our experience, the overwhelming majority of UK commercial PPA clients choose Option 1 (nominal transfer). The economic value of post-PPA free electricity from a still-functional asset is too significant to walk away from. Even with the burden of taking on O&M responsibility, the math is overwhelmingly favourable.
Option 2 (extension) is chosen by larger organisations with strong preference for operational simplicity and predictable budgets. Option 3 (removal) is rare and usually triggered by property changes rather than active choice.
What if you want to decide later?
You don't have to decide at PPA signing. The contract specifies the three options, but actual choice is made in the final 12-24 months of the term. Your circumstances 15-25 years from now may be different from today, the PPA structure preserves flexibility.
Asking the right question now
For PPA decisions today, the key question isn't "what will I do at end of term?", it's "do I want to lock in fixed-rate, lower-cost electricity for the next 15-25 years?". The end-of-term flexibility is a feature, not a constraint.