UPDATED 30 September 2026
When businesses compare solar proposals, they often focus on installation cost, system capacity, and electricity rate. While these factors are important, the long-term value of a solar system also depends on how well it is managed after installation.
Installing the panels is only the beginning of the system’s operating life. A commercial solar system functions like a small power plant on the building’s rooftop, and while it’s largely low-maintenance and runs without day-to-day human intervention, it still requires regular oversight to keep it operating safely and efficiently. This means ongoing monitoring and technical support, with inspections, cleaning and upkeep scheduled to suit each site’s specific needs.
That is one of the key advantages of working with a corporate solar PPA provider in Singapore. Under a solar leasing or Power Purchase Agreement (PPA), providers like Terrenus Energy do more than fund and install the system.They also remain responsible for operating and maintaining it throughout the agreement, while the customer purchases the solar electricity generated at the agreed rate.
This allows businesses to adopt solar without hiring additional technical staff or taking on the day-to-day work of managing the equipment themselves.
In this blog, we will explain what happens after a commercial solar system is installed, what solar operations and maintenance covers, and why it matters just as much as system design and electricity rate.
Commissioning confirms that the solar system has been installed properly, is operating safely, and is ready to generate electricity. However, it does not mark the end of the provider’s involvement. It marks the start of the system’s long-term operating period.
From that point onwards, the panels, inverters, cabling, meters, and monitoring equipment all need continued oversight. Each component plays a role in converting sunlight into usable electricity and recording how the system performs.
Several factors can affect generation over time. Dirt and debris may reduce the amount of sunlight reaching the panels. Inverters or electrical components may develop faults. Changes around the building may create new shading. Monitoring equipment can also lose communication even when parts of the system continue operating.
Solar panels also experience gradual degradation over their operating life. This is expected. The bigger concern is an unexpected issue that reduces output earlier or more sharply than it should.
Importantly, a system does not always stop generating completely when something is wrong. It may continue producing electricity at a lower level, making the problem less obvious without dedicated monitoring and performance review.
Ongoing system management helps the provider distinguish normal changes in generation from issues that may require investigation or maintenance. This makes post-installation support an important part of the commercial solar agreement, rather than an optional service added later.
Under a zero-CAPEX solar PPA, the provider funds, installs, owns, operates, and maintains the solar system. The customer does not purchase the panels or take ownership of the equipment. Instead, it buys the solar electricity generated at the rate agreed in the contract.
Terrenus Energy’s solar PPA structure follows this same model – we handle the installation, maintenance, and operation of the solar energy system at no capital or operational expense to the customer.
This differs from direct ownership. When a business purchases a system outright, it becomes responsible for maintaining the asset. The company may need to build the required expertise internally or appoint an external contractor to inspect, monitor, and repair the system.
A PPA keeps these technical responsibilities with the provider throughout the contract term. This can be particularly useful for businesses that want to adopt solar without creating a new maintenance function within their facilities team.
Note: A PPA works differently from roof leasing in Singapore. Under a PPA, the customer purchases the solar electricity generated. With Terrenus Energy’s roof leasing model, the property owner leases out its rooftop space and earns rental income instead. While the commercials are different, both models ensure that the building owner need not worry about maintaining the solar system – that will be covered by us.
Solar operations and maintenance (O&M) refers to the ongoing work required to keep a solar PV system operating safely, efficiently, and as expected.
While the exact scope should be set out in the agreement, it may include:
These activities generally fall into two main categories: preventive maintenance and corrective maintenance.
First, preventive maintenance involves planned work intended to reduce the likelihood of faults or performance problems. This may include scheduled inspections, cleaning, electrical checks, and reviews of key equipment.
Think of it as a routine health check for the system. By carrying out these activities regularly, the provider can identify early signs of wear, damage, or abnormal performance before they develop into larger issues. It also helps the system generate at its optimal performance.
In contrast, corrective maintenance takes place after a fault or equipment problem has been detected. Depending on the issue, it may involve troubleshooting, repairing the affected component, or arranging a replacement where required.
For example, throughout the PPA term, we manage regular inspections, panel cleaning, performance monitoring and any necessary repairs. Major repairs typically require coordination with a Licensed Electrical Worker (LEW) – a process that can add complexity, but one we handle as part of the agreement, so property owners don’t have to navigate it themselves.
Together, preventive and corrective maintenance help keep the system operating effectively while reducing avoidable interruptions and generation losses. Importantly, this entire process – from routine upkeep to more complex repairs – sits with us and not the property owner.
Visual inspections alone cannot show whether a large commercial solar system is performing as expected. A panel may appear normal while an inverter fault, communication failure or underperforming section reduces electricity generation.
Continuous monitoring gives us a clearer view of system output and performance over time. By comparing current generation with historical data, expected output and weather conditions, we can identify unusual changes and investigate potential issues earlier.
We also give customers access to an online dashboard that monitors system performance in real time, giving clearer visibility of the electricity generated at their facilities.
Access to performance data is only useful when someone has the technical knowledge to interpret and act on it.
Solar systems can continue generating electricity even when operating below expectations. Therefore, without dedicated oversight, gradual performance issues may go unnoticed.
Businesses that own their systems directly may need in-house expertise or an external operations and maintenance (O&M) contractor to manage this work. Under our solar leasing/PPA model, we monitor the system, investigate faults and coordinate the necessary maintenance throughout the agreement.
Since the customer purchases the electricity generated by the system, we also have a direct interest in keeping it operating effectively. While professional O&M cannot prevent every technical issue, it can support more consistent performance by helping us identify and address problems sooner.
Beyond performance monitoring, managing a commercial solar system involves inspections, repairs, warranty claims, safety procedures, technical records and access coordination.
Under our zero-investment solar model for businesses in Singapore, these responsibilities remain with us.
This can reduce our customers’ need to:
Consequently, facilities teams can focus on managing the building, while energy and sustainability teams can track the system’s contribution without becoming responsible for maintaining the equipment.
For businesses considering no upfront cost solar in Singapore, this is an important part of the model’s value. It removes not only the initial investment, but also much of the long-term operational responsibility.
Solar generation naturally changes with sunlight and weather conditions. However, an unexpected or prolonged reduction in output may indicate a technical, communication or maintenance issue.
When we detect unusual performance, our team will:
The appropriate response depends on the cause. For example, we may be able to resolve a communication issue remotely, while an inverter fault may require an on-site technician.
Ultimately, timely fault detection can help limit avoidable generation losses and reduce the risk of a minor issue becoming more disruptive.
The value of a Solar PPA in Singapore goes beyond avoiding the upfront cost of installing the equipment. Throughout the agreement, we also manage the technical and operational responsibilities associated with the system.
For our customers, this can provide:
All these factors can make a PPA more practical than direct ownership for businesses without internal solar expertise. Our customers can use the solar electricity generated while we manage the asset responsible for producing it.
This is why O&M is not a secondary consideration – it’s a core part of what a PPA delivers.
Installing solar panels is only the beginning of a long-term solar project. Throughout its operating life, the system requires ongoing monitoring, inspections, cleaning, maintenance and repairs when necessary.
Under a corporate solar PPA, these responsibilities remain with the provider. This allows businesses to use the solar electricity generated without owning or managing the equipment themselves.
Even a well-designed system requires consistent support after commissioning – which is why long-term O&M is as important to a solar PPA as the system design and electricity rate itself.
Throughout the PPA term, we manage the installation, monitoring, operation and maintenance of the solar system, reducing the technical and operational burden on our customers.
Disclaimer: This article is intended for general informational purposes only and should not be relied upon as technical, engineering, financial, investment, or legal advice.
