Why Solar Power Plant Prices Are Falling and 7 Points to Check

Table of Contents

• Importance of understanding why the price of a solar power plant is falling

• Reason 1: Power generation performance has declined

• Reason 2: Power sales terms and the remaining contract period have weakened

• Reason 3: Equipment deterioration and scheduled repairs exist

• Reason 4: There are concerns about land conditions and property rights

• Reason 5: The burden of maintenance costs and on-site operations is high

• Reason 6: There are risks related to disasters, drainage, and the surrounding environment

• Reason 7: High uncertainty due to insufficient documentation and discrepancies with on-site conditions

• Practical judgment when considering properties with reduced prices

• Summary: Verify the reasons for price decline with on-site evidence

The Importance of Understanding Why the Price of Solar Power Plants Is Falling

For personnel responsible for evaluating the purchase or acquisition of solar power plants, properties whose prices have fallen can look attractive. Among power plants that appear to have similar installed capacities and power sale conditions, if one is offered at a lower price than others, you are likely to want to consider it more favorably in internal approval processes and investment decisions. However, there is always some reason behind a lower price for a solar power plant. If you make a decision without checking that reason, unforeseen repairs, reduced power generation, land disputes, and increased management burdens may arise after purchase, and you could end up losing money.

Solar power plants are not merely facilities; they are business assets that integrate power generation equipment, land, power sales terms, generation performance, management structure, contractual relationships, and the local environment. There is not a single reason why a price falls. Sometimes the generation performance has declined, and sometimes the power sales period has been shortened. Various factors affect the price, such as equipment deterioration or scheduled repairs, land rights issues, drainage and vegetation management, and insufficient documentation.

What matters is not avoiding properties whose prices have dropped. It is about correctly identifying the reasons for the price decline and judging whether those reasons are acceptable, can be remedied, or can be incorporated into a post-acquisition management plan. Even properties that appear cheap are worth considering if the risks are clear and a response strategy can be established. Conversely, properties whose prices have fallen for unknown reasons should be treated with caution.

Operations staff who search for "solar power plant price" are not looking for superficial cheapness but for the reasonableness of the price. If they cannot confirm why prices are falling, which risks are being priced in, and what burdens will arise after purchase, it will be difficult to make a convincing case within the company. This article explains the main reasons why solar power plant prices fall and breaks down the checkpoints into seven items. Rather than specific amounts, it is organized as practical criteria you can use to assess prices.

Reason 1: Power generation performance has declined

The easiest-to-understand reason for a drop in the price of a solar power plant is a decline in its actual power generation performance. The value of a plant is determined not by installed capacity itself but largely by how stably it actually generates electricity. Even if the installed capacity appears large, if the amount of electricity generated is not increasing, its valuation as a business asset tends to decline.

When checking power generation performance, do not judge solely by the annual total. Even if there appears to be no major problem on an annual basis, looking at monthly data may reveal significant drops during specific periods. Reductions in generation can be related to site-specific causes such as weeds growing in summer casting shadows on panels, surrounding trees or terrain casting longer shadows in winter, the effects of snow or fallen leaves, or equipment shutdowns and inspection stoppages.

Trends over multiple years are also important. Whether the power generation is low in only a single year, gradually declining year by year, or suddenly dropping from a particular period will change what needs to be checked. If it is gradually declining, possible causes include aging deterioration of equipment, dirt on panel surfaces, growth of surrounding trees, insufficient vegetation management, and deterioration of wiring and connection points. If there is a sudden decline, it is necessary to check for possibilities such as failure of major equipment, long-term shutdowns, poor monitoring, and output control.

For properties with reduced prices, the drop in power output may already be reflected in the price. In such cases, what should be checked is whether the cause of the decline can be remedied. If it can be improved by mowing, cleaning, or minor equipment repairs, it may be possible to consider the purchase with the expectation of addressing the issue afterward. On the other hand, if the cause is persistent shading from terrain or neighboring trees, poor drainage due to land conditions, or overall system deterioration, it may not be easy to remedy.

Also, it is necessary to verify the reliability of the power generation performance data itself. If the monthly data have gaps, shutdown histories are not explained, reasons for anomalous values are unknown, or monitoring data are not sufficiently organized, uncertainty will remain in future power generation forecasts. If power generation performance could be related to the reason prices are falling, it is important to check not only the reported figures but also the site conditions and the operations and maintenance history that underpin those figures.

Reason 2: Electricity sales conditions and the remaining contract period have become less favorable

One major reason why the price of a solar power plant drops is the effect of the power sale conditions and the remaining contract period. Because a plant earns revenue by selling the electricity it generates, the terms under which it can sell power and how much time is left on those terms are important factors in price assessment. For used solar power plants, a certain period has already passed since they began operation, so the shorter the remaining period, the more limited the future revenue opportunities.

When checking the conditions for selling electricity, organize the contract terms, the start date of operations, certification-related information, procedures with the power company, and the requirements for change of ownership or succession. Even if the documents appear to show no problems, if there are discrepancies in the location, equipment capacity, registered owner, or contract terms, additional verifications or procedures may be required after acquisition. Properties with such uncertainties may be priced lower for that reason.

For properties with a short remaining period, you need to consider not only the prospects for future revenue but also the balance with repair and maintenance burdens. If the remaining period is limited yet major equipment replacements or significant repairs are imminent, the impact on operational plans can be substantial. A lower price does not necessarily mean an advantage; you must carefully determine whether the property can reliably generate electricity during the remaining period and to what extent repairs should be carried out.

On the other hand, if the price is falling despite a long remaining term, there may be other hidden risks. You need to check factors such as unstable power generation records, accelerated equipment degradation, uncertainties in land contracts, high operation and maintenance costs, and restrictions related to output curtailment or grid interconnection conditions. Rather than taking comfort from the remaining term alone, it is important to confirm that the conditions are in place to actually operate during that period.

Output curtailment and interconnection conditions should also be checked. Even if generation equipment is capable of operating sufficiently, limitations on opportunities to sell electricity will affect forecasts of generation and revenue. Check how past curtailment records and outage histories are reflected in generation performance, and whether they have been priced in.

Feed-in terms and the remaining contract period cannot be judged by appearance alone. Only by checking contract continuity, succession procedures, generation performance, equipment condition, and future repairs together can you correctly understand the reasons the price is lower. The more a property appears to be priced low, the more carefully you need to check whether the feed-in terms align with the actual situation.

Reason 3: Equipment deterioration or planned repairs

Equipment deterioration and planned repairs are also major reasons why the price of a solar power plant falls. Because a plant operates outdoors for long periods, solar panels, mounting racks, foundations, wiring, connection equipment, power conversion equipment, monitoring devices, fences, drainage systems, and so on gradually deteriorate. Even if the plant is operational at the time of purchase, if repairs are needed immediately after acquisition, the practical burden becomes significant.

During facility inspections, it is necessary to inspect the entire solar power plant, not just the solar panels. Check for cracks, discoloration, or dirt on panel surfaces; loosened fasteners; corrosion of the racking; settlement or scour around foundations; damage to cable sheathing; deterioration of connections; ventilation around equipment; and damage to fences or gates, and so on. Even plants that look orderly from a distance may have problems in areas hidden by vegetation or on the backsides of equipment.

Inspection reports and repair histories are also important. Verify what kinds of malfunctions occurred in the past and when and how they were addressed. The mere fact that a failure occurred is not necessarily a problem. Power plants that detect abnormalities, identify their causes, carry out appropriate repairs, and document measures to prevent recurrence are easier to evaluate in terms of their management condition. What is problematic is when identified issues remain unaddressed or the repair descriptions are ambiguous.

In properties where the price has been reduced, there may be outstanding repairs that have not been addressed. For example, repairs to fences and gates, cleaning of drainage channels, protection of cables, repairs around mounting frames, and review of monitoring equipment may be required, and you need to confirm who will bear those costs. Whether the seller handles them before handover or the buyer addresses them after purchase will change how the price is perceived.

You should also verify the quality of inspection reports. Even if a report exists, if the locations of photos are unclear, the findings are vague, there is no record of corrective actions, or the relationship to a decline in power generation is not explained, uncertainty about the equipment’s condition remains. For assets with high uncertainty, additional investigation or adjustment of conditions may be required.

Equipment degradation affects not only power output but also safety. Damage to cables or faults at connection points can cause shutdowns or overheating. Deterioration of mounting racks and foundations increases risk during strong winds or heavy rain. Damage to fences can lead to intrusion by third parties or animals. If falling prices are due to equipment degradation, it is important to view this not merely as a repair-cost issue but as a risk to power generation continuity and safety management.

Reason 4: Concerns about land conditions and property rights

One reason why the price of solar power plants falls is concerns about land conditions and land-rights issues. Even if the generation equipment and power‑purchase terms look favorable, if the land cannot be used stably, significant risks remain for long‑term operation. Solar power plants are businesses operated on land, and the condition of the land and the contractual terms directly affect the price.

First, what you should check is the land use type. Confirm whether the land is owned or leased, whether the land-use contract period is sufficient, and what the renewal and termination conditions are. In the case of leased land, if the land-use rights are not adequately secured for the power sales period and the planned operation period, future business continuity could be jeopardized. If there are multiple landowners or the contracts are divided into several agreements, the burden of coordination can also increase.

Checking the boundaries is also important. Confirm that fences, panels, mounting racks, drainage channels, maintenance access paths, and cable routes are contained within the site. Even if the drawings appear to show no issues, on-site there may be unclear boundary markers, ambiguous borders with neighboring properties, fences installed near the boundary, or drainage channels that involve neighboring land. If there are uncertainties about the boundary, adjustments with neighbors or additional verification may be required after purchase.

Road access conditions can also be a reason for a price reduction. We check not only whether a person can enter for routine inspections, but also whether service vehicles can enter for grass cutting, cleaning, equipment replacement, and disaster recovery. Conditions such as a narrow access road, unclear right of way, muddiness in rainy weather, or lack of a vehicle turnaround affect maintenance costs and recovery response. At power plants with poor access, response to abnormalities may be delayed and the period of power generation shutdown may be prolonged.

Drainage and topography are also part of the site conditions. On sloping terrain or developed land, check the flow of rainwater, inflow of sediment, slope stability, and blockage of drainage channels. On land with poor drainage, scouring around foundations, weakening of the ground, impacts on cables and electrical equipment, and deterioration of maintenance access paths may occur. These risks affect post-purchase maintenance and repair costs.

Issues concerning land conditions cannot be as easily changed or replaced as equipment. Boundaries, road access, agreements with land rights holders, and drainage routes require coordination with the relevant parties. Therefore, for properties with reduced prices, it is necessary to confirm at an early stage whether uncertainties regarding the land are the reason for the lower price.

Reason 5: High burden of maintenance costs and on-site response

One reason the price of solar power plants falls is that maintenance costs and the burden of on-site responses can be significant. A plant is not an asset that ends with purchase; it requires long-term inspections, generation monitoring, grass cutting, cleaning, repairs, drainage management, and emergency response. Plants that are time-consuming to manage may appear cheap on the surface but can become a heavy burden when considered over the entire operational period.

Maintenance and management include regular inspections, checks of electrical equipment, generation monitoring, mowing, weed control, cleaning, inspection of drainage channels, repair of fences and gates, management of surrounding trees, and on-site response in the event of abnormalities. The burden of these tasks varies depending on the power plant’s location and the condition of its equipment. The ease of management can differ greatly between a power plant that is flat and easy to access and one located in forested or sloping terrain, even when they have the same equipment scale.

When reviewing past maintenance and management costs, do not regard low expenses alone as a positive sign. Low costs may indicate that necessary inspections, mowing, drainage management, and repairs were not carried out adequately. When examining past costs, verify the scope of work, frequency, reports, and on-site condition together to determine whether appropriate management was performed. If insufficient management has caused equipment deterioration or a decline in power generation, this is an important factor that can lead to a price reduction.

The burden of vegetation management is also a point to check. On land where weeds grow easily, the frequency of mowing increases. If surrounding trees are close, there are risks of shading, fallen leaves, encroaching branches, and tree fall. Vegetation casting shadows on panels affects power generation, and if it becomes overgrown around wiring and connection equipment it can hinder inspections and safety management.

The ease of on-site response is also important. Even if an anomaly is detected, at power plants where it takes time to reach the site, downtime may be prolonged. Conditions such as narrow access roads, limited workspace, muddy conditions in rainy weather, and difficulty arranging personnel at remote locations increase the burden of emergency response.

Also review the contents of the management contract. Check to what extent the inspection scope, emergency response, grass cutting, cleaning, power generation monitoring, report preparation, and the communication system for abnormalities are included. Even if the contract appears to provide management, small on-site issues may be overlooked. It is also necessary to confirm whether the reports actually lead to improvements and whether the issues raised are not being left unaddressed.

Maintenance and on-site response burdens are not easily reflected directly on a price list. However, they can make a significant difference in long-term operation. For properties with lower prices, it is important to check whether difficulties in management or on-site response lie behind this.

Reason 6: There are risks from disasters, drainage, and the surrounding environment

Risks from disasters, drainage, and the surrounding environment are also reasons why the price of a solar power plant may be reduced. Because solar power plants are installed outdoors, they are exposed to rain, wind, snow, landslides, lightning strikes, fallen trees, wildlife damage, weeds, and other impacts. If there are concerns about the local environment, this can lead to reduced power generation, equipment damage, increased operation and maintenance costs, and delays in recovery responses.

The first thing to check is drainage. Confirm where rainwater flows in from and where it flows out. Even if there are drainage channels, if they are prone to clogging with sediment, fallen leaves, or weeds, regular cleaning will be required. Poor drainage can cause scouring around foundations, weakening of the ground, adverse effects on cables and electrical equipment, and deterioration of maintenance walkways.

On sloped or developed land, also check for sediment inflow and the condition of slopes. At power plants where sediment flows in with every heavy rain, the burden of cleaning and repairs increases. If there are signs of cracking or collapse on a slope, it is necessary to consider the risk of future repairs. These land-related problems, separate from the performance of the equipment itself, can be factors that lower the price.

The impact of surrounding trees and vegetation is also important. At power plants with nearby trees, there are risks of shading, fallen leaves, overhanging branches, and falling trees. Trees that posed no problem when operations began can grow over the years and affect power output. In winter, when the sun is lower in the sky, trees located farther away can also cast shadows.

Ease of recovery after a disaster is also something to check. If there has been damage in the past from heavy rain, strong winds, snowfall, fallen trees, or the like, confirm the details and the restoration status. The fact that damage occurred is not necessarily a problem in itself, but if the cause has not been remedied, the risk of recurrence remains. Whether the site can be accessed immediately, whether service vehicles can reach it, and how easily the damaged areas can be identified will affect downtime and the burden of restoration.

For properties with reduced prices, it is necessary to confirm whether such on-site risks have been adequately explained. Even if the documents appear to show no major issues with power generation performance, when you visit the site you may find clogged drainage channels, sediment accumulation, shading from trees, overgrowth of vegetation, warped fences, and the like. Disaster and surrounding environmental risks should be viewed not only in terms of the current price but also as future management burdens.

Reason 7: High uncertainty due to insufficient documentation and discrepancies with on-site conditions

One reason solar power plant prices fall is the uncertainty caused by insufficient documentation and discrepancies with the site. To assess a plant’s value, information such as power generation records, power purchase terms, land contracts, drawings, inspection reports, repair history, management contracts, and on-site photos is required. If these are lacking or the documents do not match the on-site condition, it becomes difficult to gauge the risks after purchase.

The first thing to check is the consistency of the project documentation. Confirm whether items such as equipment capacity, location, land area, start of operations, owner, scope of management, and equipment configuration are consistent across multiple documents. In the case of a used power plant, documents may not have been updated due to past ownership transfers, equipment repairs, or changes in the management company. If there are inconsistencies in the documentation, additional administrative and management checks may be required after acquisition.

Verifying the drawings against the site is also important. Confirm that the panel layout, mounting structures, equipment, fences, gates, drainage channels, maintenance access routes, and boundary lines shown on the drawings match the actual site. Repairs or changes made during operation may have altered the site compared with older drawings. If there are discrepancies between the drawings and the site, it is necessary to clarify the reasons and the current correct condition.

Also check the quality of inspection reports and on-site photographs. Even if photographs are available, it becomes difficult to deal with them later if it is not clear where they were taken. Damaged areas, locations of drainage failures, causes of shading, the extent of vegetation growth, and points to check near boundaries should ideally be recorded together with their positions. If reports are formalistic and the items raised or the history of corrective actions are unclear, it becomes difficult to grasp the actual conditions on site.

For properties with insufficient documentation, the reason for a lower price may not be clear. It is not necessarily cheap because the risk is low; the valuation may be reduced because the risks cannot be confirmed. In such cases, it is important to request submission of additional documents, on-site surveys, specialized inspections, boundary confirmation, and organization of management history.

When evaluating properties with high uncertainty, assess not only the price but also the verification work and management burden required after acquisition. Power plants with complete documentation may appear slightly more expensive, but they can be easier to evaluate and easier to manage after handover. Insufficient documentation and discrepancies with on-site conditions are important factors that affect price as hard-to-see risks.

Practical decision-making when considering properties whose prices are likely to fall

When considering solar power plants whose prices have dropped, it is important not to focus on the low price itself but to categorize the reasons for the discount. Check separately whether it is due to a decline in generation performance, power purchase conditions or remaining contract period, equipment degradation, land conditions, operation and maintenance costs, disaster risk, or lack of documentation. Once you know the reasons, it becomes easier to judge whether the risks can be managed.

First, separate reasons that can be improved from those that are difficult to improve. Issues such as insufficient mowing, inadequate cleaning, minor equipment repairs, and poor document organization can often be improved through appropriate measures. On the other hand, heavy shading, poor road access, unclear boundaries, restrictions in land contracts, terrain-related drainage problems, and the complexity of rights and ownership may not be easily resolved. It is important to determine which category the reason for the price decline falls into.

Next, consider whether your operational setup after acquisition can handle it. If your in-house team or an outsourced partner can adequately perform on-site management, you may be able to proceed by factoring in a certain level of management burden. However, if the property is remote and on-site response is difficult, coordination with the management company is weak, or emergency response arrangements are not in place, even small risks can lead to large losses.

In internal presentations, rather than simply presenting a lower price as a benefit, you need to show that you have confirmed the reasons for the low price. By organizing which risks exist and which risks are acceptable, what repairs and management costs are anticipated, and which items require further verification, the transparency of decision-making is enhanced.

Also, for properties with reduced prices, consider the possibility of negotiating terms. Negotiation is not simply about lowering the price further. It is also important to reduce post-acquisition uncertainty by carrying out repairs before handover, submitting additional documents, confirming boundaries, supplementing inspection reports, transferring management, and addressing on-site risks.

Properties priced low can be an option if the risks are understood. However, choosing one without understanding why can lead to unexpected problems piling up after purchase. Operational staff should not simply view low price as attractive; it is important that they adopt an attitude of verifying the reasons for the low price.

Summary: Verify the reasons prices are falling with on-the-ground evidence

The reasons for a decline in the price of a solar power plant include reduced power generation performance, weak power purchase conditions and remaining contract periods, equipment degradation, concerns about land conditions, heavy operation and maintenance costs, on-site risks such as disasters and drainage, and insufficient documentation or discrepancies with the site. By checking each of these items one by one, it becomes easier to decide whether to consider a property whose price has fallen.

Properties with falling prices are not necessarily bad properties. If the reason for the low price is clear, the risks are remediable, and they can be incorporated into a post-acquisition management plan, they may be practically considered. On the other hand, if the reason for the low price cannot be explained, documentation is insufficient, on-site risks are significant, or there are many uncertainties regarding the land or rights, careful verification is required.

What's particularly important is to verify the actual on-site conditions, not just rely on desk-based materials. The reasons for reduced power generation performance may be related to shading, vegetation, drainage, equipment deterioration, property boundaries, or road access. Even if there is an inspection report, additional verification is necessary when the locations in the photos are unknown, there is no record of corrective actions, or the drawings do not match the site.

During on-site inspections, it is important not only to take photographs but also to accurately record where and what kinds of risks exist. If you record equipment near boundaries, drainage channels, trees that cause shadows, the extent of vegetation growth, cable damage, fence damage, sediment accumulation, and locations requiring repair along with location information, those records will be easier to use for internal reporting, instructions to management companies, and repair estimates.

If you want to accurately verify on site the reasons why a solar power plant's price has fallen, using LRTK (an iPhone-mounted GNSS high-precision positioning device) can also be effective. If you can record inspection points within the plant together with high-precision location information, it becomes easier to share among stakeholders the discrepancies between the drawings and the site, drainage and shading risks, locations of equipment deterioration, and points to watch near the boundaries. When considering properties whose prices have fallen, it is important not to focus solely on the low price but to make a decision by accumulating evidence that can be confirmed on site.