Basic Safety Measures and 7 Practical Points for Solar Power Plant Construction

Table of Contents

• Why Safety Measures Are Important in Solar Power Plant Construction

• Prerequisites to Clarify Before Considering Safety Measures

• Practical Point 1: Identify Hazards by Work Stage Before Commencement

• Practical Point 2: Separate Heavy Equipment Routes from Worker Routes

• Practical Point 3: Manage Ground Conditions for Pile Installation and Racking Installation

• Practical Point 4: Reduce Risk of Electric Shock and Short Circuits in Electrical Work

• Practical Point 5: Adjust Work Decisions According to Weather Changes

• Practical Point 6: Close Out Corrective Actions and Records Within the Same Day

• Practical Point 7: Standardize Position Verification and Daily Inspections

• To Prevent Safety Measures from Becoming Mere Formalities

• How to Further Stabilize Solar Power Plant Construction

Why Safety Measures Are Crucial in Solar Power Plant Construction

Safety measures in solar power plant construction are not only intended to prevent worker accidents. They are the foundation that determines the overall quality of the site, the schedule, and stable operation after handover. On sites with weak safety measures, not only do accidents and near-misses increase, but work interruptions, rework, redoing checks, added explanations, and schedule disruptions become more likely. As a result, construction quality itself becomes unstable. In other words, safety measures are both defensive work and proactive management to keep the site moving forward.

At a solar power plant site, similar equipment is laid out over a wide area, so at first glance the work may seem like simple repetition. In reality, however, ground conditions, drainage, the presence or absence of existing structures, the routing of temporary roads, material storage locations, heavy-equipment access, and workers’ movement paths vary from one section to another. Moreover, multiple processes overlap, from pile installation, racking installation, and module placement to wiring, the installation of junction boxes and PCS, testing, and record keeping. As a result, a small error in judgment at one location can easily surface as a major problem in another process. If safety measures are not properly established, the site can become strained even without an accident.

Another reason safety measures for solar power plant construction are difficult is that there is not just one hazard. Multiple risks exist simultaneously, such as heavy machinery accidents, falls, slips, slope collapses, falling materials, electric shock, short circuits, heat stress, strong winds, and deteriorated footing during rainy weather. Moreover, implementing one countermeasure can increase other burdens. For example, prioritizing temporary roads can reduce material storage space, while enlarging material storage areas can lengthen the site’s workflow. Safety measures are therefore not merely responses to individual hazards but balanced designs that maintain the overall flow of the site.

Moreover, safety measures at solar power plants have limits if they rely solely on the intuition of experienced personnel. Seasoned workers can intuitively identify hazardous locations and processes prone to bottlenecks, but if that intuition is not shared across the entire site, the same risks will recur when a different crew or work on a different day carries out the tasks. Therefore, safety measures must be organized not to depend on individual vigilance but as systems that make it easy for anyone to judge in the same way.

On sites that neglect safety measures, work may appear to be progressing on the surface, but in reality many compromises accumulate. Conversely, sites with proper safety measures are less likely to have work stopped, inspections are quicker, and corrective actions tend to be smaller. When considering site management for photovoltaic power plant construction, safety measures are not ancillary tasks that can be postponed. They are a basic requirement that should be designed first and integrated into the work process.

Assumptions to clarify before considering safety measures

To make safety measures effective, you must first clarify the site's underlying conditions. Before identifying hazards, you need to understand which areas carry which processes, which tasks run concurrently, and which movement paths are likely to overlap. Simply listing safety measures based on generalities without looking at site conditions will not work in practice. What is important is accurately identifying the hazards that are truly likely to occur at that site.

What I want to look at first are the terrain and ground conditions. Even on sites that appear flat, there can be hidden conditions such as areas prone to becoming muddy, places where rainwater accumulates, weak topsoil, or instability near the slope shoulder. These conditions directly affect the movement of heavy equipment, temporary storage of materials, workers' movement, and the accuracy of pile installation. When considering safety measures on site, you first need to assess how the ground will be used for each stage of the work.

Next, it is important to organize how work phases overlap. In solar power plant construction, pile installation may progress in one section while mounting structures are assembled in another section, and wiring and equipment installation carried out in yet another. If you do not identify where the movement routes of heavy equipment, workers, and material deliveries intersect, safety measures will become ad hoc. You need not only to create a schedule but also to check how movement routes overlap within the site.

Also, you should align in advance which drawings and which current site-condition information will be used on site. Safety measures are closely related to location checks, section boundaries, distances to existing structures, and the placement of temporary facilities. If drawings are outdated or differences between sections are not organized, even safety-related judgments become ambiguous. If the drawings to be used before work, the location references, and the points requiring attention are organized, that day's hazard prediction will also become practical.

Furthermore, who decides to stop or switch work is also a prerequisite. On-site, when it rains, the wind grows stronger, the ground deteriorates, or another crew's work approaches, it is dangerous if it has not been decided who will stop work and by what criteria. Safety measures do not function with warnings alone. They only become useful when preparations include when to stop, where to resume, and what to recheck. That is why, before considering safety measures, it is necessary to align site conditions, work procedures, drawings, and decision-making authority.

Practical Point 1: Identify hazards for each process before construction begins

The first practical point of safety measures is to identify hazards for each work process before construction begins. At sites, even though hazard prediction activities are carried out daily, accidents and near-misses can be difficult to reduce. This is often because hazards are not linked to specific tasks. Relying only on general precautions makes it hard to see the hazards that are likely to occur on site that day.

For example, in pile installation, hazards include the swing radius of heavy equipment, handling of pile materials, ground settlement, and contact with nearby workers. In mounting-frame construction, problems include temporary placement of components, falling tools, instability due to unsecured items, and awkward postures during alignment checks. In module installation, reduced visibility when carrying, the effects of wind, slipperiness during temporary placement, and an increased likelihood of tripping when moving between rows are common. In wiring and equipment installation, hazards include electric shock, short circuits, incorrect terminal connections, and uneven footing. Thus, hazards differ for each process.

The advantage of identifying hazards by work stage is that countermeasures become more concrete. On the day of pile installation, rather than talking at length about electrocution measures, it is more effective to share the direction of heavy equipment entry and the no-entry zones. On equipment installation days, it is more practical to prioritize confirming that workers do not go under suspended loads and that there is sufficient space for doors to open and close. When identifying hazards, it is important to narrow them down to those that match the day's work rather than increasing the quantity.

Also, this process-specific organization helps share roles among stakeholders. If the hazards that construction managers should monitor, the hazards that heavy equipment operators should watch for, and the hazards that on-site manual workers must pay the most attention to are separated, the team can move beyond a situation where everyone only hears the same message. Because it becomes clear who should be sensitive to which hazards, on-site vigilance tends to improve.

Hazard identification before the start of construction is not a one-time task. It should be reviewed based on differences in conditions by section, changes in the weather, corrective actions taken the previous day, and the progress of other crews. Because solar power plant construction covers a wide area and the work continues over a long period, treating hazards as fixed will diverge from the actual situation. Organizing hazards to match that day’s work and the site conditions for that day is the foundation of safety measures.

Practical Point 2 Separate heavy equipment routes from worker routes

The second practical point is to separate the movement routes of heavy machinery and workers. In solar power plant construction, heavy machinery moves frequently for pile driving, material transport, site regrading, and equipment installation. Meanwhile, there are many processes where people remain for extended periods, such as racking assembly, module installation, wiring, and inspection work. If the two movement routes are unclear, heavy machinery and people will end up competing for the same space on site, which not only increases the risk of accidents but also makes work more likely to be interrupted.

On sites where route separation is not properly implemented, every time a piece of heavy machinery moves nearby workers must step out of the way, interrupting the continuity of work. Furthermore, when work crews have to clear passageways each time material delivery vehicles pass, the rhythm of inspections and construction is disrupted. These waiting times may look like small losses, but when repeated many times across a large site they become significant schedule losses.

As a countermeasure, it is effective not only to separate temporary roads and work zones but also to organize which heavy equipment will enter which zone at which times. Simply securing passageways is insufficient; measures are needed to minimize overlap between the times when people are present and when heavy equipment is operating. Furthermore, rethinking how zones are divided—so that one zone focuses on manual work while another focuses on heavy equipment operations—by changing the arrangement of the processes themselves is also effective.

Also, the separation of movement routes should not be conveyed only by drawings or verbally; it is important to make them visible on-site. If no-entry zones, temporary walkways, delivery waiting positions, and turning areas are clearly defined, even workers entering the site for the first time will find them easy to understand. This not only improves safety but also reduces the burden of on-site training. At sites where movement routes are visualized, unnecessary explanations are reduced accordingly.

Separating the movement routes of heavy machinery and workers is not just for preventing accidents. It is also necessary to maintain the worksite's tempo. If people and heavy equipment do not compete for the same space, inspections, construction work, and deliveries can each proceed more smoothly and consistently. In safety measures for solar power plant construction, this movement-route design plays a crucial role.

Practical Point 3 Manage footing conditions for pile and racking installations

The third practical point is to manage the footing conditions for pile installation and racking installation. In solar power plant construction, attention tends to focus on the accuracy of piles and racking, but in reality the condition of the footing determines that accuracy and safety. If the ground is muddy, slope edges are unstable, access from temporary roads is difficult, or temporary material storage is disorganized, then pile location verification, racking alignment checks, and component handling all become compromised.

Particular attention should be paid to underfoot conditions after rain or when deliveries have been concentrated. Even if there appears to be no obvious problem, some areas may have become prone to sinking, or the surface layer may be disturbed and become slippery. Forcing ahead with pile installation or mounting-frame installation under these conditions may allow work to progress at the time but later reveal inconsistencies in alignment and elevation. As a safety measure, it is necessary to reassess underfoot conditions at each stage of the work.

Also, when managing underfoot conditions, you should consider a worker's standing position together with how loads from heavy equipment are applied. In pile installation, if the orientation of heavy machinery changes the operating radius will also change, and in support-frame installation the way tools are handled and the visibility of components also change depending on where a person stands. It is important to assess not simply whether the ground is hard or soft, but whether the conditions at that location allow the work to be carried out safely.

Furthermore, you need not only to improve underfoot conditions on the spot but also to maintain them. Even if you tidy up a section, the next delivery or rain can disturb it again. If you don't think through which sections to stabilize first, which walkways to prioritize for maintenance, and where not to store materials, underfoot conditions will quickly deteriorate. Assuming conditions will change as construction progresses, they must be managed on a daily basis.

Underfoot conditions for pile and racking installation may seem inconspicuous, but they are directly linked to both site safety and quality. Slippery surfaces, unstable footing, and forced or awkward positioning of heavy equipment on site can lead not only to accidents but also to accuracy defects and rework. Managing underfoot conditions means preserving the prerequisites for construction and is a fundamental safety measure.

Practical Point 4: Reduce the Risk of Electric Shock and Short Circuits in Electrical Work

The fourth practical point is to reduce the risk of electric shock and short circuits in electrical work. In solar power plant construction, processes involving electrical work—such as wiring, junction boxes, around the PCS, and checks during testing—tend to be concentrated in the later stages. Here, hazards different from those in civil works and racking processes emerge. Moreover, because the work can appear to be proceeding quietly, the dangers are less conspicuous. That is why the risks unique to electrical work must be treated as a separate priority.

First and foremost, it is important to make clear which circuit is in which state before starting work. If states such as not connected, temporarily connected, pre-test, under test, and isolated are ambiguous, on-site personnel tend to make “probably okay” judgments. This ambiguity increases the risk of electric shock and short circuits. In sites where many similar wirings run in parallel, such as solar power plants, section labeling and status indication are extremely important.

You must consider not only the wiring and connection work itself but also the surrounding environment. Rain, humidity, wet materials, the condition of temporary walkways, and awkward working postures all increase the risk compared with normal conditions. Safety measures for electrical work cannot rely on equipment alone. It is necessary to assess the environmental conditions on site and determine whether it is safe to proceed. If you are lax in deciding whether to proceed or stop, problems may arise later even if the job appears finished at the time.

It is also essential to perform terminal procedures and post-connection checks on the spot. If you try to review everything together at the end, it becomes difficult to track what was done on which system. Even small mix-ups on site can become major burdens during testing or at startup. Breaking the work into small tasks, verifying each one as you go, and closing out each step as you finish it is ultimately the safest and most efficient approach.

Reducing the risk of electric shock and short circuits in electrical work is not just about protecting workers. It also directly affects subsequent testing, handover, and the prevention of problems after commissioning. In solar power plant construction, this should not be treated as a final finishing touch but should be considered early on as one of the safety measures during construction.

Practical Point 5: Adjust work decisions in response to weather changes

The fifth practical point is to adjust work decisions according to changes in the weather. Solar power plant construction is outdoor work and is greatly affected by the weather. In particular, rain, strong winds, and heat directly affect not only work efficiency but also safety and quality. The problem is not so much the weather changes themselves as the tendency to try to carry on with the same approach used in sunny conditions. On site, there is often a mindset to push ahead even a little, but that can lead to rework or accidents later.

In rainy weather, multiple factors change simultaneously: the ground becomes muddy, surfaces become more slippery, access routes for heavy equipment deteriorate, materials get wet, and conditions for electrical work worsen. In strong winds, handling of long items and modules, the stability of temporarily stored materials, workers' posture, and the safety of suspended loads are affected. In hot conditions, the risks of reduced concentration and judgment errors increase. If you do not decide in advance how much of these changing conditions to tolerate for each process, decisions will be swayed by the on-site atmosphere.

Also, not only the decision to suspend work due to weather but also the decision to resume is important. Rather than restarting immediately when the rain stops, you need to review circulation/access routes, ground conditions, temporary works, the condition of materials, and the conditions of the work before proceeding. If this is left vague, work may have to stop again after resumption, which will further burden the schedule. Weather-related responses should be treated as a change in the work sequence, not on a day-by-day basis.

Moreover, it is important not to leave responses to changing weather to individual judgment. If you clarify which conditions require stopping work, which allow limited continuation, and who has the final authority, site operations will become much more stable. A site that is resilient to weather changes is not one that simply enjoys good weather, but one with consistent decision criteria. In solar power plant construction, this difference impacts both safety and schedule.

Practical Point 6 Close corrective actions and records within the same day

The sixth practical point is to close out corrective actions and records within the same day. One major reason safety measures weaken on site is carrying issues over to the next day. If an observation from one day slips into the next day's corrective action, and the verification of that correction is pushed to yet another day, it becomes unclear who checked what and what remains unfinished. Ambiguity is the most dangerous thing in safety management. That is why anything that can be closed out on the same day should be closed out.

First and foremost, it is necessary to clarify the points being raised on the spot. Rather than saying "It's dangerous, so fix it," you should verbalize exactly what the problem is and what condition will be considered completion. If this is vague, the person who made the correction may believe it's finished while the person checking may still feel it is insufficient. Such mismatches not only lead to repeated checks but also leave safety concerns.

Also, it is important to leave records on the spot. If there are records of which section, which process, what problems occurred, and how they were corrected, the next person in charge will more easily understand the same situation. On site, communication often ends with verbal handover, but at solar power plants where multiple teams operate across a wide area, that can cause information to be lost. Records are needed not for paperwork but to maintain safety.

Furthermore, including confirmation of corrective actions in daily management makes it easier to start work the next day. If it is clear what remained unfinished the previous day and how far things were completed, you can begin the following morning from there without hesitation. Conversely, when the flow between identifying issues and correcting them is broken, every morning starts with re‑explanations. This not only creates losses in the workflow but also tends to lower the quality of safety checks.

Closing out corrective actions and records on the same day does not add work for the site. It is the shortest route to reduce later confusion, rechecks, miscommunication, and the carryover of hazards. In solar power plant construction, precisely because of the large area and the many processes involved, this daily close-out greatly affects the effectiveness of safety measures.

Practical Point 7 Standardize Position Confirmation and Daily Inspections

The seventh practical point is to standardize position checks and daily inspections. In solar power plant construction, there are very many location-related checks, such as pile positions, racking positions, equipment positions, wiring routes, and grounding electrode positions. If these depend on the individual judgment of personnel, one person may decide there is no problem while another feels something is off. This variability leads to rechecks and safety concerns. That is precisely why it is important to standardize the basic flow of position verification.

First, you need to align which drawing to use as the reference, which known points to use, and which positional relationships to prioritize. On sites where drawings exist but the reference to consult differs from person to person, the same location will be checked repeatedly. On sites where position verification is slow, it's not uncommon to spend more time searching for the reference than actually measuring. The first step in standardization is to unify the references.

Likewise, daily inspections are the same. If you set up a fixed order for checking the items that should be looked at every day—such as the condition of heavy machinery, mud on temporary roads, stability of materials, condition of protective equipment, indications on electrical systems, and area access classifications—oversights will be reduced. Rather than leaving daily inspections to individual habits, having the site conduct them in the same order and from the same viewpoints will strengthen safety measures.

Furthermore, standardizing location checks and daily inspections is also effective for people who are new to the site. In solar power plant construction, support workers and different crews often come in, so if operations are run based only on the instincts of experienced personnel, quality can fluctuate. If you create a workflow that makes it easy for anyone to perform the same checks, site stability is less likely to decline even when personnel change. This is also important in terms of maintaining the continuity of safety measures.

Standardizing position checks and daily inspections is not about making the workplace overly rigid. Rather, it is a measure to reduce variability in judgment and to enable the necessary checks to be carried out accurately in a short time. If you truly want safety measures for photovoltaic power plant construction to take root on site, this standardization is an indispensable perspective.

How to Further Stabilize Solar Power Plant Installations

As described above, safety measures in solar power plant construction should include organizing hazards by work phase, separating heavy-equipment routes from worker routes, managing footing conditions around pile foundations and mounting structures, implementing electrocution countermeasures for electrical work, switching operations in response to weather changes, completing corrective actions and records on a daily basis, and standardizing position verification and inspections. Addressing these items makes it easier not only to prevent accidents but also to reduce schedule disruptions and rework. Safety measures should be regarded not as constraints that stop the site, but as conditions that allow the site to operate steadily.

Furthermore, if you want to stabilize the site further, it is useful to adopt the perspective of making position verification itself faster and easier to share. In solar power plant construction, many safety decisions are strongly linked to positional information—such as pile locations, racking locations, PCS locations, wiring routes, and grounding electrode locations. Being able to handle these more clearly reduces back-and-forth checks and explanations and tends to improve the effectiveness of safety measures.

When considering such operations, measures that allow easy on-site incorporation of high-precision positioning—such as LRTK (iPhone-mounted GNSS high-precision positioning device)—are also effective. Being able to clearly verify pile positions, equipment locations, and plot reference points on site makes it easier to correlate drawings with the field and to align the prerequisites for safety measures. If you want to further stabilize solar power plant construction, it is important to improve not only the safety measures themselves but also the positional verification that forms their foundation.