5 Steps to Establish On-site KY in Solar Power Plant Construction

Table of Contents

• Why on-site KY is important in solar power plant construction

• Reasons on-site KY tends to become a mere formality

• Step 1 Separate work zones and processes to specify hazards

• Step 2 Link drawings with site conditions and share them

• Step 3 Separate and manage traffic routes for heavy machinery, materials, and workers

• Step 4 Reflect daily weather changes and electrical work conditions

• Step 5 Close out findings, corrections, and records within the same day

• Tips for embedding on-site KY into operations

• How to further advance solar power plant construction

Why On-site KY Is Important in Solar Power Plant Construction

On-site KY in solar power plant construction is not a formal safety check carried out during the morning meeting. It is the practical work of concretely identifying in advance the hazards that could realistically occur that day within processes such as site preparation, pile installation, rack assembly, module installation, wiring, installation of junction boxes and PCS, and testing, and ensuring safety without stopping work. Solar power plant sites are wide and the same kinds of work are repeated, which easily breeds complacency; however, ground conditions, drainage, heavy-equipment access, distance to existing structures, and the condition of temporary roads differ slightly from section to section. These small differences can greatly change the hazards on any given day.

For example, even pile installation that proceeded safely yesterday may require completely different precautions today regarding the position and stability of heavy equipment and the locations of workers if nighttime rain has loosened the ground. In mounting structure assembly, even when handling what appear to be the same components, the slope and delivery routes have a much greater impact at the edges of a section. In wiring work, processes that posed no problem on dry days may require precautions against electric shock and insulation failures due to humidity or rainfall. In short, KY for photovoltaic power plant construction is not sufficient if it only consists of generalities; it must be made concrete for the section, the process, the weather, and the personnel deployment of that day to be meaningful.

In solar power plant construction, multiple subcontractors often operate simultaneously, and heavy-equipment operations, hands-on tasks, wiring work, and inspection work proceed in parallel on the same site. For that reason, what is routine for one crew can be a hazardous condition for another. For example, temporary material placements made to prioritize delivery can block another crew’s evacuation route. The heavy-equipment access route may also become a workers’ passage. In such environments, it is not enough for individuals to be careful on their own. Crews need to share across the entire site where they will intersect that day and under what conditions risks will increase. That is the true role of KY.

Furthermore, on-site KY is not there solely for safety. A well-functioning KY directly helps prevent process delays and rework. By identifying hazards in advance, it becomes easier to reduce unreasonable scheduling, ad-hoc material movements, and collisions between heavy equipment and people’s traffic routes. Conversely, at sites where KY is merely a formality, even if accidents do not occur, small stoppages, checks, and rework accumulate almost daily. KY is necessary for the site to operate smoothly and make progress.

The value of establishing on-site KY in solar power plant construction lies not in making the site more cautious, but in lightening the site by assuming hazards. Safety and efficiency are not separate things. The more a site’s hazards are visible, the less likely work will be stopped, the shorter explanations become, and the quicker decisions are made. That is precisely why, in solar power plant construction, on-site KY must be treated not as a mere habit but as a practical measure that supports the workflow.

Why On-Site KY Tends to Become a Mere Formality

There are several common causes at worksites where on-site KY does not take hold. The biggest is that the sources of danger are not concrete. Even if you read the same warnings every morning—“watch out for heavy machinery,” “watch for falls,” “watch for electric shock”—if the places or conditions that are truly hazardous in that day’s section are not put into words, they will not stick in workers’ minds. On-site, what is likely to happen right in front of you is more important than generalities. Formal KY becomes a hollow ritual because its content is abstract.

The next most common problem is that the drawings are not linked to actual site conditions. Even if layout plans and working drawings look fine, site conditions such as mud, slope shoulders, existing structures, temporary materials, temporary storage of materials, and drainage flow are present. If this gap is not reflected in KY, workers will act based only on their understanding of the drawings and are more likely to miss site-specific hazards. On-site KY only becomes meaningful when accompanied by a site inspection. If it is completed using only desk-based information, it inevitably becomes detached from reality.

A major cause is also that the roles and sources of hazard for each team are not organized. Even though there are heavy-equipment teams, piling teams, mounting-frame teams, module teams, wiring teams, and personnel responsible for checks, simply giving everyone the same safety brief makes it unclear who should be especially careful about what. For example, the area a heavy-equipment operator needs to monitor is different from the escape routes and access zones that workers at hand must watch. If hazards are not organized by role, everyone ends up saying “let’s be careful” and nothing more.

Furthermore, KY results are hard to take root at worksites where they are not tied to that day's tasks or corrective actions. If hazards are identified but the movement routes remain the same, the material storage area remains the same, and decisions about working in rain do not change, then from the workers' perspective it looks like "just talking." On-site KY is trusted when it is reflected in actual working conditions and layouts. When a hazard is found, change that day's plan or layout even a little. Without this accumulation, KY has no value at the worksite.

Finally, weak recording and sharing are also part of the problem. When near-misses and hazardous spots identified the day before are not carried over to the next day, and sites start from scratch in their discussions every day, the quality of KY is unlikely to improve. On sites like solar power plants, which have many sections and where conditions change slightly day by day, observations from the previous day become important information for the next day. If these are not recorded, the same hazards will be treated as if they are new each time, and KY will not deepen. If you want to establish KY on site, you need not only to put hazards into words but also to accumulate them and hand them over.

Step 1: Divide work sections and processes to identify specific hazards

The first step to establishing on-site KY is to separate the work zones and processes and concretely identify the hazards. In solar power plant construction, viewing the entire site as a single work area makes it difficult to grasp where and what is hazardous on any given day. On a large site, one section may be carrying out pile installation, another may be assembling racking, and yet another may be progressing with wiring and equipment installation; in such a situation the hazards are not singular. That is why you must first divide the site into work zones or sections, and then organize the hazards by each process.

For example, in pile installation zones the hazards include heavy equipment swing, maneuvering of pile materials, ground subsidence, and deviation of the guide position. In support-frame installation zones the major points are temporary placement of components, instability of temporary fixes, movement between rows, and deterioration of underfoot conditions. During module installation there is poor visibility while carrying, wind effects, and an increased likelihood of contact with temporarily stored materials. In wiring zones uneven footing, the risk of electric shock around connection points, and passage crossings with other crews are problematic. In this way, even at the same site, different processes entail different hazards. It is important not to treat these all together.

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Furthermore, organizing hazards by work area and task makes each team's role easier to see. If you know which team is closest to which hazard and when teams are likely to interfere with one another, warnings can be made more specific. This not only improves safety but also helps minimize the extent of work stoppages. The purpose of specifying hazards is not to alarm people on site, but to reduce unnecessary stoppages.

At sites where work sections and processes are viewed separately, instead of repeating the same KY you can briefly share only the hazards that apply to that section on that day. This becomes the initial foundation for establishing on-site KY.

Step 2: Link drawings to site conditions and share

The second step is to link the drawings with the actual site conditions and share them. Even if hazards are made explicit, if it isn’t clear where they correspond on the drawings and where to look on site, each worker will form a different understanding. This is especially true at solar power plants, where repetitive rows and sections mean that saying “the end of the north row” verbally can lead different teams to picture different locations. That is why it is important to connect the drawings with the on-site positions on the spot.

First, what’s necessary is that the day’s work area and hazard locations be identifiable on the drawings. If you can see which section will be constructed, which rows are close to heavy equipment routes, where temporary roads are, and where material delivery routes and worker movement routes intersect, the sharing of hazards becomes much more concrete. If drawings exist but no one on site looks at them, the content of KY will also become disconnected from the actual site. It is important to narrow down the drawings to be used and keep them in a state that is easy to open on site.

Also, changes in site conditions should be overlaid onto the drawings and shared. Changes such as a passage that was passable until yesterday being weakened by rain, the material storage area being relocated, the temporary power supply position being moved, or another crew’s work area expanding are not visible if you rely on the drawings alone. Only by linking on-site changes to an understanding of the drawings does that day’s pre-job risk assessment (KY) become practical. It is important not to consider the as-drawn and as-found conditions separately.

Furthermore, linking the drawings with on-site conditions reduces differences in understanding between crews. One crew may correctly understand the work-zone boundaries, while another may prioritize the temporary road in their perception. These mismatches can lead to misunderstandings about permitted entry areas and errors in evacuation routes. On sites where drawings and the actual site can be viewed together, such mismatches can be reduced quickly. Aligning the positional information that forms the basis for safety management will, as a result, stabilize the entire operation.

Sharing drawings and site conditions is not about producing complicated documents. What matters is that it is immediately clear where and what will be done today and where the hazards are. On sites where this is achieved, the morning KY is not a mere ritual but a time to prepare the day's working conditions.

Step 3 Separate and manage the movement routes of heavy machinery, materials, and workers

The third step is to manage and separate the movement routes of heavy equipment, materials, and workers. On sites where on-site KY does not function well, even if hazards are shared, the actual movement routes are not organized. If the areas where heavy equipment passes overlap with places people frequently walk, or if that day’s temporary material storage narrows the passageways, no matter how much caution is urged the danger will not decrease. That is why the hazards identified in KY must be incorporated into on-site movement-route management.

First, regarding heavy equipment traffic routes, it is important to plan in advance—taking into account the day’s work scope and the locations of other crews—even down to which section you will enter at what time. If heavy equipment access routes also serve as worker walkways, workers will need to clear the area or wait almost every time. This is both a safety issue and a work-efficiency issue. At solar power plants it may look like you can move freely because they are spacious, but in reality the movement routes between sections are often limited.

Next, it is also necessary to consider separating material flow routes. If the delivery routes for modules, mounting-frame members, wiring materials, and equipment overlap with worker walkways, visibility during work deteriorates and the risk of contact or trips and falls while carrying materials increases. Especially on days when long members or large-area components are handled, the person carrying materials will have a narrowed field of view, so walkway design is part of safety measures. You need to be conscious of changing temporary storage locations and transport routes to match that day’s schedule.

Workers' movement routes are not simply about having a walkable path. You need to consider places to retreat to, vantage points that make inspection easy, and spots where workers will stop during checks. On site, merely having a safe escape route can change workers' sense of security. Conversely, if the routes are ambiguous, standing in hazardous locations can easily become the norm. Rather than simply raising awareness through KY, it is important to change the routes themselves.

Managing separate traffic flows for heavy equipment, materials, and workers is not about adding more rules at the worksite. It is about giving hazards a tangible form so that anyone can see and understand them. In solar power plant construction, simply having this traffic-flow design makes it easier for the morning KY to directly lead into site operations.

Step 4 Reflect daily weather changes and electrical work conditions

The fourth step is to reflect daily changes in weather and electrical work conditions. In solar power plant construction, rain, strong winds, heat, and humidity have major impacts, and moreover the way those impacts appear varies by section across the large site. Nevertheless, at sites that simply repeat the same KY as the previous day, the hazards of the day cannot be fully captured. If you want to establish on-site KY, you need to reflect that day's weather and work conditions every day.

First, changes in footing conditions during rain and on the following day should always be reassessed. A passage that was safe to walk yesterday may be hazardous with mud today. A section where heavy equipment was stable may be prone to localized sinking this morning. Such changes are very likely to occur on site. That is why it is necessary to concretely define the effects of weather for each work phase and to share the criteria for stopping work and the conditions for switching sections.

Also, for electrical work, weather and humidity affect both quality and safety. Wiring connections, terminal work, and tasks around equipment that could be done on a dry day cannot necessarily be done the same way today. Wet environments, wind, and deteriorated footing conditions not only increase the risk of electric shock and short circuits, but also affect workers’ posture and the accuracy of their checks. Don’t leave this as a general warning about electric shock; it’s important to communicate it in relation to the specific conditions of the day.

Furthermore, reflecting weather changes is tied to decisions about stopping work. If it is clear under which conditions work should be stopped, under which conditions operations should be switched to another process, and who is responsible for making those decisions, the site will find it easier to avoid hesitation. Rather than the simple judgment of stopping because it is raining and resuming because it has stopped, it is necessary to review daily which sections, which processes, and under what conditions can be operated.

Taking into account weather changes and electrical work conditions does not mean making the site overly cautious. Rather, it reduces accidents and rework caused by continuing despite unsafe conditions, and clarifies the scope of work that may be progressed that day. At sites where this is implemented, KY is more likely to function as part of process management.

Step 5 Close findings, corrective actions, and records within the same day

The fifth step is to close out the pointing out, corrective action, and recording within the same day. At worksites where on-site KY has not become established, even if hazards are raised, subsequent actions are often weak. If things end with "let's be careful" and it remains unclear within the same day what will be fixed, what will be left as is, and how it will be handed over, the next day you will have to explain the same hazard all over again. This way, KY will not lead to improvements on the worksite.

The first thing you need to do is put the issue into concrete words. Rather than saying “be careful, it’s dangerous,” you must clarify which zone, which flow of movement, and which process are intersecting, and what exactly is hazardous. Moreover, it is important to decide how to fix that hazard so work can proceed the same day. For example, you need to make it actionable on site—such as shifting temporary storage, separating walkways, clearly marking no-entry areas, or changing the sequence of tasks.

It is also important to determine the criteria for completion of corrective actions on the spot. If it is unclear who will verify and what condition will be considered acceptable, the person who carried out the corrective action and the person who inspects it will have different understandings. As a result, the same location may need to be checked again the next day, increasing the burden on the site. This is both a safety management issue and a process management issue.

Furthermore, by recording them on the same day, the previous day's hazards become assets for the next day. If it is recorded which section had what problem, how it was corrected, and which conditions should be watched next time, the next day's KY will be one step deeper. Conversely, at sites where things end with verbal reports, the same hazards are treated every day as if they were being encountered for the first time. At sites like solar power plants, where there are many sections and similar tasks are repeated, this accumulation makes a very large difference.

Closing out observations, corrective actions, and records on the same day does not create extra work. It is a way to avoid carrying hazards over to the next day and to reduce the burden at the worksite. If you want to establish KY at the workplace, making this method of closing part of your daily routine is essential.

Tips for embedding on-site KY into operations

To establish on-site KY, it is important not to demand a perfect form from the start. At a large solar power plant site, it is not realistic to cover every hazard every day. Rather, focusing briefly and concretely on only the hazards that are truly important for the current task, the specific section, the weather, and the crew composition will make it easier for the practice to take hold on site. Short, site-specific KY that resonates with the workforce is more effective than long, abstract KY.

Also, it is important to directly turn on-site feedback into improvements. When a worker says, "This spot is slippery," "This materials storage area is dangerous," or "This passage is prone to collisions with heavy machinery," a site that does not let those comments end as mere warnings but reflects them in that day's layout and traffic flow is strong. Conversely, if nothing changes on site even after people speak up, KY tends to become nothing more than talk. To make it stick, KY needs to build up experience in actually changing the workplace.

Furthermore, it is important not to make it a forum where only team leaders and construction managers speak. Those on the front lines of the site notice hazards sooner. Section-specific oddities, unease when carrying items, the precarious way heavy machinery comes close, and differences in footing conditions compared with the previous day are hard to see without the perspective of the people actually doing the work. On sites where on-site KY takes hold, the environment becomes one where people can speak up, not just listen.

In one sentence, the key to this practice is to make KY not part of the morning meeting but the starting point for changes on site. Hazards become visible, workflows change, layouts change, records are kept and used the next day. Once this flow is established, KY will naturally take root. On solar power plant construction sites, the accumulation of these small improvements makes a significant difference in safety.

How to Further Stabilize Solar Power Plant Construction

As we've seen, to establish on-site KY in solar power plant construction it is important to specify hazards by work zone and process, link drawings with site conditions, separate the traffic flows of heavy machinery, materials, and workers, reflect weather changes and electrical work conditions on a daily basis, and close out observations, corrective actions, and records within the same day. By ensuring these points, KY becomes a practical measure to keep the workflow moving rather than a mere formality. In fact, the stronger the safety measures at a site, the more stable the construction process.

If you want to further stabilize the site, making the position checks that form the basis of hazard prediction easier to understand is also effective. In photovoltaic power plant construction, there are many decisions related to position, such as pile locations, racking positions, plot boundaries, equipment locations, wiring routes, and grounding rod locations. Even when sharing hazards in on-site KY, if it is not clear which location is being discussed, alerts will not be specific. That is why creating a situation in which position confirmations can be quickly shared on site also helps improve the quality of KY.

When considering such operations, measures that allow high-precision positioning to be incorporated in a form that is easy to handle on site—such as LRTK (iPhone-mounted GNSS high-precision positioning device)—are also effective. When pile locations, equipment positions, and layout benchmarks can be easily confirmed on the spot, matching drawings to the field becomes faster, and sharing information about hazards can be advanced more concretely. If you want to further stabilize solar power plant construction, it is important to improve not only KY practices but also the prerequisite step of position verification.