What Causes a Sudden Drop in Power Output? 7 On-site Points to Check

When the power output of a solar power plant suddenly drops, it is necessary to quickly determine on site whether it is a fault, a weather effect, or an equipment abnormality. In particular, if there were no major problems until the previous day but the output fell starting on a certain day, it is important not to fixate on a single cause but to check, in order, insolation, shading, soiling, equipment stoppage, wiring, communications, and settings.

If a low level of power generation is left unaddressed, it can lead not only to reduced electricity sales and self-consumption but also to long-term outages from missed abnormalities, delays in inspection responses, and inconsistencies in reporting materials. On the other hand, declines in generation can include temporary variations caused by weather or measurement conditions rather than actual equipment faults. Therefore, on-site it is important not to look only at the result that output is “low,” but to distinguish over what range, during which time periods, and to what extent the decrease is occurring.

This article整理s seven on-site checkpoints for field personnel who search for "low power generation" to investigate the causes. From initial checks for a decline in power generation to solar irradiance conditions, shading, panel soiling, equipment shutdowns, wiring abnormalities, and how to interpret communication data, each item is explained in an order that is practical for field use.

Table of Contents

• When power generation suddenly drops, first align the comparison conditions

• Point 1 Check changes in solar irradiance and weather

• Point 2 Look for shading occurrence and time-of-day bias

• Point 3 Inspect panel surfaces for dirt and deposits

• Point 4 Check for stoppage of power conditioners and junction boxes

• Point 5 Look at variations in voltage and current at the string level

• Point 6 Check for discrepancies between communication data and on-site displays

• Point 7 Review recent work history and setting changes

• Approach to isolating causes of low power generation on site

• Summary It is important to eliminate causes of generation decline one by one

When Power Output Suddenly Drops, First Standardize the Comparison Conditions

When you notice a sudden drop in power generation, the first thing to check is whether the conditions you are comparing are the same. Solar power output can vary greatly even with the same system capacity, depending on the season, weather, temperature, solar irradiance, shading, and downtime. Therefore, simply observing that it is “less than yesterday” or “lower than last month” is not enough to correctly determine whether there is an equipment fault.

The first thing to check is whether the output is lower compared with days of similar weather, lower despite being a clear day, or lower due to the effects of rain or clouds. In solar power generation, when solar irradiance is low, generation is also low. On cloudy days, rainy days, days with heavy haze, or when yellow dust or smoke are present, solar irradiance can be reduced more than it appears. Even if the sky looks bright, if direct solar irradiance is weak, generation will have difficulty increasing.

Next, it is also important to align the comparison periods. When looking at daily power generation, the operating hours from sunrise to sunset change with the seasons. Compared with summer, winter has shorter sunlight hours and a lower solar altitude, so even under the same clear skies generation tends to be lower. In locations where morning and evening shadows extend more easily, generation can drop only during winter. If you apply the same criteria year-round without considering these seasonal factors, you risk mistaking normal variation for an anomaly.

To determine whether a drop is sudden, check not only the daily total generation but also the generation curve by time of day. On a near-normal sunny day, generation typically rises from the morning, peaks around midday, and then falls toward the evening, forming a bell-shaped pattern. By contrast, patterns such as output being low only in the morning, only in the afternoon, suddenly dropping at midday, or becoming nearly zero from a certain time can help narrow down the cause.

We also confirm early on whether the entire power plant is underperforming or only certain circuits. If the whole plant is declining by the same proportion, candidate causes include weather, solar irradiance, output control, grid-side conditions, and anomalies in the aggregation of monitoring data. Conversely, if only some power conditioners, some strings, or some sections are underperforming, we suspect localized on-site factors such as equipment outages, wiring faults, shading, soiling, or poor connections.

Even when people say "low power generation," there is not a single cause. At the site, it is important first to verify whether the drop in power generation is truly an abnormal value, and then to clarify the extent of the drop, the time of day, its persistence, and its relationship with the weather. If you assume equipment failure without this initial assessment, it can lead to unnecessary inspections or parts replacements. Conversely, if you assume it's due to the weather and postpone verification, you risk overlooking an actual shutdown or a disconnection.

Therefore, in the initial stage of a drop in power generation, it is fundamental to check the comparison with past days under the same conditions, the shape of the generation curve, variations within the equipment, and the consistency between on-site displays and monitoring data. By aligning these premises, the following seven checkpoints will be more effective.

Point 1 Check solar irradiance and weather changes

When power generation suddenly drops, the first things to check are changes in solar irradiance and the weather. Because solar power generation depends on incoming solar radiation, a decrease in irradiance leads to a decrease in output. This is a basic point, but it can be overlooked in the field. In particular, even on days when the sky appears bright, if thin clouds spread, humidity is high and creates haze, or yellow sand or dust weakens the sunlight, generation may not reach expected levels.

When inspecting, check not only the power generation but also the pyranometer readings, nearby meteorological information, and the sky conditions at the site. If a pyranometer is installed, verify whether the drop in power output and the drop in solar irradiance occur at the same time. If power output is low during periods of low irradiance, it is more likely due to weather rather than an equipment fault. Conversely, if irradiance is sufficient but only the power output is low, an equipment-side problem should be suspected.

Temperature effects cannot be ignored either. Solar panels generally tend to produce less power as module temperature rises. Even on sunny days with strong solar irradiance, high temperatures in midsummer can cause output to fall short of expectations. Therefore, when generation does not increase as much as expected despite clear skies, check not only the irradiance but also the influence of temperature. However, temperature-related reductions usually do not manifest as a sudden drop toward zero; they more often appear as an overall suppression of output growth. If there is a sudden plunge or a decrease only in a particular circuit, investigate other possible causes as well.

When interpreting the weather, be careful not to judge based only on the daily weather. Even if the forecast is sunny, there can be many clouds only in the morning, clouds passing around midday, or rain clouds in the evening. When the daily total power generation is low, compare the generation curve by time of day with weather changes. If the generation curve shows many small fluctuations, consider variations caused by passing clouds. On the other hand, if the output suddenly drops from a certain time and does not recover, it may be due to equipment shutdown or protective operation.

Additionally, there can be temporary reductions in solar irradiance due to the surrounding environment. If construction is taking place nearby, airborne dust can weaken solar irradiance. In mountainous areas or along the coast, fog or salt-laden air can alter solar conditions. In snowy regions, even if the sky is clear, power output can drop significantly if snow remains on the panels. After rainfall, dirt may be washed away, but splashed mud or drying marks from puddles can remain.

Checking solar irradiance and weather conditions is the first step in isolating the cause of reduced power generation. By determining here whether the decrease can be explained by weather factors or is difficult to explain by weather alone, the next targets to inspect become clear. In practice, keeping historical generation curves for sunny, cloudy, and rainy conditions makes it easier to assess anomalies.

Point 2: Observe shadow occurrence and time-of-day bias

One cause of low power output to check on-site is the impact of shading. In a solar power plant, even if only part of a panel is shaded, the extent of the shaded area and the circuit configuration can affect power output. In particular, even when it appears that power generation has suddenly dropped, seasonal changes can alter how shadows fall, causing shading to become noticeable from a certain time of year.

When checking for shadows, it is important to see at what times the power output drops. If it is low only in the morning, shadows from trees, buildings, slopes, fences, utility poles, etc. on the east side may be involved. If it is low only in the evening, check for obstacles on the west side. If it drops around midday, check structures around the racking, shadows from adjacent rows, shadows from equipment, overhead lines and pole shadows, etc. If the generation curve shows the same dip every day, suspect shadows from fixed objects rather than clouds.

Seasonal changes in shadows are also important. When the sun’s elevation is low, the same obstacle casts a longer shadow. Trees and buildings that were not a problem in summer can reduce power generation in the morning and evening in winter. The growth of weeds that were not anticipated at the design stage, structures on neighboring land, or equipment installed later can also cause shading. If you notice a sudden drop in power generation, check whether the surrounding environment has changed compared with the past.

During on-site checks, it is effective to actually visit the site during times when power generation is low. Even if you inspect during the daytime, you may miss issues whose shadows only appear in the morning or evening. Check the monitoring data to identify the times when output declines, and observe the panel surfaces during those periods to more easily find the cause. In particular, if a specific section consistently shows low output, focus your inspection on the area around that section.

The impact of shadows can be difficult to assess from their visible area alone. Even small shadows can have different effects depending on where they fall within a string and whether they span multiple panels. Also, when a band of shadow covers only part of a panel, the drop in output can appear large. Leaves, bird droppings, sagging cables, the tips of grass blades — factors that may seem minor can act as localized shading and have an impact.

Shading from weeds is also a factor that commonly occurs on-site. Even if there are no problems immediately after mowing, after a certain period vegetation can cast shadows on the lower edges of panels or on the front rows. This is especially likely to affect power output on low mounting structures or sloped sites, depending on how the grass grows. Weed shading is seasonal and can become suddenly prominent during periods of heavy rain or rising temperatures. When investigating causes of low power output, check not only the electrical equipment but also the condition of site management.

A crucial point when checking shadows is to record the cause together with photographs and the time. Because shadows move over time, they can be difficult to reproduce later when trying to explain them. Recording what time, which section, which panel, and from which direction the shadow was falling makes corrective actions and reporting to stakeholders easier. If you can determine that a shadow is the cause, the direction for countermeasures becomes clear, such as weeding, pruning, relocating obstacles, or operational precautions.

Point 3 Check for dirt and deposits on the panel surface

When power output is low, also check for dirt and deposits on the panel surface. Because solar panels are installed outdoors, they are affected by sand and dust, pollen, yellow sand, bird droppings, fallen leaves, mud splashes, salt, volcanic ash, snow, frost, and similar factors. If the surface becomes dirty, light may have difficulty reaching the cells and power generation can decrease. Especially when output suddenly drops, check for dirt that accumulated in a short period or for any localized obstructions.

The effects of soiling appear differently depending on whether the contamination is thinly spread over the entire surface or concentrated in specific areas. When dust or pollen is deposited thinly across the entire array, the plant’s overall power output may be slightly reduced. In contrast, localized soiling—such as bird droppings or fallen leaves covering part of a panel—can cause a local drop in output similar to shading. If only a particular string shows lower output, prioritize inspecting the panel surfaces within that string.

People tend to assume that dirt will be washed away naturally when it rains, but that is not always the case. In light rain, dirt may not be completely washed off and can instead leave drying marks. On panels with a gentle slope, dirt tends to accumulate at the lower edge. At sites with unpaved surroundings, dust can be stirred up by vehicle traffic and wind, causing surfaces to become dirty in a short period. On development sites, farmland, coastal areas, around factories, and along roads with heavy traffic, the type of dirt and the rate at which it adheres vary from site to site.

Reductions in power generation caused by snow and frost are also important. Even on sunny days, if frost remains during the morning hours, the start of generation can be delayed. If snow remains on the panels, power output falls significantly even under sunlight. Also, when snow remains only partially, the generation curve may differ from when the entire array is completely covered. Since snow and frost melt over time, output may be low only in the morning and recover from before noon.

When inspecting for soiling, you should determine not simply whether something is dirty but whether the soiling is related to a reduction in power generation. A small amount of dirt does not necessarily cause a significant drop. Conversely, a deposit that looks minor can still have an electrical impact. It's important to check whether the low-output sections in the generation data correspond to the areas where soiling is noticeable on site.

When cleaning, prioritize safety and protection of equipment. Work at heights, on slopes, around wet panels, and near electrical equipment involves hazards. Also, using hard tools or improper cleaning methods can damage the panel surface. Follow site-specific management standards and consult with specialist contractors or facility managers as necessary.

Dirt on panel surfaces is not only a cause of reduced power output but also a clue to site conditions. Recording where dirt tends to accumulate, which seasons it is most likely to occur, whether it improves after rain, and whether power generation recovers after cleaning will help with future maintenance planning.

Point 4 Confirm that the power conditioner and junction box are stopped

When power generation suddenly falls, equipment-side causes to check include stoppages of power conditioners and junction boxes. If the total output of the power plant has dropped significantly, one or more power conditioners may have stopped. If specific equipment has stopped, that area will not produce power even when the weather is good. Therefore, it is important to check not only the monitoring screen but also on-site displays and the alarm status.

Causes for a power conditioner stopping include abnormalities on the grid side, overvoltage, undervoltage, frequency abnormalities, temperature rise, insulation abnormalities, internal protection operation, manual shutdown, breaker trip, and so on. Just because it is stopped does not necessarily mean the equipment has failed. A protective function may operate and cause a temporary stop, and the unit may automatically recover when conditions return. On the other hand, if the stopped condition continues or the same alarm is repeatedly issued, it is necessary to identify the cause and take appropriate action.

On site, first check the operating status of each power conditioner. Look at displays such as operating, standby, stopped, and fault stopped to confirm whether they match the areas of low power generation. If there are multiple units, comparing equipment that is operating normally with equipment that is stopped makes it easier to narrow down the issue. If only the stopped equipment has power generation near zero, check that unit’s input side, output side, and protection status in that order.

The condition of junction boxes and combiner boxes is also important. If breakers or switches have tripped, fuses have blown, there are abnormalities at the terminals, or indicator lights differ from normal, power generation will decrease at the string or section level. A fault in a junction box may appear not as a complete shutdown of the power conditioner but as a reduction in some inputs. Therefore, even if the plant as a whole appears only slightly low, a closer look may reveal that only some inputs are at zero.

Also check for output reduction or shutdown caused by temperature increases. Equipment may enter a protective mode due to clogged ventilation openings, dirty filters, insufficient surrounding airflow, direct sunlight, or rising temperatures inside the panel. In particular, during summer the output may drop during periods of strong sunlight and recover in the evening. If only the daytime portion of the generation curve is unnaturally suppressed, consider temperature-related or output-limiting factors.

When checking equipment, the key point is not to touch electrical installations carelessly. Power conditioners, junction boxes, inside panels, and DC-side wiring carry risks such as electric shock and arcing. There are tasks on-site personnel can perform, such as verifying displays and inspecting external appearance, but internal inspections, measurements, and recovery operations must be carried out by qualified personnel or in accordance with procedures set by the person responsible for management. If you confirm an abnormal indication, record the time, equipment number, displayed content, and recovery status, and hand them over to the appropriate personnel.

If the cause of low power generation is equipment being offline, the earlier it is detected the easier it is to limit losses. In particular, when only one unit among multiple units is offline, it can be difficult to notice from the overall power plant figures. It is important as an operational practice to routinely monitor the power output of each piece of equipment and check for any units producing less than usual.

Point 5: Check string-level variations in voltage and current

To pinpoint the causes of low power generation, it is effective to examine variations in voltage and current at the string level. In solar power plants, strings made up of multiple panels connected in series feed into combiner boxes and power conditioners. Even when the plant’s overall output is low, in reality only some strings may be underperforming. In such cases, looking only at aggregate values makes it difficult to identify the cause.

When checking strings, compare strings under the same conditions. If they have the same orientation, the same tilt, the same number of modules, and the same irradiance conditions, the currents and power-generation trends are expected to be roughly similar. If only one string has a lower current, possible causes include shading, soiling, a broken conductor/open circuit, poor contact, a blown fuse, or a panel defect. If voltages differ significantly, check for differences in the number of connected modules, open circuits, poor connections, or measurement anomalies.

A decline in current is a metric that is highly sensitive to solar irradiance and shading. When clouds pass, the overall current falls, but if only a specific string is low, there may be shading or soiling in that area. In particular, if only some inputs on the power generation curve are low while other inputs are close to normal, suspect a localized cause. When customers report low power output, it is often actually the result of multiple such individual string issues accumulating.

When checking voltages, look for conditions such as extremely low values, values close to zero, or values that are abnormally high or low compared with others. However, because voltage and current vary with operating conditions, solar irradiance, temperature, and equipment control, it is important not to judge based on a single value alone. Record the measurement timing, weather, load condition, and equipment operating state together, and compare with other circuits under the same conditions.

Also, string-level anomalies can lead to safety issues. If there is poor contact, loose terminals, wiring damage, or insulation faults, not only can power output decrease, but there is also a risk of overheating and equipment failure. Even if no problem is visible externally, when there is large variability in the data, on-site verification and electrical inspection may be necessary. Inspections must always be carried out in accordance with safety procedures and under the necessary qualifications and management framework.

One thing that is easy to overlook on site is that the string that is underperforming is not always the same. If the cause is shading, the lowest-performing string can change with the time of day. If the cause is dirt or a fault, the same string tends to remain consistently low. Therefore, it is important to observe trends not only from a single measurement but also by time of day, by day, and by weather.

String-level data helps narrow down the cause of a power generation decline from a "plant-wide issue" to an "issue in a specific area." If you feel the power generation of the entire plant is low, checking with finer granularity—by equipment, by input, and by string—can reduce the list of possible causes.

Point 6 Check for discrepancies between communication data and on-site display

When determining that power generation is low, check whether there is a discrepancy between the communication data on the monitoring system and the on-site display. Even if the monitoring screen appears to show a low output, the actual on-site equipment may be generating normally. In such cases, the cause may not be the generation equipment itself but communications, measurement, data aggregation, or display settings.

In cases of communication data faults, phenomena such as the power generation appearing as zero, updates stopping midway, only certain devices missing data, or the figures in daily and monthly reports not matching actual conditions can occur. If the power conditioner display on site shows that generation is occurring but remote monitoring appears to show no generation, check the communication line, data logger, measuring instruments, aggregation settings, and so on.

The first thing to check is the data's update timestamp. Even if the monitoring screen shows a low power output, if the timestamp has stopped, it may not reflect the current condition. After communication is restored, data may be backfilled, or it may remain missing. Before judging that power output has suddenly dropped, confirm whether the displayed data is up to date.

Next, compare the on-site displays with the monitored values. Check whether the on-site power conditioner display, the energy meter, and the monitoring system readings are close to each other. If generation is occurring on site but the monitoring system shows lower values, communication or aggregation issues are suspected. If the on-site displays are also low, check for equipment faults or solar irradiance conditions. Performing this comparison can reduce unnecessary equipment inspections.

Be careful about differences in measurement points. The output of the power conditioner, the energy at the point of supply, and the aggregated values from monitoring equipment have different meanings even for the same power plant. Due to differences in auxiliary power, losses, measurement intervals, and aggregation timing, they may not match exactly. Therefore, clarify which value you are using to judge that "generation is low." The method of verification varies depending on whether it is the daily report value, instantaneous output, or cumulative energy.

Errors or changes in settings can also be a cause. If the registered values for equipment capacity, the number of devices, measurement multipliers, date delimiters, communication destinations, aggregation units, etc., are misaligned, readings may be shown lower than the actual values. In particular, configuration inconsistencies are likely to occur after device replacements, updates to communication equipment, changes to monitoring settings, or expansion work. If power generation declines after work, always check the history of communications and setting changes.

Communication data problems may not directly cause generation losses, but they are a major management issue. If the correct generation output cannot be determined, it affects early detection and reporting of anomalies, financial management, and maintenance decisions. Verifying whether the monitoring data are reliable is fundamental to power plant management.

Point 7 Review Recent Work History and Configuration Changes

When power generation suddenly drops, it is important to review the recent work history and any configuration changes. The causes of reduced power generation are not limited to spontaneously occurring faults. They can occur after human-related activities such as inspections, cleaning, mowing, construction, equipment replacement, configuration changes, outage work, or updates to communication equipment. When investigating the cause on site, compare "when did the generation start to drop?" with "what was done immediately before that?"

What we want to check are cases where breakers or switchgear have not been returned to their original state after work. If circuits that were temporarily shut down for inspection or construction remain unrecovered, the power generation in that area will decrease. Also, after configuration changes, some equipment may be left in a standby state, or communication settings may have changed and not been reflected in monitoring. If generation is low immediately after work, confirm the recovery status before suspecting a fault.

Care should also be taken after maintenance work such as cleaning or mowing. During the work, cables may have been stressed, abnormalities may have appeared around connectors, cut grass or debris may have been left near equipment, or communication lines may have become disconnected. Of course, routine work does not always cause abnormalities, but if the timing of a drop in power generation is close to the time of maintenance, check for a possible connection.

After equipment upgrades or part replacements, checking settings and connection status is essential. When devices are replaced, meters are updated, or communication equipment is swapped, even if the devices themselves are operational, measurement multipliers, connection destinations, input assignments, or naming settings may be misaligned. As a result, reported power generation may appear low or some data may be missing. Including a check that the local display matches the monitoring screen in the post-work checklist makes it easier to detect such problems early.

Operations by the utility or grid, output control, or operations on incoming power equipment can also have an impact. Even if there are no abnormalities in the power plant's equipment, output may be curtailed due to grid conditions. If overall generation is low and output appears to be restricted only during specific time periods, check not only the on-site conditions but also the status at the interconnection point and upstream.

When reviewing work history, it's important to keep written records rather than rely on verbal memory. Recording the work date, work performed, equipment involved, scope of shutdown, confirmation of restoration, whether any abnormal indications were present, and the details of any setting changes makes it easier to trace the cause if power output drops. Conversely, if work records are ambiguous, checking with relevant personnel can take time and delay recovery.

To find the causes of low power generation on site, it is important not only to look at the data but also to view the workflow in chronological order. By lining up the date and time when output began to drop, the weather, work history, alarm history, and communication history, it becomes easier to determine whether the decline was coincidental or related to work.

Approach to Isolating Causes of Low Power Output in the Field

When isolating the cause of low power generation, it's important not to jump straight into the details but to check in order from larger areas to smaller ones. First, determine whether the decline is affecting the entire power plant, some pieces of equipment, or one or more strings. The causes you should suspect differ depending on whether the whole plant is underperforming or only a part of it.

If the entire plant's output is low, check solar irradiance, weather, output control, grid-side conditions, a complete shutdown, and anomalies in aggregated monitoring data. If only a specific power conditioner is low, check that unit's operating status, alarms, input, output, breaker, and ambient temperature. If only a specific string is low, check shading, soiling, wiring, connections, fuses, and the condition of the panels. By separating the scope in this way, you can narrow down the potential causes.

It's also important to look at the time of day. Low only in the morning, low only at midday, low only in the afternoon, low all day, or suddenly dropping to zero at a certain time — the shape of the power generation curve provides clues to the cause. Morning and evening declines may be caused by shading or frost. Midday declines can be related to temperature, output control, clouds, or equipment protection actions. If output is low all day, broadly check for dirt, shutdowns, settings, communications, or insufficient solar irradiance. If it suddenly approaches zero, suspect a shutdown, tripping/disconnection, or communication loss.

We also monitor the rate of decline in power generation. The urgency varies depending on whether it’s a drop of a few percent, a drop to about half, or almost zero. If the decline is large, the likelihood of equipment shutdown or circuit interruption increases. If a minor decline persists, possible causes include dirt, grass, seasonal factors, temperature, and aging. However, even a small decline sustained over a long period can result in significant losses, so do not leave it unaddressed and monitor the trend.

At the site, it is necessary to avoid assuming a single cause. A decrease in power generation can result from multiple factors overlapping. For example, on a lightly cloudy day, overlapping grass shadows combined with a single piece of equipment reducing its output due to a rise in temperature can make the generation appear significantly lower. In such cases, looking only at the weather, only at shading, or only at the equipment will not reveal the whole picture. Decisions should be made by combining data with on-site conditions.

When reporting, it is important not only to state the result "power generation is low" but also to organize and convey the facts you confirmed. Summarize when it started being low, what range is affected, what the weather was like, what the solar irradiance was, whether there were any alarms on the equipment, whether the on-site display and monitoring data match, and whether any recent work was carried out. Having this information makes it easier for the next person in charge to make a judgment.

Preventing recurrence of anomalies requires a system of routine management. Not only checking daily power generation, but also being able to view changes by device, by circuit, and by time of day will allow you to detect anomalies early. Short-term stoppages and shadows that occur only at specific times, which monthly inspections may not catch, become easier to identify by looking at the generation curves. To detect drops in power generation quickly, it is important to know the normal baseline values.

Summary: It is important to eliminate the causes of reduced power output one by one

When power output suddenly falls, instead of hastily jumping to the conclusion of a fault, it's important to align the comparison conditions and check the causes in order. By examining solar irradiance and weather changes, the occurrence of shading, soiling on the panel surface, stoppages of power conditioners or junction boxes, string-level variations, discrepancies between communication data and on-site displays, and recent work history one by one, you can efficiently narrow down the cause.

In practice, it is important not to look only at the total generation, but to check the generation curve by time of day, generation by equipment, and status by input. Causes of low generation can be divided into those that affect the entire system and those that affect only parts of it. If the entire output is low, check the weather, grid conditions, and monitoring settings; if only part is low, focus on shading, soiling, shutdowns, wiring, and connections.

Also, always record the information you observe on site. By keeping records of the date and time when power generation was low, the weather, the scope of the decline, on-site displays, alarms, photographs, and work history, you not only aid in root-cause investigation but also contribute to preventing recurrence and preparing reports. In power plant management, not only is the ability to detect anomalies important, but so is the ability to maintain records that can explain them.

When power generation is low, noticing it early, correctly isolating the cause, and taking the necessary measures makes it easier to limit losses. Combining daily monitoring with on-site checks and establishing operations that do not miss signs of declining power generation leads to stable power plant management.