Global renewable power capacity is expected to double by 2030, adding about 4,600 GW of new generation according to the International Energy Agency’s (IEA) 2025 renewables report. That’s roughly equivalent to the combined power capacity of China, the European Union, and Japan.
In many countries, growth between 2025 and 2030 is expected to outpace the previous five-year period, although this rapid expansion is also intensifying challenges around grid integration, supply chains, and project financing.
Supporting integration isn’t just about balancing supply and demand across the grid. It’s also about making sure thousands of individual systems keep running as intended, often in tough conditions like strong winds. Every installation — whether it’s a solar array, wind turbine, or supporting system — depends on mechanical components that need to perform reliably for long periods with very little intervention.
When that reliability fails, it shows. In November 2025, a blade detached from a 300-foot-tall wind turbine in Plymouth. While the exact cause hasn’t been confirmed, incidents like this are often linked to a combination of extreme weather and mechanical stress.
These incidents highlight a wider reality. Renewable systems are under constant pressure from their environment and day-to-day operation, and even small mechanical issues can grow into bigger problems over time.
Compact assemblies matter more than ever
This is where compact, precision assemblies become critical. Renewable technologies increasingly depend on smaller subsystems responsible for positioning, control, and monitoring. These include drive units, actuator linkages, and sensor mechanisms, many of which operate within confined housings where space is limited and tolerances are tight.
Solar tracking systems provide a clear example. They may look like large mechanical structures, but their performance depends on precise, repeatable movement from compact internal assemblies. Motors, gears, and control systems all need to work together to keep panels tracking the sun throughout the day, directly affecting how much energy they capture.
According to Earth.org, the amount of solar energy reaching the Earth’s surface in just 90 minutes would have enough power to meet global annual energy consumption. This means that even small improvements in capture efficiency can quickly add up when applied across large installations.
Bearings are a big part of what keeps these assemblies working. They support rotating components in motors, gears and sensors, allowing for smooth, controlled movement in tight conditions. It’s a small role on the surface, but it affects the whole system.
In confined spaces, small variations in bearing performance can have a big impact. A slight increase in friction can put more strain on the motor, increasing energy consumption and accelerating wear. Small misalignments can affect positioning, making solar tracking less effective. Over time, these issues can build up across a system, reducing efficiency and increasing maintenance.
Choosing the right materials
Selecting the right miniature bearing for these assemblies depends on balancing environmental resistance with consistent mechanical performance. Stainless steel bearings, particularly in grades such as 440C or 316, are often well suited to outdoor solar applications due to their corrosion resistance in exposed conditions. Where lower friction and longer service intervals are required, hybrid or full ceramic bearings can offer advantages, reducing wear and maintaining smooth operation under variable temperatures.
In compact motor and sensor assemblies, low-noise deep groove ball bearings are commonly used for their ability to deliver precise, reliable rotation within limited space. Careful consideration of sealing and lubrication is equally important, ensuring contaminants are kept out while maintaining stable performance over extended operating cycles.
Contaminated lubricants can cause premature wear and tear on bearings as the lubrication becomes less effective over time and leads to more downtime due to maintenance and replacement.
If businesses don’t proactively manage lubricants by making machine adjustments, monitoring parts and cleaning them, they will not be able to assess when re-lubrication, and therefore planned downtime, is needed.
The time taken to carry out regular assessments of lubrication quality also adds to overall costs of lubricant expenditure. Labor costs associated with checking systems can be overlooked by manufacturers and can escalate further if systems are not running efficiently or if problems remain unchecked and escalate.
Training employees on how to avoid lubricant contamination allows businesses to maintain lubricant efficiency for longer and reduce the wear on parts. Employees need to know which signs to look out for to proactively re-lubricate bearings, forward plan maintenance, and reduce unplanned downtime.
Expert support
If businesses don’t have the expertise in-house, they can invest in support with removing and integrating lubricants. Contacting an external provider gives businesses the peace of mind that the work is being carried out to the highest standards and will last the longest amount of time.
External specialists can also spot any issues that may be costly in the future, such as damaged bearings from inadequate lubrication. They can work with the business to reduce damage in the short-term and create a longer-term maintenance plan to solve the issue. This process allows them to prepare for future costs, and proactively reduce any damage that may already be occurring.
The lubrication must suit the application whether it be high speeds, temperature extremes, chemical exposure, or contact with other liquids. Failure to ensure that the lubrication fits the application can lead to increased operating and maintenance costs for businesses.
That’s why being aware of hidden costs throughout the system’s lifespan, and proactively solving these issues, is key to a company’s bottom line.
Other technologies to keep in mind
The same principle applies across other renewable technologies. In wind turbines, compact control systems adjust blade pitch and orientation in response to changing conditions. These systems rely on rotating components operating under continuous load.
In energy storage, cooling and circulation systems depend on compact assemblies that must function reliably within tight spaces. Hydrogen and grid-support technologies similarly incorporate pumps and compressors where precision components are essential to stable operation.
As systems get smaller, there’s less room for things to go wrong. When everything is tightly packed, even small changes in friction, alignment, or how loads are distributed can start to affect performance. What wouldn’t matter much in a larger setup can quickly become a real issue in a compact, high-precision system.
Material choice becomes especially important here. Renewable installations are out in the elements, exposed to moisture, dust, and constant temperature changes, so components need to hold up over time.
Temperature changes add another layer to think about. Components are constantly heating up and cooling down, causing expansion and contraction. In a compact system, even tiny shifts like this can affect alignment and how loads are shared across a bearing, which in turn affects reliability over time.
In many renewable systems, especially distributed ones, access for regular maintenance isn’t easy. In miniature bearings, lubrication is more sensitive, particularly when temperatures fluctuate, so choosing the right approach is key to keeping things running smoothly over longer periods.
As renewable capacity grows, all of this scales up. A single solar farm might have hundreds of tracking units, each with multiple compact assemblies. Across a wider network, that quickly becomes thousands of bearings all operating at once. Keeping performance consistent at that level comes down to careful design and smart component choices.
As the energy transition moves forward, most of the attention stays on big-picture topics such as capacity, storage, and grid flexibility. But there’s another side to it. These systems need to work reliably, day-in and day-out, in real-world conditions.
That ultimately comes down to the smallest parts, because when it comes to building a resilient and efficient energy future, those details matter.
