Why Some Solar Developers Still Choose Water Over Automation, Even Where Water Is Scarce
Solar power is meant to be a clean energy solution. Yet the way many plants are maintained tells a different story. Manual cleaning crews still walk rows of panels with hoses and water tanks, even in states where water is genuinely scarce and even in regions where it is not. The pattern is less about necessity and more about habit.
This matters because water used for solar panel cleaning is rarely small. A single large plant can consume lakhs of litres across a year, drawn from sources that local communities and agriculture also depend on. Waterless alternatives like the Premium Bot exist and work well, yet adoption still lags behind what the technology allows.
The Pattern Developers Keep Repeating
Across solar sites in Rajasthan, Gujarat, Maharashtra, and Karnataka, a similar pattern shows up. Even when water access is not the limiting factor, many developers default to manual cleaning because it is the method their O&M teams already know. Switching to automation requires a procurement decision, a new vendor relationship, and a change in routine. Continuing with what already works on paper feels easier, even when it is not the better choice.
This is a planning gap rather than a lack of awareness. Most developers understand that water use carries cost and risk. Few have built water conservation into their cleaning strategy as a standing requirement, the way they would for emissions reporting or land use compliance.
Why This Is a Conservation Issue Even Where Water Is Available
Water availability changes by season and by year. A region with adequate groundwater today may face restrictions in three years, especially as agricultural and industrial demand grows alongside solar capacity in the same belt. Building a cleaning program around manual water use assumes the current supply will hold. That assumption does not always survive contact with a dry monsoon.
There is also a broader case for restraint. Treating water as freely available because a region currently has enough sends the wrong signal in a sector that is supposed to model responsible resource use. A solar plant that draws heavily on local water for routine panel cleaning is working against the same sustainability goals the plant was built to serve.
What Manual Cleaning Actually Costs in Water
Estimates from O&M teams suggest a 100 MW plant can use anywhere from a few lakh to over ten lakh litres of water annually for cleaning, depending on panel count, soiling rate, and crew technique. Sourcing this water, especially at remote sites, means tankers, storage infrastructure, and in some cases competing with nearby villages and farms for the same groundwater.
None of this shows up directly on a generation report. It shows up in water bills, in community relations, and occasionally in environmental clearance reviews when water drawdown becomes a documented concern.
Waterless Cleaning Removes the Question Entirely
The Premium Bot cleans solar panels without using water. It runs on a programmable schedule, works across fixed-tilt and single-axis tracker installations, and removes dust effectively without the runoff, sourcing, or storage challenges that come with manual washing.
For a developer, this is not just an environmental upgrade. It is also an operational simplification. There is no water tanker schedule to coordinate, no dependency on local supply, and no exposure if water restrictions tighten in the project area later. You can read more about the broader solar panel cleaning robot range for different plant configurations.
Making Water Conservation Part of the Procurement Decision
Developers evaluating cleaning solutions for a new or existing plant can build water conservation into the decision criteria directly, rather than treating it as a side benefit. Questions worth asking during vendor evaluation include:
- How much water does this cleaning method use per cleaning cycle, and how does that scale with plant size?
- What happens to the cleaning program if local water access tightens during peak dry season?
- Does the cleaning method require water sourcing, transport, or storage infrastructure on site?
- Is the cleaning approach consistent with the plant’s environmental clearance and sustainability reporting commitments?
- What is the total cost difference between manual water based cleaning and automated waterless cleaning over a five year period?
Asking these questions upfront moves water conservation from an afterthought to a standard part of how a plant is specified and operated.
A Habit Worth Changing
Manual water based cleaning is not failing because it is technically incapable. It persists because it is familiar. As Indian solar capacity continues to grow, the cumulative water demand from cleaning alone is large enough to warrant a second look, regardless of whether a particular plant sits in a water stressed state today.
Premium Motion supplies the Premium Bot along with motion components including slew drives, linear actuators, and dampers for solar tracker systems. If your plant’s cleaning strategy still depends on water you would rather conserve, contact our team or write to surya.urja@premiummotion.com.
Frequently Asked Questions
Why do some solar developers still use water for cleaning when waterless options exist?
Mostly habit and familiarity. Manual cleaning crews and water based methods have been the default for years, and switching to automation requires a new vendor relationship and a change in routine, even when the waterless option is technically and financially sound.
Is water conservation in solar cleaning only relevant in drought prone states?
No. Water availability changes with season and year, and a region that has enough water today may not in a few years as demand grows. Building a cleaning program around water use assumes a level of supply that is not guaranteed to continue.
How much water does manual solar panel cleaning use?
Estimates vary by plant size and soiling rate, but a 100 MW plant can use several lakh litres of water annually for cleaning, sourced through tankers or on site storage at many locations.
Does waterless cleaning affect cleaning quality compared to manual washing?
No. Automated waterless systems like the Premium Bot are designed to remove dust effectively through mechanical action rather than water, and they can run on a consistent schedule that manual crews often cannot match at scale.
What should developers ask vendors about water use during procurement?
Ask how much water a cleaning method uses per cycle, whether that scales with plant size, what happens if local water access tightens, and whether the method requires on site water sourcing or storage infrastructure.
