India’s solar energy capacity has grown at a pace that would have seemed unlikely ten years ago. The project development, financing, and construction sides of the industry have matured considerably. Where the industry still struggles is operations and maintenance, and the costs associated with it.
For solar EPC companies and independent power producers managing large utility-scale portfolios, O&M costs that were underestimated at the project bid stage are now eating into returns that were already thin. The combination of rising module replacement costs, inverter reliability issues, grid compliance requirements, and the sheer geographic spread of India’s solar installations has made O&M more expensive and more complex than most project financial models assumed.
Digitalization is beginning to change this picture. But understanding where it helps and where it does not requires being specific about what the actual problems are.
The largest component of avoidable O&M cost in Indian solar installations is reactive maintenance. A string or combiner box underperforms, the anomaly is missed in manual monitoring, generation loss accumulates over weeks, and by the time a technician is dispatched the revenue impact is significant. Inverter faults that could have been caught through thermal anomaly detection in the early stages become full inverter replacements because they were caught late.
The second major cost driver is the inefficiency of technician dispatching. When you have sites spread across Rajasthan, Gujarat, or Andhra Pradesh and a team of field technicians who are assigned reactively based on incoming fault alerts, a meaningful percentage of their time is spent traveling to investigate issues that could have been diagnosed remotely and either resolved through remote reset or pre-diagnosed so the technician arrives with the right spare part.
The third driver is soiling. India’s combination of dust, agricultural aerosols in certain regions, and variable rainfall makes soiling loss management genuinely complicated. Without site-specific soiling data, cleaning schedules are often either too frequent, which has a cost, or not frequent enough, which has a generation loss cost. Most Indian solar operators are running a cleaning schedule based on historical averages rather than real-time soiling rate measurement.
A properly implemented digital monitoring and analytics layer changes all three of these problems.
On the reactive maintenance problem, string-level monitoring combined with inverter performance analytics can identify underperformance anomalies within hours rather than days. Paired with thermal imaging from drone surveys on a regular cycle, the combination catches issues early enough to intervene before they become major failures. This shifts the maintenance posture from reactive to condition-based, which is where the cost reduction comes from.
On the dispatching inefficiency problem, remote diagnostic capability means a monitoring centre team can assess whether a fault is a genuine site visit requirement or a remote-resolvable issue. For a portfolio of 20 utility-scale sites, cutting unnecessary truck rolls by 25% has a meaningful impact on the field operations budget.
On soiling, site-specific soiling sensors combined with weather data and performance ratio tracking can tell you when the soiling-related generation loss at a specific site has crossed the threshold where cleaning is economically justified versus the cleaning cost itself. This is optimization that manual scheduling simply cannot achieve at portfolio scale.
The entry point into solar digitalization does not have to be a full digital twin with every inverter and string modeled. A practical starting point is a centralized SCADA and analytics platform with string-level monitoring, performance ratio tracking by site, and basic anomaly detection for inverters.
For a portfolio of 100 MW and above, the economics of this investment are clear. For smaller portfolios the cost-benefit calculation depends on the current O&M cost baseline and how much generation loss is currently going undetected.
If your portfolio is growing and you want to understand what a digitalization roadmap would look like for your specific asset mix and geographic spread, that conversation is worth having before your next O&M contract renewal cycle.
