Solar monitoring in Saudi Arabia: soiling at half a percent per day (2026)
Measured soiling in central Saudi Arabia is among the highest recorded anywhere. At the giga-project scale the Kingdom builds, cleaning strategy is a data problem before it is a labor problem.
Measured soiling in central Saudi Arabia runs at 0.44 to 0.51 percent of output per day, uncleaned modules lose about a third of their output within months, and a single sandstorm can cut production 20 percent. With 12 GW of new solar PPAs signed in 2025 alone, deciding when and where to clean is worth millions per site per year, and it is decided by data.
The measured numbers, not the folklore
Saudi soiling is one of the best-documented in the world, and the documented numbers are severe. The KAPSARC measurements on Saudi Aramco arrays near Riyadh remain the reference point.
| Study | Location | Finding |
|---|---|---|
| KAPSARC / IEEE | Riyadh (3.5 MW and 1.8 MW arrays) | 0.44 to 0.51 percent output loss per day by module type |
| Energies review, 2022 | Riyadh | 32 percent output loss after 8 months uncleaned |
| Energies review, 2022 | Dhahran | Over 50 percent power loss after 6 months uncleaned |
| Yanbu 2-year study | Yanbu Al Sinaiyah | 24 percent cumulative generation loss from soiling |
| Energies review, 2022 | single event | One sandstorm cut output 20 percent |
Cleaning optimization studies for desert climates put the optimal interval at roughly 8 to 15 days, with annual water needs of 6 to 36.5 litres per square metre of module to hold losses under 3 percent. The spread in those numbers is the point: the right cadence depends on season, dust events, and site, so a fixed calendar is always leaving money on one side or the other.
Giga scale turns cleaning into portfolio optimization
In July 2025, ACWA Power, Badeel, and Aramco’s SAPCO signed PPAs for 15 GW of renewables, 12 GW of it solar, in a single round. Sudair alone is 1.5 GW; the Al Shuaibah complex approaches 2.6 GW. At that scale nobody cleans a whole plant at once: cleaning crews move block by block, and the scheduling question becomes which blocks, in which order, this week. Per-inverter soiling estimation, derived from the electrical data after weather and temperature correction, gives the ranking without deploying a soiling station per block. Where reference stations exist, they become calibration points rather than the only signal.
Grid code, briefly
Transmission-connected plants operate under the Saudi Arabian Grid Code, last updated in May 2024, with WERA as the approving authority, and the Saudi Electricity Company publishes dedicated technical connection standards for large-scale PV. Performance reporting against those obligations comes from the same telemetry the analytics run on.
Grid code and reporting obligations
- Regulator
- WERA (Water and Electricity Regulatory Authority)
- Grid code
- Saudi Arabian Grid Code, updated May 2024; WERA approves amendments
- Large-scale PV
- SEC PV Large Scale Technical Connection Standards apply to utility connections
NuraVolt ships country grid-code packs that map plant telemetry to the local reporting obligations. See the compliance reference for the full pack list.
Inverters and data sources we connect
| Brand | Notes |
|---|---|
| Sungrow | Direct cloud API integration; central and string inverters at utility scale |
| Huawei SUN2000 | Direct cloud API integration |
| SMA | SCADA or logger export |
| Plant SCADA | Utility-scale sites integrate via SCADA export or historian access |
How NuraVolt deploys in Saudi Arabia
NuraVolt is software only. There is no hardware to install, no site visit, and no local office required: plants onboard remotely from the data sources they already have, such as inverter vendor APIs, SCADA exports, or data loggers. A typical onboarding takes days, not months, and starts with a historical backfill so the models see a full seasonal cycle before live monitoring begins.
Per-inverter soiling estimation, fault detection, and BESS health analytics run on that operational data directly. That matters in markets where dedicated soiling stations and extra instrumentation are hard to procure, import, and maintain: the analytics work with the fleet you already operate.
Estimate the value for your fleet
The NuraVolt ROI calculator includes a preset for this market with local solar hours and tariff assumptions. Use it to estimate what recovered soiling and fault losses are worth across your portfolio, then bring the numbers to a call.
Frequently asked questions
See also
See this on your own plants
NuraVolt turns your SCADA and BMS data into early fault detection, degradation-aware BESS analytics, and audit-ready reporting. A fixed-scope audit shows you what we’d find on your portfolio.