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Water Storage Tanks for Data Centers in Indonesia: Sizing, Configuration and Local Supply
Indonesia is one of Southeast Asia’s fastest-growing data center markets. Installed capacity was about 456 MW in August 2026, and roughly 2,170 MW of new capacity was announced in just four months. Most of the new large campuses use water-cooled chillers and cooling towers, so every one of them needs reliable on-site water storage.
This article is for MEP consultants, contractors and operators planning data centers in Indonesia.
Where the water goes
- Cooling tower makeup water: the largest use, replacing water lost to evaporation and blowdown.
- Fire water: stored separately for sprinklers and hydrants.
- Rainwater and recycled water: increasingly used to cut potable water demand and improve WUE.
- Domestic water: a small share for offices and amenities.
How much storage a Tier III data center needs
Industry references on the Uptime Institute Tier Standard call for 12 hours of on-site makeup water for facilities that rely on evaporative cooling. At Tier III, that reserve must also be concurrently maintainable, meaning any single tank can be drained for maintenance without dropping below 12 hours.
A simple sizing example for a 10 MW IT load:
| Step | Calculation | Result |
| Heat rejected at the cooling towers | 10 MW IT + about 20% chiller heat | 12,000 kW |
| Evaporation | 12,000 kW x 1.5 L/kWh | 18 m³/h |
| Blowdown (4 cycles of concentration) | 18 ÷ 3 | 6 m³/h |
| Total makeup water | 18 + 6 | 24 m³/h |
| 12-hour reserve | 24 x 12 | 288 m³ |
| Design reserve (+20% for peak days) | 288 x 1.2 | about 350 m³ |
This is a planning estimate only. Final sizing should use the project’s peak load, local wet-bulb conditions and raw water quality.
Tank configuration
- 2 x 100%: two tanks of about 350 m³ each; the simplest way to keep one tank available during maintenance.
- 3 x 50%: three tanks of about 175 m³ each; less total volume and easier to fit on tight sites.
- Tier IV: the same logic plus physical separation of tanks, pumps and pipework so a single event cannot take out the whole reserve.
GFS (glass fused to steel) and bolted steel tanks suit reserves in the hundreds to thousands of cubic meters. FRP panel tanks suit smaller, rooftop or in-building applications.
Where Indonesia’s data centers are being built
Most new capacity is in the Jakarta–Bekasi–Karawang corridor, with major campuses in Kota Deltamas and Cikarang. These include Princeton Digital Group’s JC3 (120 MW) and JC4 (240 MW), Digital Edge’s CGK Campus (up to 500 MW) and BDx’s 640 MW CGK4. Batam is the second major cluster, driven by its proximity to Singapore.
A local tank manufacturer in the Cikarang cluster
PT Tiger Water Solutions manufactures GFS, bolted steel and FRP panel tanks at our factory in Cikarang, a few kilometers from the Deltamas data center campuses. We also design and build water treatment plants for raw, rain and recycled water. For international consultants and contractors working in Indonesia, that means local manufacturing, short delivery times and on-site support from one supplier.