PLTG Grati is a 302 MW gas power station in East Java, Indonesia. It is operated by PT. Indonesia Power. Based on its capacity (estimated), it can supply roughly 340k homes (estimated). It ranks #120 of 401 Indonesia power plants by installed capacity. Commissioned in 1997, it is around 29 years old — long-established. In context, gas supplies about 18.5% of Indonesia's electricity; the national grid averages 680 gCO₂/kWh (18.1% low-carbon) (2024).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id WRI1000829.
Data status
Known data
Calculated from dataset
Not available
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
Capacity provenance
The public capacity above is the current source-record value. A 2026 tracker candidate lists 1,356 MW for Grati power station, but it is not used as the public primary value until scope is verified (unit vs operating vs installed/project total).
Data provenance
Source of the capacity and fuel values:
capacity: GEM · 2026 · L100000405270; fuel: WRI GPPD
In context: how this plant compares
At 302 MW, PLTG Grati is well above the median gas plant in Indonesia (150 MW). Technically it is described as CCGT; combined-cycle with a heat-recovery steam generator (HRSG). Gas plants burn natural gas either in open-cycle turbines for fast peaking, or in combined-cycle units that recover exhaust heat in an HRSG to reach roughly 55–62% efficiency — the cleanest-burning fossil option.
Capacity comparison computed from the WRI Global Power Plant Database; fuel-type context is general engineering background.
Key facts
- Share of Indonesia gas capacity
- 0.7% of 44,657 MW across 138 plants in this dataset
- Age among peers
- 6 of 99 dated gas plants in Indonesia are older
Calculated from the capacity and generation records in this dataset (WRI Global Power Plant Database (CC BY 4.0)).
Capacity vs largest gas plants in Indonesia
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by PT. Indonesia Power.
Local climate & thermal context
This gas plant burns natural gas in a turbine — often in a combined-cycle setup — to generate electricity. It sits in a tropical savanna climate (Köppen Aw) — Southern Hemisphere, latitude 7.7°S — which shapes how much energy it can produce and how its output varies through the year.
Monthly mean temperature
This site has effectively no heating season (tropical/equatorial climate), so winter heat loss is not the driver here. The thermal concern shifts to year-round process heat and humidity/heat-driven corrosion of hot equipment.
A gas turbine here also runs ~8% below its ISO (15°C) rating at this annual mean (typical CCGT curve, estimate).
Climate normals: WorldClim 2.1 (1970–2000 monthly normals, 10 arc-min, CC BY 4.0); zone: Köppen-Geiger world climate classification (Kottek et al. 2006, 0.5° grid). Degree-days & heat-demand index computed by PowerAtlas — a modelled heat-demand proxy, not a measured site figure.
Site climate & environmental severity
This site sits in a corrosive environment (estimated ISO 9223 class C4 — High), with humidity / wetness the leading environmental stress.
Indicative estimate via the ISO 9223:2012 informative method (atmospheric corrosivity from temperature, time-of-wetness and airborne salinity), using WorldClim climate normals, the Köppen-Geiger class and coast distance. Indicative, not a measured corrosion rate.
How it compares & nearby plants
The #38 largest gas power plant of 138 in Indonesia by capacity.
Indonesia has 138 gas power plants in this dataset, together about 44,657 MW of capacity.
Nearby power plants
- PLTGU Grati · Gas · 461 MW · East Java
- Jawa-4 power station · Gas · 1,000 MW · East Java
- PLTU Perak · Coal · 100 MW · East Java
- PLTU Paiton I Unit 7 & 8 · Coal · 5,355 MW · East Java
- Tjiwi Kimia Paper Mill power station · Coal · 230 MW · East Java
- PLTG Gresik · Gas · 80 MW · East Java
Location
Coordinates -7.6517, 113.0244 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is PLTG Grati?
PLTG Grati is a 302 MW gas power plant in East Java, Indonesia, commissioned in 1997.
Who operates PLTG Grati?
PLTG Grati is operated by PT. Indonesia Power.