Viana Mill power station is a 71 MW gas power plant in Viana de Castelo, Portugal. It is operated by Ds Smith Paper Viana [100%]. Based on its capacity (estimated), it can supply roughly 80k homes (estimated). It ranks #34 of 480 Portugal power plants by installed capacity. Commissioned in 2008, it is around 18 years old — relatively modern. Its annual emissions of 98,635 t CO₂/yr (EU ETS verified (EUTL 2023)) are equivalent to about 23k cars driven for a year. In context, gas supplies about 16.4% of Portugal's electricity; the national grid averages 128 gCO₂/kWh (81.0% low-carbon) (2025).
Plant data: WRI Global Power Plant Database (CC BY 4.0), id GOGPT_vianamill_portug.
Data status
Known data
Calculated from dataset
Not available
Known, modelled and calculated values are kept separate. Missing fields are shown as unavailable.
Data provenance
Source of the capacity and fuel values:
capacity: GEM · 2026 · L100000407834; fuel: GEM GOGPT
In context: how this plant compares
At 71 MW, Viana Mill power station is below the median gas plant in Portugal (80 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.
98,635 t CO₂/yr — in everyday terms
This facility's annual emissions are roughly equivalent to:
Equivalencies via US EPA Greenhouse Gas Equivalencies; emissions per EU ETS verified (EUTL 2023) (measured for US EPA/EU ETS, modelled for Climate TRACE).
Key facts
- Share of Portugal gas capacity
- 1.6% of 4,359 MW across 13 plants in this dataset
- Age among peers
- 4 of 12 dated gas plants in Portugal 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 Portugal
Installed capacity (MW), WRI Global Power Plant Database (CC BY 4.0).
Owner
Operated by Ds Smith Paper Viana [100%].
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 warm-summer Mediterranean climate (Köppen Csb) — Northern Hemisphere, latitude 41.7°N — which shapes how much energy it can produce and how its output varies through the year.
Monthly mean temperature
Heating degree-days here run 39% below the median power plant in this dataset — a proxy for how much extra energy heated equipment must replace through its surfaces in winter.
Climate heat-demand index: 34/100 — this site sits in the mid third of the power plants we cover by heating degree-days.
A gas turbine here also runs ~0% 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 marine corrosion 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 #8 largest gas power plant of 13 in Portugal by capacity.
Portugal has 13 gas power plants in this dataset, together about 4,359 MW of capacity.
Nearby power plants
- Cogeração EUROPA&C Energia Viana · Biomass · 38.8 MW · Viana do Castelo
- Viana do Castelo (Aterro Sanitário) · Waste · 2 MW · Viana do Castelo
- Carreço-Outeiro II · Wind · 12 MW · Viana do Castelo
- Carreço-Outeiro · Wind · 20.7 MW · Viana do Castelo
- Praia Norte · Wind · 2 MW · Viana do Castelo
- Arga · Wind · 36 MW · Viana do Castelo
Location
Coordinates 41.6998, -8.715 from WRI Global Power Plant Database (CC BY 4.0). View on OpenStreetMap.
Frequently asked questions
What type of power plant is Viana Mill power station?
Viana Mill power station is a 71 MW gas power plant in Viana de Castelo, Portugal, commissioned in 2008.
Who operates Viana Mill power station?
Viana Mill power station is operated by Ds Smith Paper Viana [100%].
How much CO₂ does Viana Mill power station emit?
Viana Mill power station has measured emissions of about 98,635 tonnes of CO₂ per year (EU ETS verified (EUTL 2023)).