Each machine was 120m long and 3.5m in diameter and comprised four tube sections linked by three, shorter, power conversion modules. Testing of this array proved the speedy installation concepts, developed team experience, maintained safe conditions, and that power generation and behaviour was matched with numerical models.
The devices were located off the northern Portuguese coast in the Atlantic Ocean, near Póvoa do Varzim, in 50 metres of water depth.
The licensing process of the small farm was concluded in 2006 and followed the existing national legislation (DL 254/99) for offshore operation license which had to be undersigned by 5 ministers. The process was relatively fast since the project was considered positively by the government. Although not explicitly demanded at that time, an EIA was done for the small park.
Three machines were installed and operated in July 2008, generating sustained power to the grid with close agreement to the Pelamis simulations. However, the project ended earlier than planned, with the three machines returning to harbour, due the financial collapse of Enersis’s parent company, Babcock & Brown. The machines were operating from July to November 2008.
Key Environmental Issues
An Environmental Impact Assessment has been carried out prior to the project installation. Monitoring activities have been performed during the operation period. Due to the short operation period the monitoring results were inconclusive regarding the devices’ effects on the environment. Nevertheless, two years of environmental baseline studies have been carried out. The Environmental Impact Statement developed before the devices were installed pointed devices’ noise, electromagnetic fields and habitat alteration as the main negative impacts and the “artificial reef” and “sanctuary” effects as positive ones.
Baseline Assessment: Companhia da Energia Oceânica SA (CEO) - Aguçadoura
|Receptor||Study Description||Design and Methods||Results||Status|
|Marine Mammals||Analysis of species composition and distribution.||Visual observations by boat.||Relevant area for marine mammals. Main species: common dolphin (Delphinus delphis) and harbour porpoise (Phocoena phocoena).||Completed|
|Fish||Analysis of populations’ structure and composition.||Samples were collected each two months.||High number of commercial species presenting a moderate level of conservation. High temporal variability.||Completed|
|Invertebrates||Analysis of communities structure and composition.||Samples were collected each three months.||High biodiversity presenting a good level of conservation. High temporal variability.||Completed|
Post-Installation Monitoring: Companhia da Energia Oceânica SA (CEO) - Aguçadoura
|Stressor||Receptor||Study Description||Design and Methods||Results||Status|
|Attraction, Avoidance, Collision||Fish||Pelagic fish aggregation around the devices was analysed.||Samples were collected each two months.||Due to the short operation period the monitoring results were considered inconclusive regarding the devices’ effects on the environment.||Not Completed|
|Habitat Change||Invertebrates||Analysis of invertebrate colonisation on the equipment was analysed.||Samples were collected each three months.||Due to the short operation period the monitoring results were considered inconclusive regarding the devices’ effects on the environment.||Not Completed|
|Attraction, Avoidance, Collision||Marine Mammals||Visual observations by boat to analyse changes on marine mammal behaviour and distribution.||Visual observations by boat.||Due to the short operation period the monitoring results were considered inconclusive regarding the devices’ effects on the environment.||Not Completed|