BLOG – SELKIE TOOL SERIES: GIS-Technoeconomic tool for wave and tidal energy

BLOG – SELKIE TOOL SERIES: GIS-Technoeconomic tool for wave and tidal energy

Accurate and up-to-date geographic information system (GIS) and techno economic (TE) decision support tools are pertinent to helping to develop the renewable energy sector. The proposed tool aims to incorporate increased resolution and site relevance of resource data, the most up-to-date geospatial data representing all potential opportunities, constraints and, restrictions and will provide device specific techno-economic recommendations for various contemporary wave and tidal energy device designs. The result will be the development of the first true GIS-TE tool in renewable energy. It will be geared specifically to wave and tidal energy applications and bespoke to Irish and UK waters.

The Selkie GIS-TE will be populated with the most up-to-date GIS layers on the appropriate opportunities, constraints and restrictions, thus enabling the user to pinpoint optimum locations for specific types of WEC or TEC devices. The tool will also include accurate and up-to-date bathymetry layers.  In so far as conditions permit, all data and outputs on the Selkie GIS-TE platform will be available for the user to download where possible or will at least have a clear link to the data source. The tool will achieve a high level of clarity in terms of descriptive metadata for each layer, with clear concise descriptions, data sources clearly defined, and links to the associated sources.

The tool, will take power curves/matrices from a number of contemporary WEC and TEC technology types and couple these with the high-resolution resource data from the modelling procedures for the purposes of creating technical resource assessment layers based on the operational parameters of these specific wave and tidal energy design types. These will feed into the MCDA for rank location. Upon identification of highly ranked sites (resource plenty and geospatially appropriate), it is intended that the tool facilitate NPV, LCOE and any other relevant financial performance indicators, such as those which consider environmental cost savings, in order to assess the economic potential on said. This will require the CapEx, OpEx, WACC, discount rate, expected life and decommissioning cost of the tender victors. The result of this location based NPV/LCOE is a quantification of the economically viable renewable generation that is available at those specific sites of interest. Additional functionality may include the ability to view and download graphs of the techno-economic outputs from such simulations, as done for the GWA, PVGIS and Retscreen outputs.

The Selkie GIS-TE is already under development using ESRI’s JavaScript API and 1,000 lines of code have been written so far. Functionality to date includes the ability for the user to scroll through some of the various GIS layers, adjust the transparency of layers (when viewing one more than one layer), measure out theoretical sites off the coast, measure distance from shore, switch between basemaps, access a contact page, access the Selkie twitter page and access more information about the OceanEnergy buoy and the Sabella turbine.

The next stage will involve the GIS MCDA (multi-criteria decision analysis) phase for site selection. Please get in touch if you would like to input in to the development of the GIS-TE tool; a workshop on the tool will take place in early 2021. The following would be ever so helpful from our industry partners at this stage:

In determining suitable sites, based on their device and knowledge, what they perceive to be:

– Maximum wave height (Hmax) that the device can withstand (more for WECs)?

– Minimum tidal current in m/s (for TECs)?

– Desired water depth range for deployment?

– Desired seabed character (morphology and slope)?

– Bedrock sediment depth required?

– Maximum distance to infrastructure (grid and access ports)?

– Height that device protrudes above the sea surface?

– Importance of visual impact?

– Importance of SACs, SPAs, MCZs and MPAs?

– Importance of vessel traffic density?

This stage should be complete in early 2021 and will be followed by the commencement of TE modelling.