SDDP is a proprietary "hydrothermal dispatch model with [optional] representation of the transmission network used for short, medium and long term operation studies" (PSR Inc.).

The Commission has used SDDP in the past to analyse dry-year security of supply, future generation costs, and predicted patterns of dispatch. We have recently redeveloped our SDDP data files to make them consistent with the generation and demand assumptions in the 2008 Statement of Opportunities (SOO).

For the convenience of participants using SDDP, in-development SDDP input data files zip [1393 KB] are attached. Input files are provided for five scenarios, which correspond to the five generation scenarios described in the SOO.

These in-development SDDP input files are provided because they may be useful for investigative analysis of supply/demand issues in the New Zealand power system. However, they have not been rigorously checked or tested, so any prospective users should exercise caution. Note also that they may not be updated to reflect changes to the Grid Planning Assumptions after the publication of the 2008 SOO.

The input files use a monthly time step and do not include an explicit representation of the AC transmission system. (SDDP does include a limited model of AC losses and constraints, but this feature is not necessary for all applications and does slow the program down at run time.)

The download includes a common set of hydrological flow data, for use in all five scenarios; these flow data were sourced from the 2006 Spectra Update, which has been released in the Commission's Centralised dataset.

The raw outputs from these SDDP runs can be downloaded her for mds1 zip [256874 KB],  mds2 zip [243790 KB]
, mds3 zip [238841 KB], mds4 zip [235997 KB], and mds5 zip [234624 KB].

Update: new hydrological inflow files

• Hydrological flow files is SDDP format from the new Spectra Update 7

Contact Brian Bull for any further information on the Commission's SDDP modelling work.