Macro Demand Spatial Approach (MDSA) is an approach introduced in long time electricity demand forecasting considering location. It will be used at transmission planning and policy decision on electricity infrastructure development in a region. In the model, MDSA combined with qualitative approach and quantitative approach as mixed method. QA used to determine main development area and supporting area in region.This method is used to prove the hypothesis that the observed transmission service area are not homogeneous.

Main development area is an area with industrial domination as a driver of economic growth. Whilst, supporting area is an area with residential domination that supporting economic growth at main development area.Hence, the electricity demand driver variables are different for type of electricity consumer at different spatial characteristics. The variables have no significant effect can be reduced by using PCA. The results of PCA should be validated with the results of QA. Generated models formed from the variables generated by PCA. The generated models tested to assess whether it fit with the actual data. Range of interval confidence level used as fit criteria. At the case study, generated model for main development areas and supporting area in Southern Sumatra Regionas a part of Sumatra System is still in the range of confidence level. Thus, MDSA can be proposed as alternative approach on demand forecastingat transmission planning that considering location. © 2015, School of Electrical Engineering and Informatics. All rights reserved.

Single Line Diagram of SSR. 

shows service area of electricity subsystem, position of power plant, transmission and load in Southern Sumatera Region. Though the administrative area is not always equal to the area of electricity subsystems, but in general the administrative area has similarities with electricity subsystems.Considering the matter, then SSR can divided into 3 spatial units. The unit spatial are South Sumatera, Bengkulu and Lampung.Documents of regional development plan that analyzed is the document of Sumatera development plan as a whole. Selection of development plan documents of Sumatra region is done in order to obtain an integrative assessment of SSR positions on observations of a whole Sumatera. Observation area is basically a subset of the parent region. SSR region which became the area of observation is a subset of Sumatra. MDSA approach in determining the electricity demand in SSR started with qualitative analysis. Documents used as references to conduct qualitative analysis of spatial electricity.

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