State Underground Power Program Round 6 The State Underground Power Program (SUPP) is a State Government initiative to convert areas of overhead wires and poles to underground. Find out more about SUPP and our successful proposal for Round 6 of the program. Announcement : Council has finalised the budget to provide underground power in the Wembley/West Leederville area, with the project to cost $10.9m of which the Town will fund 50% from its reserves and property owners in the project area the remaining 50%. Surveys are now underway for property owners in the Wembley/West Leederville area. See January update for more details.