Substation maintenance is a process of periodic, planned inspection of and, if necessary, repair, and replacement of all switchgear, buildings, and ancillary equipment in substation installations. In simple terms, substation maintenance is a regimen of regular preventative checks and actions carried out to ensure substations are kept in good working order. This process typically consists of a series of stringent visual and physical inspections and actions carried out according to a set schedule.

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PPEL provides services for substation construction and maintenance. Previous contracts include the construction of high-voltage substation, OHL and installation of 1600A low-voltage switchboard for Shatin Heights Tunnel; and ongoing regular inspection, maintenance, and emergency service of substations for CLP Power Co., Ltd.

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