Substation and transmission line projects form an important part of power engineering work. Since the 1990’s, HEI has been engaged in working on transformer substation and transmission line projects. Enabled by its large number of experienced technical experts, HEI undertook the construction of 500KV, 220KV and 110KV substation projects, and 500KV and 200KV single/double-circuit transmission lines in the Philippine and other countries.