To comply with power development program and regional load growth, Taipower formulated the Sixth Power Transmission and Substation Project. The project started in July 2001, was revised in 2004 and 2008, and was completed in December 2009.

The project completed 188 new substations, a total capacity of 63,536 MVA of new and expanded substations and a total length of 4,206 ckt-km transmission lines. The expenditure was about NT$320.1 billion.

In 2009, Taipower completed a total capacity of 4,691 MVA of substations and a total length of 357 ckt-km of transmission lines, of which 128 ckt-km are overhead lines and 229 ckt-km underground cables.

The major accomplishments were:

 ◆ 6 EHV substations.

 ◆ 2 primary substations.

◆12 primary distribution substations.

◆ 3 secondary substations.

◆ 54 ckt-km of 345KV transmission lines.

◆ 228 ckt-km of 161KV transmission lines.

◆ 75 ckt-km of 69KV transmission lines.

When the completion of a new substation is delayed or the power consumption in a region exceeds estimates, measures of extension will be undertaken to fulfill the urgent demand. In 2009, the total expansion capacity was 836 MVA, accounting for 17.8% of the newly added capacity. This accomplishment was a great help to stabilize power supply and ensure power supply quality.

In order to increase power distribution reliability and power supply quality, Taipower launched various distribution projects to strengthen its distribution system. The Sixth Distribution Project started in 2008 and is scheduled for completion in 2011. The total budget for this project is NT$56.8 billion.

Up to the end of 2009, the implementation of the budget reached 29.74 billion. The project was 54.3% completed. In the year 2009, new, expanded and improved distribution lines reached 2,973 ckt-km. The replaced and added transformers reached 3,004 MVA, electricity meters reached 291,976 units, and 1,159 feeders were automated.