Bay–Calamba–Biñan Transmission Line

The Bay–Calamba–Biñan Transmission Line (abbreviated as 8LI1BIN-CAA, 8LI2BIN-CAA, 8LI1CAA-BYZ, 8LI2CAA-BYZ, BCBTL), formerly known as Bay–Biñan Transmission Line, is a 230,000 volt, double-circuit, two-part transmission line in Calabarzon, Philippines that connects Bay and Biñan substations of National Grid Corporation of the Philippines (NGCP).

History
The current power line was constructed from December 8, 2002 to March 28, 2009 from December 8, 2002 to March 28, 2009 spanning from the transmission line operators National Power Corporation (NAPOCOR/NPC) from December 8, 2002 to March 1, 2003, National Transmission Corporation (TransCo) from March 1, 2003 to January 15, 2009, and National Grid Corporation of the Philippines (NGCP) from January 15 to March 28, 2009 as part of Batangas Transmission Reinforcement Project (BTRP). Lattice towers used on the Calamba–Biñan segment of the original transmission line, however, are still present despite that it is now abandoned upon the completion of the current line. The current power line was formerly a one-part power line or direct connection from March 28, 2009 to 2021. Due to becoming a two-part transmission line since 2021, NGCP replaced their steel poles and lattice towers' reference tags and renumbering of the steel poles and towers. The transmission line's right-of-way (ROW) or portions that use steel poles and lands where the poles are located were designated and acquired, and the poles themselves were built by TransCo with permission from the then operator of SLEX and another government-owned corporation Philippine National Construction Corporation (PNCC), Carmona, and Biñan local government units (LGUs).

Route description
The Bay–Calamba–Biñan Transmission Line passes through the provinces of Laguna, Batangas, and Cavite. The original transmission line and rights of way (ROWs) or portions of the current line that use lattice towers and steel poles near Bay Substation (1–49), that use steel poles starting pole 50 up until Biñan Substation, and connection to Calamba Substation were acquired, designated, and commissioned by government-owned companies National Power Corporation (NAPOCOR/NPC) and National Transmission Corporation (TransCo), and privately-owned National Grid Corporation of the Philippines (NGCP), respectively. It is located within the service area of NGCP's South Luzon Operations and Maintenance (SLOM) Districts 1 (South Western Tagalog) and 2 (South Eastern Tagalog).

Bay to Calamba
The transmission line starts at Bay substation and enters Batangas after lattice tower 4. It passes through the barangays of Santa Elena, San Pablo, San Pedro, San Vicente, San Miguel, San Bartolome, San Antonio, Santiago, San Rafael, and Santa Anastacia in Santo Tomas. Before re-entering Laguna, it passes through Light Industry and Science Park III. It re-enters Laguna upon crossing Siam-Siam Creek, runs parallel with South Luzon Expressway (SLEX) on Calamba Exit starting with lattice tower 48, and shifts to double bundle conductor from quadruple bundle.and goes right to connect with Calamba Substation.

Calamba to Biñan
From Calamba Substation, the line continues to utilize the eastern side of SLEX from Calamba Exit to Carmona Exit and again uses steel poles after lattice tower 48. It continues straightforward, intersects with Calaca–Laguna Technopark–Biñan transmission line after passing Greenfield City/Unilab (Mamplasan) Exit, enters Cavite upon crossing Carmona River, exits SLEx at Carmona Exit, and run parallel with Governor's Drive and General Malvar Street. The power line again enters Laguna and ends at Biñan substation.

Technical description
The transmission line is a double circuit, double to quadruple bundle power line with its 60.04-60.27 hertz limit on equipments. The transmission line's lattice towers run outside of the SLEX right-of-way or alignment and to the challenging terrain. The poles were 94% design from the USA and 79% from China. During the renaming the transmission line, the pole's reference tags had to be replaced (by ripping and scrapping off the old reference tag), relabel the reference tags from (8LI1BIN-CAA)001, (8LI2BIN-CAA)001 to (8LI1CAA-BYZ)001, and (8LI2CAA-BYZ)001 and renumbering the poles. The reference tags is placed on near pole number tag or over the pole number tag. These techniques make the crews difficult to identify. The electrical current runs south because it is the last of the six power lines that form the transmission network from Bataan Combined Cycle Power Plant (BCCPP) in Limay, Bataan to Mak–Ban Geothermal Power Plant in Santo Tomas also in Batangas and Bay in Laguna. Double circuit steel poles had suspension design (braced line post) and double circuit anchor design (deadend insulators).