PJM presented a number of baseline project solutions to the Transmission Expansion Advisory Committee Thursday that are expected to be recommended to the PJM Board in February for inclusion in the Regional Transmission Expansion Plan.
Those projects include a PSE&G FERC 715 local planning criteria project related to equipment assessments. A third-party condition assessment concluded that structures on the 230-kV Roseland–Branchburg–Pleasant Valley line have reached their end of lives. Several alternatives were evaluated and considered. Due to cost, feasibility, performance and permitting/siting issues associated with the alternatives, the recommended solution is to replace the existing structures with new structures at a projected cost of $546 million.
PJM concluded the final 2017 RTEP window issue with a recommendation to install a new 230-kV circuit breaker at the Linwood 230 kV station in the PECO transmission zone.
In addition, PJM discussed voltage control issues in PJM real-time operations on the 500-kV system in the Dominion zone. The recommended solution is to install STATCOM reactive control devices at two locations in the Dominion zone. Other alternatives were considered but determined not feasible due to the dynamic nature of the operations in the area and the resulting need for a dynamic device.
Also included in the update was an estimated cost increase for the baseline Chesterfield–Messer Road–Charles City Road 230-kV project in the Dominion zone, to $31.7 million from $22 million. The additional expense is driven by the challenge of working around wetlands, a newly discovered need to relocate communication fiber due to existing constraints and more river structures being identified for replacement because of their condition.
In the AEP transmission zone, a supplemental project calls for upgrades at Twin Branch Station to replace breakers, installed in the late 1960s or early 1970s, at a cost of $8.4 million.
PJM also reviewed the 2018 RTEP assumptions. These include assumptions about transmission topology, load levels, system interchange and generation. Stakeholders were invited to offer input regarding 2018 alternative sensitivity studies and scenario analysis.
The Market Efficiency Update included the results of an acceleration analysis of reliability upgrades as well as an update on the remaining analyses of proposals submitted in the 2016/17 proposal window.
One project was chosen to be accelerated. Equipment upgrades at the Conastone and Peach Bottom 500-kV substations, set for 2021, will be moved up to 2020. Annual congestion savings are estimated at $4.4 million, while there is no perceived cost of acceleration.