Tangibl was requested by our client, a transmission owner in the PJM Interconnection, to develop two different interconnection facilities studies in accordance with the PJM tariff. The first study, for a 208 MW natural-gas generating facility, included a 230 kV gas-insulated substation (GIS), 230 kV aerial transmission line taps from an existing 230 kV aerial line, and reconductoring of another 230 kV aerial transmission line that required upgrades to accommodate the interconnection. The physically congested area drove the decision to utilize GIS technology for the interconnection substation. The project was further complicated by its location in a refinery with environmental remediation expected in the low-lying area.
The second study, for a 785 MW combined-cycle natural-gas generating facility, included 230 kV aerial transmission attachment facilities to an existing line position in a 230 kV air-insulated substation, and reconductoring of two other 230 kV aerial transmission line requiring upgrades to accommodate the interconnection. The project was complicated by the need to relocate two other 230 kV aerial lines to different line positions in the same substation.
Both studies included scope, detailed cost build-up for the cost estimate, and project scheduling.