Regulators are set to increase the cost cap for building a new transmission line from the Tehachapi Mountains into Southern California Edison service territory from $257 million to $746 million. In a California Public Utilities Commission proposed decision August 25, the transmission project, called Antelope, is based on the utility\u2019s recalculation of construction costs. Financing is expected to add another $77.3 million. In part, the increased cost is due to building the transmission towers 20 feet higher than originally expected in order to mitigate electro-magnetic fields. Also noted is some re-routing to accommodate wind developer requirements. The lines are originally set to transfer 220 kV, with the option to increase transmission to 500 kV. The project encompasses about 70 miles of new lines, according to Edison. The cost cap excludes the accounting for \u201cfunds used during construction.\u201d That account adds financing costs into the mix once the construction is complete. Edison estimates that would amount to $77.3 million. Another account for the Antelope line is \u201cconstruction work in progress.\u201d The commission\u2019s proposed decision notes that federal regulators already have established and approved the account. The proposed decision added that Edison expects the \u201cvast majority\u201d of financing costs to come in through the \u201cin progress\u201d account. No amount is given in the CPUC document for the cost of that account.