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SCE details causes of 'false zeros' and sets Q4 2025 milestones for many fixes
Summary
Southern California Edison told the CPUC quarterly ICA workshop it has reduced some false-zero ICA results by addressing equipment-modeling conflicts and data gaps, published a biannual report Jan. 31, 2025, and set target dates — including Q4 2025 and Q3 2026 — for larger remediation and a forecast-capable load ICA (FLICA).
Southern California Edison presented its Integration Capacity Analysis methodology and remediation plans, telling stakeholders the company has made measurable reductions in circuits reporting zero available hosting capacity by addressing data and modeling defects.
SCE case manager Ari Altman outlined the regulatory background and said the IOUs published their first biannual ICA reports on Jan. 31, 2025 and that "ordering paragraph 35 of the October decision did require IOUs to hold a quarterly ICA public workshop," framing the requirement that led to the day’s presentations.
SCE engineers described the iterative ICA algorithm used to measure capacity against multiple technical criteria (steady-state voltage, voltage fluctuation, thermal limits, protection and operational flexibility) and said results are updated monthly on the utility’s external portal, Doctor PEP. Antonio (Tony) described the algorithm: "Once a criteria violation is seen ... the last recorded gen or load size is identified as the integration capacity for that study." Kate Torres, SCE ICA manager, said SCE is building a forecast-capable load ICA (FLICA) and expects to deliver FLICA by Q3 2026, with interim layers in Doctor PEP to bridge the gap.
On false zeros and inactive circuits: SCE engineers said a large share of the recent decrease in zero values came from fixing a modeling interaction that caused capacitor controls to trip a simulation prematurely. Armando, an ICA engineer, said that change — applied systemwide where circuits have been refreshed — was likely the single-largest cause of reduced zeros but that multiple simultaneous improvements make precise attribution difficult. SCE reported a decrease in the number of nodes with zero-hosting-capacity results: the "most-limiting-hour" metric declined about 24% year over year and the node-hour methodology declined about 14%.
SCE categorized inactive circuits into short-term and long-term remediation buckets and listed common short-term issues (primary meter connectivity and profiles, negative or malformed profiles, technical profile limitations and modeling gaps) with an estimated Q4 2025 completion target for many short-term fixes. Long-term items (complex topologies such as looped/meshed circuits and child substations that require field data collection or a long-term planning tool) are slated to be addressed as the company implements its long-term planning system in 2025–2026.
Portal updates: SCE’s product lead Lawrence Yonathan demonstrated Doctor PEP enhancements, including an "available load capacity" layer that extends to sub-transmission (bank-level) view, a five-year forecast toggle, a load-growth-penetration heat map and circuit-segment status markers showing inactive criteria and remediation status. Lawrence said some bug fixes were made to the UI earlier in 2025 and listed upcoming features including downloadable limited generation profile (LGP) files and further sub-transmission analysis.
Stakeholder questions focused on how SCE quantifies the impact of each methodological fix and on whether the company can provide circuit-level timelines and indicators so customers know which published ICA values are current. SCE committed to continue engaging stakeholders in quarterly workshops and to include remediation timelines in its biannual reports.
Ending: SCE said it will continue monthly ICA publishing while rolling remediation work into short-term fixes expected in Q4 2025 and long-term platform upgrades and FLICA delivery by Q3 2026.
