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MEPCO 345 kV Structure Replacement Project Update

MEPCO presents updated plan for replacing Section 388 structures based on stakeholder feedback. Cost-effective upgrades and minimized outage durations discussed.

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MEPCO 345 kV Structure Replacement Project Update

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  1. Planning Advisory Committee Meeting March 22, 2017 MEPCO 345 kV Structure Replacements(Response to Stakeholder Feedback) Chris Morin Manager Transmission Planning (CMP)

  2. Background • October 20th, 2016 PAC Meeting1 - CMP presented MEPCO 345 kV Structure Replacement Project • Described asset condition needs on 345 kV structures along Sections 388/3023, 396 and 3001 (total of 155 miles). • Presented alternatives and recommended solutions • Replace selected Section 396 and 3001 Structures – $16.9M • Replace all Section 388/3023 Structures – $101.6M • Total - $118.5M • Stakeholder feedback on recommended Section 388 solution: • Re-consider upgrading existing conductors now • This conductor upgrade was one of the alternatives considered in the Maine Resource Integration Study • Compare conductor upgrade (now vs. future) • Concerns about outage durations • https://www.iso-ne.com/static-assets/documents/2016/10/a4_mepco_345kv_structure_replacements.pdf

  3. Response to Stakeholders (Section 388) • The Section 388 conductor is approximately 50 years old • Deferring this conductor upgrade to the future would add an additional $31.8M to the overall cost as compared to including it as part of the base asset condition structure replacement project (i.e. $157.1M – $125.3M) • After follow-up investigation MEPCO found that outage durations could be further reduced, when including the re-conductor, without significantly impacting cost (previous assumption was four - three month seasonal outages) * All costs are in 2017 dollars

  4. Conclusion In response to stakeholder feedback, MEPCO has provided additional data for stakeholder consideration. • Section 388 conductors could be upgraded to bundled 1590 kcmilACSRas part of the initial structure replacement project for an additional $23.7M but would extend the required outage durations • Performing this upgrade now lowers the net present value cost by $31.8M (assuming a future need to upgrade these conductors) • This conductor upgrade was one of the alternatives considered in the Maine Resource Integration Study, but is not currently identified as a likely upgrade to address thermal issues based on the latest analysis for this study • MEPCO believes it is important to expedite this determination due to the poor condition of the Section 388 structures, in support of the targeted in service date of January 2019 Preliminary feedback from ISO-NE has indicated that a line re-conductor should not be pursued at this time since there is no defined need for this additional work which would result in significant additional outage durations.

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