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NH — Power Infrastructure Updated 2026-01-08

New Hampshire

ISO-NE Solar Storage Queue Bottlenecks

Overview

New Hampshire’s power infrastructure buildout is small-scale and focused on solar. No major gas or nuclear plants are moving through the state siting process, and the only generation activity involves utility-owned solar arrays totaling less than 8 MW. ISO-NE’s queue reforms signal limited near-term capacity for new generation projects across the region.

Generation Projects

Solar

New Hampshire has two modest utility-scale solar projects under construction or in operation.

  • Kingston Solar Array (Unitil, 4.9 MW) is under construction and scheduled to come online in 2025, with first-year output estimated at 9.7 million kWh.[2][3]
  • Moultonborough Solar (New Hampshire Electric Cooperative, 2.59 MW) is operating and anchors the cooperative’s battery storage project.[3]

Transmission and Grid

Eversource is rebuilding the X-178 115 kV transmission line from Beebe River Substation to Whitefield Substation, with a 2025 application filed at the Site Evaluation Committee.[1][4]

Battery Storage

New Hampshire Electric Cooperative operates a 2.45 MW battery at the Moultonborough solar site, developed with ENGIE North America. The facility provides peak support and grid services for the cooperative’s territory.[5]

Interconnection Queue

ISO-NE’s Transitional Cluster Study, launched in October 2025, qualified 26 requests across New England, with only one in New Hampshire. More than 50 other requests remain in the queue under prior frameworks, signaling limited interconnection throughput for new projects in the state.[7]

What to Watch

  • ISO-NE cluster study outcomes — whether the one New Hampshire project in the Transitional Cluster Study advances and at what cost.
  • Utility resource planning — whether Unitil or NHEC file plans for larger solar or storage projects in response to load growth.
  • Data center siting — whether any major data center project emerges in New Hampshire and triggers new power procurement activity.

Sources

[1] New Hampshire Public Utilities Commission, “Docketbook 2025,” https://www.puc.nh.gov/VirtualFileRoom/DocketBook.aspx?DocketYear=2025 (accessed 2026-01-08).

[2] Unitil, “Kingston Solar Array,” https://unitil.com/energy-projects/kingston-solar-array (accessed 2026-01-08).

[3] Anne Fischer, “Construction begins on largest utility-owned solar project in New Hampshire,” pv magazine USA, 2024-02-26, https://pv-magazine-usa.com/2024/02/26/construction-begins-on-first-utility-owned-solar-project-in-new-hampshire/ (accessed 2026-01-08).

[4] New Hampshire Site Evaluation Committee, “SEC 2011-2021 Filings,” http://www.nhsec.nh.gov/projects/2021.htm (accessed 2026-01-08).

[5] New Hampshire Electric Cooperative, “Moultonborough Battery Storage,” https://www.nhec.com/mobo-battery-storage/ (accessed 2026-01-08).

[6] ISO New England, “Interconnection Request Queue,” https://www.iso-ne.com/system-planning/interconnection-service/interconnection-request-queue/ (accessed 2026-01-08).

[7] James Lowe (ISO New England), “ISO-NE begins interconnection Transitional Cluster Study,” ISO Newswire, 2025-10-20, https://isonewswire.com/2025/10/20/iso-ne-begins-interconnection-transitional-cluster-study/ (accessed 2026-01-08).