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Utility Files Proposal To Serve 50% Of Mass Market Default Service From ISO Market Purchases
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Public Service of New Hampshire (Eversource) has filed a proposal to serve 50% of its small customer group default service load from ISO New England market purchases, for the August 2025 to January 2026 period
As previously reported, the PUC had directed PSNH to propose to serve "at least" 50% of small customer SOS under ISO-NE market purchases
PSNH said that it proposed to use 50% ISO market purchases for small customer default service, and not a higher amount, because the reliance on ISO market purchases shifts risks to customers from wholesale suppliers. Additionally, PSNH noted that it only recently finished the pricing period which first relied on only 12.5% ISO market purchases for small customer SOS (with full impacts not yet studied), and that the impact from moving to 30% market purchases (which started this month) is not yet known
PSNH would specifically rely on the day-ahead market for the 50% of the default service (energy service) supplies to be served by ISO-NE market purchases
For the 50% of load that would be served through the ISO-NE market purchases, PSNH is not proposing to make any forward energy purchases or implement any other hedging strategies to mitigate price or load volatility. PSNH would be a price-taker at whatever price level the ISO-NE market settles.
As the PUC had only required PSNH to file a proposal for 50% ISO market purchases (rather than outright adopting such), PSNH also offered to maintain the current level of 30% ISO market purchases for the August 2025 to January 2026 period, which PSNH said would allow for further evaluation of self-supply pricing
PSNH noted that, in a separate docket, it has a pending proposal to make default service reconciliations nonbypassable.
PSNH further noted that administrative costs of default service may increase as the percentage of self-supply ISO purchases increases. PSNH said that its working capital needs will likely increase as the self-supply percentage increases, due to the shorter ISO settlement timeline versus paying a full requirements supplier
PSNH already relies on ISO-NE market purchases for 100% of large customer SOS
Docket DE 24-046
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February 10, 2025
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Copyright 2025 EnergyChoiceMatters.com
Reporting by Paul Ring • ring@energychoicematters.com
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