{"id":"isone","rid":"ISONE","name":"ISO New England","flag":"🇺🇸","group":"us","type":"market","parent":null,"regions":null,"tier_range":null,"tier":3,"tier_name":"Workable","score":48,"pillar_score":53,"pillar_tier":3,"pillar_tier_name":"Workable","reliability":{"assessed":true,"level":"elevated","dock":5,"provisional":false,"confidence":"Med-High","delivery_transmission":{"level":"none"},"delivery_distribution":{"level":"none"},"forward_capacity":{"level":"elevated","measure":"assessed","note":"NERC's 2024 assessment rates New England elevated-risk: persistent winter natural-gas constraints plus electrification-driven demand growth could raise shortfall risk by 2026, and extreme cold could challenge reliability further.","sources":[{"label":"NERC 2024 Long-Term Reliability Assessment","url":"https://www.nerc.com/globalassets/our-work/assessments/2024-ltra_corrected_july_2025.pdf"}]},"read":"Reliability flags found","level_means":"reviewed; flags found"},"reliability_dock":5,"regulatory_momentum":{"level":"mixed","direction":"stable","why":"FERC's 18 June 2026 Section 206 show-cause order requires ISO-NE to justify or reform how large loads connect, in a capacity-constrained, high-cost system where new demand competes for tight winter adequacy.","what_would_change_it":"A Section 206 outcome that opens a workable large-load pathway without eroding ISO-NE's already tight capacity margin.","scope":"The regulatory and permitting environment for connecting a new large load. An opinion on a dated record, not a measurement.","vocabulary_version":"regulatory-momentum-1.0"},"scheduled_changes":null,"queue":{"active_gw":15,"wait_months":null,"has_detail":true,"wait_band":"4-5 years"},"friction":null,"connection_pathway":null,"service_evidence":{"contractual_service_held":false,"local_capacity_state":"not_assessed","local_capacity_depth":0,"cost_basis":null,"territory_count":32},"reliability_metrics":{"saidi_min":112.25,"saidi_year":"2024","forward_adequacy":null,"measure":"historical utility-territory delivery performance","standard":"MIXED","standard_note":"mixed methods: IEEE 94%; respondent-defined 6% of customers. Major event days are excluded throughout; the methods differ only in how those days are identified, a smaller difference than the spread between the utilities themselves. Constituents below carry their own standard.","evidence_role":"market_context","by_serving_utility":[{"customers":1462127,"saidi_minutes":66.1,"standard":"IEEE_STANDARD","state":"MA","utility":"NSTAR Electric Company","utility_id":54913,"weight":0.2015},{"customers":1345044,"saidi_minutes":90.72,"standard":"IEEE_STANDARD","state":"MA","utility":"Massachusetts Electric Co","utility_id":11804,"weight":0.1853},{"customers":1326461,"saidi_minutes":76.9,"standard":"IEEE_STANDARD","state":"CT","utility":"Connecticut Light & Power Co","utility_id":4176,"weight":0.1828},{"customers":679726,"saidi_minutes":215.4,"standard":"IEEE_STANDARD","state":"ME","utility":"Central Maine Power Co","utility_id":3266,"weight":0.0937},{"customers":551456,"saidi_minutes":81.5,"standard":"IEEE_STANDARD","state":"NH","utility":"Public Service Co of NH","utility_id":15472,"weight":0.076},{"customers":509231,"saidi_minutes":60.79,"standard":"IEEE_STANDARD","state":"RI","utility":"The Narragansett Electric Co","utility_id":13214,"weight":0.0702},{"customers":345159,"saidi_minutes":49.2,"standard":"IEEE_STANDARD","state":"CT","utility":"United Illuminating Co","utility_id":19497,"weight":0.0476},{"customers":275233,"saidi_minutes":281.4,"standard":"OTHER_STANDARD","state":"VT","utility":"Green Mountain Power Corp","utility_id":7601,"weight":0.0379},{"customers":165401,"saidi_minutes":478,"standard":"IEEE_STANDARD","state":"ME","utility":"Versant Power","utility_id":1179,"weight":0.0228},{"customers":85138,"saidi_minutes":514.88,"standard":"OTHER_STANDARD","state":"NH","utility":"New Hampshire Elec Coop Inc","utility_id":13441,"weight":0.0117},{"customers":79654,"saidi_minutes":97.66,"standard":"IEEE_STANDARD","state":"NH","utility":"Unitil Energy Systems","utility_id":24590,"weight":0.011},{"customers":45565,"saidi_minutes":92.69,"standard":"IEEE_STANDARD","state":"NH","utility":"Liberty Utilities (Granite State Electri","utility_id":26510,"weight":0.0063},{"customers":40741,"saidi_minutes":231.8,"standard":"IEEE_STANDARD","state":"VT","utility":"Vermont Electric Cooperative, Inc","utility_id":19791,"weight":0.0056},{"customers":39242,"saidi_minutes":192.98,"standard":"IEEE_STANDARD","state":"MA","utility":"City of Taunton","utility_id":18488,"weight":0.0054},{"customers":32638,"saidi_minutes":23.24,"standard":"IEEE_STANDARD","state":"MA","utility":"Town of Reading - (MA)","utility_id":15748,"weight":0.0045},{"customers":30873,"saidi_minutes":64.6,"standard":"IEEE_STANDARD","state":"MA","utility":"Fitchburg Gas & Elec Light Co","utility_id":6374,"weight":0.0043},{"customers":25100,"saidi_minutes":37.15,"standard":"OTHER_STANDARD","state":"CT","utility":"Town of Wallingford - (CT)","utility_id":20038,"weight":0.0035},{"customers":20898,"saidi_minutes":287.98,"standard":"IEEE_STANDARD","state":"CT","utility":"City of Norwich - (CT)","utility_id":13831,"weight":0.0029},{"customers":18194,"saidi_minutes":46.12,"standard":"IEEE_STANDARD","state":"MA","utility":"City of Westfield - (MA)","utility_id":20481,"weight":0.0025},{"customers":17557,"saidi_minutes":61.58,"standard":"IEEE_STANDARD","state":"MA","utility":"City of Holyoke - (MA)","utility_id":8774,"weight":0.0024},{"customers":16991,"saidi_minutes":19.14,"standard":"OTHER_STANDARD","state":"MA","utility":"Town of Middleborough - (MA)","utility_id":12473,"weight":0.0023},{"customers":16986,"saidi_minutes":16.6,"standard":"OTHER_STANDARD","state":"MA","utility":"Town of Shrewsbury - (MA)","utility_id":17127,"weight":0.0023},{"customers":16598,"saidi_minutes":2.53,"standard":"IEEE_STANDARD","state":"MA","utility":"Town of Braintree - (MA)","utility_id":2144,"weight":0.0023},{"customers":16301,"saidi_minutes":24.8,"standard":"IEEE_STANDARD","state":"MA","utility":"City of Norwood - (MA)","utility_id":13839,"weight":0.0022},{"customers":14149,"saidi_minutes":22.48,"standard":"IEEE_STANDARD","state":"CT","utility":"Groton Dept of Utilities - (CT)","utility_id":7716,"weight":0.0019},{"customers":13995,"saidi_minutes":50.4,"standard":"IEEE_STANDARD","state":"MA","utility":"Nantucket Electric Co","utility_id":13206,"weight":0.0019},{"customers":13894,"saidi_minutes":5.95,"standard":"IEEE_STANDARD","state":"MA","utility":"Town of North Attleborough - (MA)","utility_id":13679,"weight":0.0019},{"customers":13515,"saidi_minutes":72.39,"standard":"OTHER_STANDARD","state":"MA","utility":"Town of Hudson - (MA)","utility_id":8973,"weight":0.0019},{"customers":13425,"saidi_minutes":18,"standard":"OTHER_STANDARD","state":"MA","utility":"Town of Danvers","utility_id":5480,"weight":0.0018},{"customers":13213,"saidi_minutes":737.19,"standard":"IEEE_STANDARD","state":"ME","utility":"Eastern Maine Electric Coop","utility_id":5609,"weight":0.0018},{"customers":10504,"saidi_minutes":9.96,"standard":"IEEE_STANDARD","state":"MA","utility":"Town of Mansfield - (MA)","utility_id":11586,"weight":0.0014},{"customers":2791,"saidi_minutes":184.12,"standard":"IEEE_STANDARD","state":"CT","utility":"Bozrah Light & Power Company","utility_id":2089,"weight":0.0004}],"evidence_role_basis":"comparison and monitoring only: a customer-weighted regional blend is not the record of the utility that would serve a specific site"},"forward_cost":{"level":"Moderate","price":"$3.58 per kW-month","period":"2027/28 (FCA 18)"},"tariff":null,"realized_cost":null,"cost_availability":{"label":"Availability varies by jurisdiction","means":"The jurisdictions inside this region hold different cost-evidence states, in some cases opposite ones. No single regional availability is published, because any one of them would be false somewhere in the footprint.","user_action":"Identify the jurisdiction the site sits in and read that record. Do not apply one jurisdiction's conclusion to the region.","class":"varies_by_jurisdiction","band_published":true},"cost_evidence_state":{"label":"Observable in part; complete cost fragmented by jurisdiction","means":"Part of the cost is established from a filed, applicable tariff and is published. The remainder is set by many serving utilities across several jurisdictions, so no single figure exists at this market's geographic scope. The gap is not missing research; it is a scope the evidence cannot span.","remedy":"Narrow to one serving utility and interconnection point, then apply that utility's local transmission and distribution tariff. No region-wide document will close it, because no regional body sets these charges.","answerable":"partially","state":"scope_fragmented","also_holds":[],"vocabulary_version":"evidence-state-1.1"},"jurisdiction_evidence":null,"cost_structure":null,"cost_withdrawn":{"defect":"#320","status":"scope_unsupported","reason":"A single delivered-cost estimate cannot be defended at ISO-NE-wide scope. The regional transmission layer is uniform and verifiable, but local transmission, distribution and retail demand charges are set by 32 serving utilities across six states and five regulators. The superseded values are recorded in the correction record, not here.","notice":"Region-wide delivered-cost estimate withdrawn. PowerGridIQ verifies approximately $21.57/MWh of current regional ISO-NE transmission charges for the standard archetype. A complete delivered-cost estimate is not available at the ISO-NE-wide level because local transmission, distribution and demand charges vary across 32 serving utilities and multiple state jurisdictions.","withdrawn":"2026-08-24","restore_when":"A serving utility and interconnection point are specified, so a local transmission and distribution tariff can be applied. This is a change of scope rather than a research task: no ISO-NE-wide figure will become available, because ISO-NE is not the entity that sets one.","related_defects":[],"evidence":"ISO-NE General Business Practices Section 2, version 31 July 2026: Pool RNS Rate $177.62722/kW-yr and OATT Schedule 1 Rate $1.87420/kW-yr. ISO-NE Transmission Service Types: Regional Network Service uses Pool Transmission Facilities; Local Transmission Service uses non-pool facilities. See isone_transmission_evidence.py.","surfaces_affected":["/rating/isone","/api/v1/ratings/isone","/api/v1/ratings","/api/v1/screen","/api/v1/best","/realized-cost","shortlist","market memo","structured exports","pgiq-data.json"],"consequence":"No delivered-cost band is published for this market. Cost-dependent conclusions return insufficient_evidence rather than a substituted value."},"cost_correction":{"defect":"#320","status":"withdrawn_scope_unsupported","withdrawn":"2026-08-24","corrected":"2026-08-24","headline":"ISO New England region-wide delivered-cost estimate withdrawn","version":"cost-correction-1.0","defects_closed":[],"full_record_and_superseded_values_at":"https://powergridiq.com/data/corrections.json","url":"https://powergridiq.com/corrections#isone"},"carbon_correction":null,"carbon_official_reference":null,"partial_cost_verified":{"label":"Verified regional transmission only","currency":"USD","usd_per_mwh":21.57,"is_complete_delivered_cost":false,"covers":["regional transmission (OATT Schedule 9 Regional Network Service)","ISO scheduling, system control and dispatch (OATT Schedule 1)"],"does_not_cover":["local transmission (non-pool facilities, OATT Schedule 21)","distribution","retail demand charges","state and local taxes and utility riders","energy","capacity","market ancillary services"],"provenance_state":"tariff_derived","statement":"PowerGridIQ can verify approximately $21.57/MWh of current regional ISO-NE transmission charges for the standard archetype. A complete delivered-cost estimate is not available at the ISO-NE-wide level because local transmission, distribution and demand charges vary across 32 serving utilities and multiple state jurisdictions.","must_not_be_used_as":["a delivered-cost total","a cost-band midpoint","the low end of a band","a substitute for the withdrawn estimate","an input to the cost pillar"],"components":[{"name":"Regional Network Service (OATT Schedule 9)","usd_per_mwh":21.34,"rate":"$177.62722/kW-yr","effective":"through 2026-12-31","billing_determinant":"Monthly Network Load (kW-month)","formula":"$177.62722/kW-yr x 100,000 kW / 832,200 MWh","provenance_state":"tariff_derived","geographic_applicability":"uniform across the entire New England Balancing Authority Area"},{"name":"Scheduling, System Control and Dispatch (OATT Schedule 1)","usd_per_mwh":0.23,"rate":"$1.87420/kW-yr","effective":"from 2026-06-01","billing_determinant":"Monthly Network Load (kW-month)","formula":"$1.87420/kW-yr x 100,000 kW / 832,200 MWh","provenance_state":"tariff_derived","geographic_applicability":"uniform across the New England BAA"}],"scheduled_change":{"usd_per_mwh":22.29,"effective":"2027-01-01","rate":"Pool RNS Rate rises to $183.59911/kW-yr","status":"scheduled, not included in the current figure"},"unavailable_layers":{"local_transmission":{"state":"varies_by_jurisdiction","set_by":"each Participating Transmission Owner, OATT Schedule 21"},"distribution":{"state":"varies_by_jurisdiction","set_by":"each serving utility, approved by its state commission"},"retail_demand_charges":{"state":"varies_by_jurisdiction","set_by":"the serving utility's retail tariff"}},"complete_delivered_cost":"insufficient_evidence","next_action":"Identify the serving utility for the specific interconnection point and apply its current local transmission and distribution tariff. These are set at the utility and state level and exist nowhere regionally.","serving_utilities_in_footprint":32,"states":6,"evidence_module":"isone_transmission_evidence.py","version":"partial-cost-1.0"},"cost_pillar_calculation":null,"evidence":{"source_reliability":"High","coverage":"Substantial","coverage_dimensions":2,"last_reviewed":"June 2026","measured_layers":3,"data_layers":3,"layers":[{"layer":"PGIQ Rating opinion","method":"opinion","vintage":"June 2026","freshness":"Current","source_url":"https://powergridiq.com/methodology"},{"layer":"Reliability","method":"measured","vintage":"2024","freshness":"Fresh","source_url":"https://www.eia.gov/electricity/data/eia861/"},{"layer":"Forward cost","method":"measured","vintage":"2027/28 (FCA 18)","freshness":"Fresh","source_url":"https://www.utilitydive.com/news/new-england-iso-ne-capacity-prices-rise/708322/"},{"layer":"Interconnection queue","method":"measured","vintage":"end-2025 (LBNL 2026)","freshness":"Fresh","source_url":"https://emp.lbl.gov/queues"}]},"outlook":"Stable","confidence":"High","under_review":true,"thesis":"Small, expensive and winter-gas-constrained, with an offshore-wind-heavy pipeline slow to land. Workable, not a magnet.","pillars":{"access":52,"availability":50,"cost":null,"momentum":45,"carbon":63},"pillar_rationale":{"access":"Workable access with faster studies than most US ISOs (~3.6 yr), but a small, constrained system.","availability":"Tight availability, especially winter gas constraints.","cost":"Not assessed. The region-wide delivered-cost estimate was withdrawn under #320: regional transmission of about $21.57/MWh is verified and tariff-derived, but local transmission, distribution and demand charges are set by 32 serving utilities across six states, so no single ISO-NE figure exists. The verified partial is deliberately not scored, because a fraction of a delivered cost read as a whole one would flatter the pillar.","momentum":"Lower momentum; offshore-wind-led pipeline is slow.","carbon":"Carbon moderate (~240 g)."},"offtake_opportunity_index":null,"demand_hunger":null,"build_feasibility":52,"supplier_signals":{"bess_arbitrage_usd_mwh":36,"bess_arbitrage_pct":62,"solar_capture_pct":104,"wind_capture_pct":99,"effective_competing_supply_gw":3.8},"outlook_drivers":{"upgrade":["Offshore wind energizes at scale.","Transmission upgrades ease winter constraints."],"downgrade":["Winter gas-supply stress.","Offshore-wind delays persist."]},"risks":["Winter reliability and gas dependence.","Slow offshore-wind pipeline."],"peers":{"like":"NYISO (small, constrained, pricey)","ahead":"on study speed","behind":"on scale"},"sources":[{"label":"ISO-NE / regional data","url":"https://www.iso-ne.com/"}],"latest_action":{"date":"Jun 2026","type":"Affirmed","note":"Named in the FERC show-cause suite; preliminary stage, tier holds, monitoring.","trigger":"FERC Section 206 show-cause order (18 Jun 2026)"},"grid":{"price_usd_mwh":58,"carbon_intensity_g":260,"renewable_pct":31,"renewable_generation_share_pct":31,"low_carbon_generation_share_pct":53,"fuel_mix":{"gas":42,"nuclear":22,"hydro":9,"wind":9,"solar":5,"biofuel":8,"oil":4,"storage":1},"demand_mw":11800,"capacity_mw":28000,"imports_mw":1000,"exports_mw":200,"firm_capacity_mw":null,"firm_capacity_availability":"insufficient_evidence","firm_capacity_basis":null,"est_peak_mw":17700,"firm_headroom_mw":null,"firm_headroom_availability":"dependency_unavailable","peak_stress_pct":null,"peak_stress_availability":"dependency_unavailable","adequacy_required_input":"capacity_mix_mw with a declared basis, or an official dependable or accredited capacity from the operator","price_cycle":"other","price_basis":"not_reviewed","price_absent_reason":null,"price_source":"modelled-baseline","price_as_of":null,"price_vintage":"undated_modelled_baseline","price_is_live":false,"carbon_intensity_unit":"gCO2eq/kWh","carbon_measurement_boundary":"operational_combustion","carbon_calculation_method":"structural_estimate","carbon_emission_factor_source":null,"carbon_basis_withdrawn":true,"carbon_imports_treatment":"not_accounted","carbon_provenance_state":"structural","carbon_decision_eligibility":"insufficient_evidence","carbon_confidence":"low","source":"modelled-baseline"},"evidence_depth":{"use_case":"project_case","use_case_label":"Standardized Project Case","overall":"not_assessed","overall_permits":"Not assessed. Treat as an open diligence item; absence of a finding is not evidence of low risk.","insufficient_evidence":true,"unassessed_required_fields":["cost"],"project_ready":false,"blocking_fields":["cost","connection","reliability"],"fields":{"cost":"not_assessed","connection":"M2 Compiled","reliability":"M2 Compiled","carbon":"M2 Compiled","regulatory":"M2 Compiled","local_capacity":"not_assessed"},"by_use_case":{"discovery":{"label":"Discovery and monitoring","matrix_version":"1.0","tier":"not_assessed","ready":false,"blocking_fields":["cost","connection"],"insufficient_evidence":true,"why":"not assessed here: cost"},"market_comparison":{"label":"Market comparison","matrix_version":"1.0","tier":"not_assessed","ready":false,"blocking_fields":["cost","connection","reliability"],"insufficient_evidence":true,"why":"not assessed here: cost"},"project_case":{"label":"Standardized Project Case","matrix_version":"1.0","tier":"not_assessed","ready":false,"blocking_fields":["cost","connection","reliability"],"insufficient_evidence":true,"why":"not assessed here: cost"},"project_case_carbon":{"label":"Project Case with a carbon requirement","matrix_version":"1.0","tier":"not_assessed","ready":false,"blocking_fields":["cost","connection","reliability","carbon"],"insufficient_evidence":true,"why":"not assessed here: cost"},"site_diligence":{"label":"Conditional site diligence","matrix_version":"1.0","tier":"not_assessed","ready":false,"blocking_fields":["cost","connection","reliability","local_capacity"],"insufficient_evidence":true,"why":"not assessed here: cost, local capacity"}},"reliability_layers":{"bulk_historical":{"state":"unknown","method":null},"forward_adequacy":{"state":"held","method":"assessed"},"local_delivery":{"state":"held","method":"measured"},"contractual_service":{"state":"unknown","method":null},"designed_site_resilience":{"state":"unknown","method":null}},"definition_version":"carbon_scope@1.0;connection_process@1.0;cost_archetype@1.0;evidence_tiers@1.0;reliability_layers@1.0","scale":"M1 broad / M2 compiled / M3 project-ready / M4 local; cumulative, so each tier includes the ones below it. Assigned per field from held evidence with provenance. Not a rating strength, confidence score or feasibility conclusion."},"next_review":"2026-10-15","report_url":"https://powergridiq.com/rating/isone","as_of":"June 2026","evidence_layers":{"version":"evidence-layers-1.0","band":{"state":"withdrawn","label":"Withdrawn","means":"A band was published, found unsupported, and removed under a dated correction.","reproducible":false},"component":null,"cost_pillar":{"state":"not_assessed","label":"Not assessed","means":"No cost pillar is published for this market.","reproducible":false},"layers_are_independent":"Band, component and cost-pillar evidence are separate judgments. A market may have a sound, applicable band and an illustrative component breakdown at the same time. Do not read a component-evidence limitation as a statement about the band."}}