{ "as_of": "2026-09-10", "coverage": "All 18 entries reviewed. Thirteen formerly unrefreshed proposals now have a current status or explicitly bounded planning evidence. Five prior refreshed entries are reused, with a further Grimsel 4 construction-start update. No inference that listing, concession or engineering award equals a financed operating asset.", "projects": [ { "name": "Chummensee", "canton": "VS", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "groupe-e-chummensee", "project_stage": "feasibility_studies", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": null, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": null, "capex_chf_million": null, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "groupe-e-chummensee", "fmv-projects-2026", "vs-hydro-plan-2025" ], "latest_evidence_date": "2026-06-12", "note": "Partnership announced 6 November 2025; design variants and finance open. Earlier cantonal 179 GWh winter potential is not a final project design.", "source_links": [ { "id": "groupe-e-chummensee", "url": "https://www.groupe-e.ch/de/ueber-groupe-e/medien/pressemitteilungen/Wasserkraftprojekt-Chummensee", "publisher": "Groupe E / GKW / FMV", "publication_date": "2025 date to verify", "evidence_status": "primary_text_archived_via_web_reader_original_failed" }, { "id": "fmv-projects-2026", "url": "https://www.strom.ch/system/files/media/documents/FMV_GV2026_MM_D_12.06.2026.pdf", "publisher": "FMV", "publication_date": "2026-06-12", "evidence_status": "original_response_archived_reviewed" }, { "id": "vs-hydro-plan-2025", "url": "https://www.vs.ch/documents/23442489/43527349/E.4%2BProduction%2Bd_energie%2Bhydroelectrique_28112025.pdf/e05e2c14-a3f2-ad72-c494-8bb5cb77559a?t=1764245727393&v=1.0", "publisher": "Canton Valais", "publication_date": "2025-11-28", "evidence_status": "original_response_archived_reviewed" } ] }, { "name": "Curnera-Nalps", "canton": "GR", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "gr-hydro-response-2026", "project_stage": "not_currently_pursued_by_operator", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": 100, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": null, "capex_chf_million": null, "unsubsidized_viability_status": "operator_says_current_storage_already_economically_optimized", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "gr-hydro-response-2026" ], "latest_evidence_date": "2026-02-18", "winter_energy_definition": "Dormant proposal for seasonal shift, not assured production.", "source_links": [ { "id": "gr-hydro-response-2026", "url": "https://cdws-staka-gr.gr.ch/cdws/files/b6dc6fb7ba934d6480fe91a42496dfc7-332/25/pdf", "publisher": "Canton Graubünden", "publication_date": "2026 date to verify", "evidence_status": "original_response_archived_reviewed" } ] }, { "name": "Gorner", "canton": "VS", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "alpiq-gornerli-sizing-2026", "project_stage": "design_and_pre_permitting", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": 550, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": "2035 operator target, conditional", "capex_chf_million": 510, "unsubsidized_viability_status": "not_demonstrated_support_possible", "in_assured_2050_supply": false, "winter_energy_definition": "Full-development winter storage capacity, not annual incremental natural production and not assured by 2050", "phased_winter_storage": [ { "year": 2040, "gwh": 435, "status": "operator projection conditional on completion" }, { "year_range": [ 2045, 2060 ], "gwh": 550, "status": "full potential depends on glacier retreat/climate scenario" } ], "published_potential_grant_pct": 60, "grant_status": "possible maximum, formal decisions pending", "review_classification": "reused_prior_refresh", "source_links": [ { "id": "alpiq-gornerli-sizing-2026", "url": "https://www.alpiq.com/newsroom/news-stories/a-major-milestone-has-been-reached-by-gornerli-multi-purpose-reservoir", "publisher": "Alpiq", "publication_date": "2026-05-20", "evidence_status": "reused_original_archive" } ] }, { "name": "Gougra", "canton": "VS", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "alpiq-moiry-2026", "project_stage": "preferred_variant_and_permit_preparation", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": null, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": "2029 possible construction start; approximately four years works, conditional", "capex_chf_million": 120, "unsubsidized_viability_status": "not_demonstrated_possible_60pct_grant_not_awarded", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "alpiq-moiry-2026", "vs-moiry-cost-2026" ], "latest_evidence_date": "2026-05-21", "additional_winter_energy_gwh_range": [ 40, 50 ], "note": "Moiry raising approximately 9 m. Seasonal transfer, not annual generation. New pump flow 5 m3/s is not a 5 MW rating. Concession expiry 2039 and residual-value agreement matter.", "source_links": [ { "id": "alpiq-moiry-2026", "url": "https://www.alpiq.com/fr/newsroom/news-stories/une-contribution-essentielle-a-la-securite-dapprovisionnement-hivernal", "publisher": "Alpiq / Forces Motrices de la Gougra", "publication_date": "2026-05-21", "evidence_status": "reused_original_archive" }, { "id": "vs-moiry-cost-2026", "url": "https://www.vs.ch/web/strategie-eau/w/rehaussement-du-barrage-de-moiry", "publisher": "Canton Valais", "publication_date": "2026-05-04", "evidence_status": "reused_original_archive" } ] }, { "name": "Griessee", "canton": "VS", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "fmv-projects-2026", "project_stage": "development_by_fmv", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": 43, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": null, "capex_chf_million": null, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "fmv-projects-2026", "vs-hydro-plan-2025" ], "latest_evidence_date": "2026-06-12", "winter_energy_definition": "Published planning winter-energy potential; engineering and finance remain open.", "source_links": [ { "id": "fmv-projects-2026", "url": "https://www.strom.ch/system/files/media/documents/FMV_GV2026_MM_D_12.06.2026.pdf", "publisher": "FMV", "publication_date": "2026-06-12", "evidence_status": "original_response_archived_reviewed" }, { "id": "vs-hydro-plan-2025", "url": "https://www.vs.ch/documents/23442489/43527349/E.4%2BProduction%2Bd_energie%2Bhydroelectrique_28112025.pdf/e05e2c14-a3f2-ad72-c494-8bb5cb77559a?t=1764245727393&v=1.0", "publisher": "Canton Valais", "publication_date": "2025-11-28", "evidence_status": "original_response_archived_reviewed" } ] }, { "name": "Grimselsee", "canton": "BE", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "kwo-grimsel-raising", "project_stage": "cantonal_concession_granted_building_permit_next", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": 240, "incremental_reservoir_energy_gwh": 240, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": null, "capex_chf_million": null, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "kwo-grimsel-raising", "kwo-grimsel-concession-2026" ], "latest_evidence_date": "2026-09-09", "note": "Operator reports 152 unanimous votes early in week of 7 September. Raising 23 m, 94 to 170 million m3, 270 to 510 GWh. Concession is not a building permit or final investment decision.", "source_links": [ { "id": "kwo-grimsel-raising", "url": "https://kwo-prod.fra1.cdn.digitaloceanspaces.com/files/Projekte/Projektblatt_Vergro%CC%88sserung-Grimselsee_KWO_neu.pdf", "publisher": "KWO", "publication_date": "undated", "evidence_status": "primary_text_archived_via_web_reader_original_failed" }, { "id": "kwo-grimsel-concession-2026", "url": "https://de.linkedin.com/pulse/grosser-rat-spricht-konzession-f%C3%BCr-grimselseevergr%C3%B6sserung-p7wse", "publisher": "KWO via official LinkedIn post", "publication_date": "2026-09-09", "evidence_status": "original_response_archived_reviewed" } ] }, { "name": "Lac d’Emosson", "canton": "VS", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "emosson-annual-2025", "project_stage": "surESA_preliminary_study_binational_framework", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": null, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": null, "capex_chf_million": null, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "emosson-annual-2025", "alpiq-projects-2026", "vs-hydro-plan-2025" ], "latest_evidence_date": "2026-06-08", "note": "2025 report: geological/seismic work and preliminary report, no FID. Cantonal older 58 GWh winter potential retained as historical evidence, not a reconciled current binational quantity.", "source_links": [ { "id": "emosson-annual-2025", "url": "https://emosson.ch/fileadmin/user_upload/documents/Communiques/Emosson_rapport_gestion_2025_digital_DEF.pdf", "publisher": "Electricité d Emosson", "publication_date": "2026-06-08 publication announcement", "evidence_status": "original_response_archived_reviewed" }, { "id": "alpiq-projects-2026", "url": "https://www.alpiq.com/newsroom/news-stories/alpiq-is-pressing-ahead-with-its-projects", "publisher": "Alpiq", "publication_date": "2026-07-04 date locale to verify", "evidence_status": "original_response_archived_reviewed" }, { "id": "vs-hydro-plan-2025", "url": "https://www.vs.ch/documents/23442489/43527349/E.4%2BProduction%2Bd_energie%2Bhydroelectrique_28112025.pdf/e05e2c14-a3f2-ad72-c494-8bb5cb77559a?t=1764245727393&v=1.0", "publisher": "Canton Valais", "publication_date": "2025-11-28", "evidence_status": "original_response_archived_reviewed" } ] }, { "name": "Lac des Toules", "canton": "VS", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "vs-hydro-plan-2025", "project_stage": "cantonal_planning_designation_current_investment_stage_unresolved", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": 74, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": null, "capex_chf_million": null, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "vs-hydro-plan-2025", "romande-toules-2026" ], "latest_evidence_date": "2026-05-25", "winter_energy_definition": "Older 2023 planning estimate in 2025 cantonal plan, not a current bankable forecast.", "note": "Plan describes a new higher dam at the existing site. Reglee is spatial coordination, not construction authorization. Current operator description does not supply a project budget or schedule.", "source_links": [ { "id": "vs-hydro-plan-2025", "url": "https://www.vs.ch/documents/23442489/43527349/E.4%2BProduction%2Bd_energie%2Bhydroelectrique_28112025.pdf/e05e2c14-a3f2-ad72-c494-8bb5cb77559a?t=1764245727393&v=1.0", "publisher": "Canton Valais", "publication_date": "2025-11-28", "evidence_status": "original_response_archived_reviewed" }, { "id": "romande-toules-2026", "url": "https://www.romande-energie.ch/blog/comment-les-barrages-suisses-faconnent-notre-energie-immersion-au-barrage-des-toules", "publisher": "Romande Energie", "publication_date": "2026-05-25", "evidence_status": "original_response_archived_reviewed" } ] }, { "name": "Lago del Sambuco", "canton": "TI", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "ofima-annual-2025", "project_stage": "design_contract_awarded", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": null, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": null, "capex_chf_million": null, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "ofima-annual-2025" ], "latest_evidence_date": "FY2024/25 report; publication day unresolved", "note": "Consorzio Alpigia: Lombardi SA, IM Maggia Engineering SA, Gruner Stucky Ltd. Raising plus Peccia modernization/balancing basin; engineering award does not establish construction FID. Earlier archive already contains this report.", "source_links": [ { "id": "ofima-annual-2025", "url": "https://www.ofima.ch/wp-content/uploads/2026/03/OFI_20_10-OFIMA-Relazione-Esercizio-2024-25-IT-DEF-web.pdf", "publisher": "Ofima", "publication_date": null, "evidence_status": "reused_original_archive" } ] }, { "name": "Lai da Marmorera", "canton": "GR", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "gr-hydro-response-2026", "project_stage": "preliminary_design_road_and_concession_dependencies", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": 50, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": "Implementation realistically after concession renewal in 2035; completion unspecified", "capex_chf_million": null, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "gr-hydro-response-2026" ], "latest_evidence_date": "2026-02-18", "note": "ASTRA estimates at least 14 years for Julier road planning/building. Seasonal shifting proposal, not committed capacity.", "source_links": [ { "id": "gr-hydro-response-2026", "url": "https://cdws-staka-gr.gr.ch/cdws/files/b6dc6fb7ba934d6480fe91a42496dfc7-332/25/pdf", "publisher": "Canton Graubünden", "publication_date": "2026 date to verify", "evidence_status": "original_response_archived_reviewed" } ] }, { "name": "Mattmarksee", "canton": "VS", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "axpo-mattmark-2025", "project_stage": "raising_variant_under_study", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": 60, "incremental_reservoir_energy_gwh": 60, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": null, "capex_chf_million": 83, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "axpo-mattmark-2025" ], "latest_evidence_date": "2025-01-16", "note": "10 m raising, about 18% more volume and four years works. Environmental, concession/residual-value and economic conditions unresolved; no extra annual generation.", "source_links": [ { "id": "axpo-mattmark-2025", "url": "https://www.axpo.com/ch/de/newsroom/medienmitteilungen/2025/staudamm-mattmark-erhoehung-um-zehn-meter-wird-geprueft.html", "publisher": "Axpo / KWM", "publication_date": "2025-01-16", "evidence_status": "reused_primary_web_reader_original_download_failed" } ] }, { "name": "Oberaarsee", "canton": "BE", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "kwo-oberaar", "project_stage": "rough_feasibility_study", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": 65, "incremental_reservoir_energy_gwh": 65, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": null, "capex_chf_million": null, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "kwo-oberaar" ], "latest_evidence_date": "undated operator page retrieved 2026-09-10", "note": "10 m raising and 17 million m3 more volume; annual generation unchanged. Grimselsee and Trift take priority.", "source_links": [ { "id": "kwo-oberaar", "url": "https://www.grimselstrom.ch/projekte/vergroesserung-oberaarsee", "publisher": "KWO", "publication_date": "undated", "evidence_status": "primary_text_archived_via_web_reader_original_failed" } ] }, { "name": "Oberaletsch klein", "canton": "VS", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "alpiq-projects-2026", "project_stage": "other_partners_takeover_identity_and_current_stage_unresolved", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": 54, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": 40, "incremental_pump_mw": null, "commissioning_target": null, "capex_chf_million": null, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "alpiq-projects-2026", "vs-hydro-plan-2025" ], "latest_evidence_date": "2026-04-07", "winter_energy_definition": "Older 2023 cantonal planning estimate; not a confirmed new operator design.", "note": "Different project from Oberaletsch Gross (400 MW/765 GWh planning concept). Do not merge.", "source_links": [ { "id": "alpiq-projects-2026", "url": "https://www.alpiq.com/newsroom/news-stories/alpiq-is-pressing-ahead-with-its-projects", "publisher": "Alpiq", "publication_date": "2026-07-04 date locale to verify", "evidence_status": "original_response_archived_reviewed" }, { "id": "vs-hydro-plan-2025", "url": "https://www.vs.ch/documents/23442489/43527349/E.4%2BProduction%2Bd_energie%2Bhydroelectrique_28112025.pdf/e05e2c14-a3f2-ad72-c494-8bb5cb77559a?t=1764245727393&v=1.0", "publisher": "Canton Valais", "publication_date": "2025-11-28", "evidence_status": "original_response_archived_reviewed" } ] }, { "name": "Reusskaskade", "canton": "UR", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "ckw-reuss-2026", "project_stage": "next_design_phase_started", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": 60, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": "Design to spring 2027, earliest works 2029; conditional", "capex_chf_million": null, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "review_classification": "refreshed_or_bounded_this_pass", "source_ids": [ "ckw-reuss-2026" ], "latest_evidence_date": "2026-07-09", "note": "Goescheneralp 15 m raising, 28% more volume. 60 GWh winter applies to whole Goescheneralp-Wassen-Amsteg cascade. Slight annual increment unquantified. Concession expires 2043; compensation/economics open.", "source_links": [ { "id": "ckw-reuss-2026", "url": "https://www.ckw.ch/ueber-ckw/medienstelle/medienmitteilungen/2026/dammerhoehung-goescheneralpsee-kwg-startet-naechste-planungsphase", "publisher": "CKW / KWG", "publication_date": "2026-07-09", "evidence_status": "original_response_archived_reviewed" } ] }, { "name": "Trift", "canton": "BE", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "kwo-trift-access-2026", "project_stage": "alternative_access_under_study", "incremental_natural_generation_gwh_per_year": null, "additional_winter_energy_gwh": null, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": null, "capex_chf_million": null, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "project_status_note": "Operator reports blocked municipal talks and assesses Aaretal access; no completed project approval or construction commitment established by this source", "review_classification": "reused_prior_refresh", "source_links": [ { "id": "kwo-trift-access-2026", "url": "https://www.strom.ch/system/files/media/documents/Medienmitteilung%20KWO%2019022026.pdf", "publisher": "Kraftwerke Oberhasli AG", "publication_date": "2026-02-19", "evidence_status": "archived_original_response_and_derived_text" } ] }, { "name": "Chlus", "canton": "GR", "programme": "federal_annex_2_list_in_2025_release", "programme_source": "federal-hydro-pipeline-2025", "latest_project_source_id": "repower-chlus-2026", "project_stage": "concession_granted_project_approval_pending_no_construction_decision", "incremental_natural_generation_gwh_per_year": 217, "additional_winter_energy_gwh": 65, "incremental_reservoir_energy_gwh": null, "incremental_turbine_mw": null, "incremental_pump_mw": null, "commissioning_target": null, "capex_chf_million": null, "unsubsidized_viability_status": "not_demonstrated_operator_funding_conditions_pending", "in_assured_2050_supply": false, "winter_energy_definition": "Winter portion of prospective annual generation; season convention not specified in release", "construction_start_target": 2028, "construction_duration_years": 5, "earliest_arithmetic_completion_year": 2033, "completion_status": "derived from conditional 2028 start plus approximately five years; not assured commissioning", "subsidy_dependency": "Operator requires binding federal investment and hydropeaking-remediation funding commitments before construction decision", "review_classification": "reused_prior_refresh", "source_links": [ { "id": "repower-chlus-2026", "url": "https://www.repower.com/ch/medienmitteilungen/chlus_projektgenehmigung", "publisher": "Repower", "publication_date": "2026-06-15", "evidence_status": "archived_original_response_and_derived_text" } ] }, { "name": "Grimsel 4", "canton": "BE", "programme": "separate_pumped_storage_expansion_not_grimselsee_raising", "latest_project_source_id": "kwo-grimsel4-investment-2026", "project_stage": "construction_started_operator_report", "decision_date": "2026-03-27", "incremental_turbine_mw": 168, "incremental_pump_mw": null, "pump_rating_note": "Two reversible units rated 84 MW each; distinct pumping electrical-input rating not isolated in release, so do not automatically add 168 MW pump demand", "commissioning_target": "2032-02 scheduled works completion", "construction_start_target": "2026-06 was the prior announced target; superseded by actual 2026-07-07 operator report", "capex_chf_million": 300, "incremental_reservoir_energy_gwh": null, "reservoir_note": "Connects existing lakes, no additional impoundment surface; no new seasonal storage credit inferred", "incremental_natural_generation_gwh_per_year": null, "unsubsidized_viability_status": "not_assessed_board_decision_is_not_public_merchant_cashflow_proof", "in_assured_2050_supply": false, "review_classification": "prior_refresh_plus_new_construction_evidence", "construction_start": "2026-07-07", "additional_source_ids": [ "kwo-grimsel-concession-2026" ], "construction_evidence_boundary": "Related KWO post embedded in the archived official KWO LinkedIn article reports actual start on 7 July 2026. Distinct from the prior June target.", "source_links": [ { "id": "kwo-grimsel-concession-2026", "url": "https://de.linkedin.com/pulse/grosser-rat-spricht-konzession-f%C3%BCr-grimselseevergr%C3%B6sserung-p7wse", "publisher": "KWO via official LinkedIn post", "publication_date": "2026-09-09", "evidence_status": "original_response_archived_reviewed" }, { "id": "kwo-grimsel4-investment-2026", "url": "https://www.strom.ch/de/document/20260327kwomedienmitteilungbaugrimsel4", "publisher": "Kraftwerke Oberhasli AG", "publication_date": "2026-03-27", "evidence_status": "reused_original_archive" } ] }, { "name": "Dix+", "canton": "VS", "programme": "separate_grande_dixence_raising", "latest_project_source_id": "alpiq-gornerli-sizing-2026", "project_stage": "technical_feasibility_reported_regulatory_questions_open", "additional_winter_energy_gwh": 100, "winter_energy_definition": "Additional energy-storage potential in Grande Dixence system, not extra annual natural generation", "incremental_reservoir_volume_million_m3": 20, "dam_raising_m": 5, "commissioning_target": null, "capex_chf_million": null, "unsubsidized_viability_status": "not_assessed", "in_assured_2050_supply": false, "review_classification": "reused_prior_refresh", "source_links": [ { "id": "alpiq-gornerli-sizing-2026", "url": "https://www.alpiq.com/newsroom/news-stories/a-major-milestone-has-been-reached-by-gornerli-multi-purpose-reservoir", "publisher": "Alpiq", "publication_date": "2026-05-20", "evidence_status": "reused_original_archive" } ] } ], "aggregate_observations": [ { "source_id": "federal-hydro-pipeline-2025", "source_date": "2025-08-27", "basis": "Q2 2025 operator survey", "target_winter_storage_production_twh_2040": 2.0, "estimated_winter_storage_production_twh_2040": 1.1, "estimated_full_buildout_twh": 1.5, "full_buildout_year": null, "classification": "official forecast, not commitment; full buildout does not mean 2050" }, { "source_id": "federal-hydro-followup-2025", "source_date": "2025-12-04", "estimated_winter_storage_production_twh_2040": 1.1, "classification": "reaffirmed estimate and project-list update process, not a new completed pipeline" } ], "aggregation_rules": [ "Never add programme totals to their constituent projects.", "Do not combine 2025 aggregate forecasts with resized 2026 project figures without reconciling scopes.", "Do not interpret seasonal production in TWh/year as identical to new lake capacity in TWh.", "Do not count all hydro projects as guaranteed by 2050 or as subsidy-free." ], "prior_register": "data/evidence-baseline-2026-09-10/hydro-expansion-register.json" }