Updated daily · 2026-10-31
Projects

Japan grid-scale BESS projects available through ScienceX

High-voltage (~2 MW) and extra-high-voltage battery storage projects, from development rights with grid connection answers to grid-connected assets. Area, prefecture, voltage, size, status and expected COD are shown below. Prices, exact sites and counterparties are not published here.

179Listed projects
1,510 MWTotal output
152High voltage (~2 MW class)
24Extra-high voltage
37Prefectures
Listed projects

Project list (179 projects · updated 2026-10-31)

Sorted by earliest expected COD (commercial operation date). Use the filters to narrow the list.

179 of 179 projects
IDAreaPrefectureVoltageMWMWhStatusStructureExpected COD
HV-279KyushuKumamotoHigh voltage28Grid-connectedCompleted-build handoverGrid-connected
HV-278ChubuNaganoHigh voltage28Grid-connectedCompleted-build handoverGrid-connected
HV-356ChubuGifuHigh voltage28.3Grid cost confirmedCompleted-build handoverOct 2026
HV-355ChubuGifuHigh voltage28.3Grid cost confirmedCompleted-build handoverOct 2026
HV-176ChugokuShimaneHigh voltage28.2Grid cost confirmedCompleted-build handoverOct 2026
HV-173KansaiShigaHigh voltage28.3Grid cost confirmedCompleted-build handoverNov 2026
HV-282KyushuOitaHigh voltage28.1Grid connection study answeredCompleted-build handoverDec 2026
HV-267ChubuMieHigh voltage1.998.1Grid connection study answeredCompleted-build handoverDec 2026
HV-391NewTokyoTochigiHigh voltage28Grid connection study answeredTransfer of rightsJan 2027 (about 3 months of grid work)
HV-390NewTokyoTochigiHigh voltage28Grid connection study answeredTransfer of rightsJan 2027 (about 3 months of grid work)
HV-341KansaiWakayamaHigh voltage1.938.2Grid cost confirmedCompleted-build handoverJan 2027
HV-408NewKyushuKumamotoHigh voltage28Grid connection study answeredCompleted-build handoverFeb 2027
HV-319KyushuKumamotoHigh voltage27.5Grid connection study answeredCompleted-build handoverFeb 2027
HV-316ChugokuTottoriHigh voltage210Grid connection study answeredCompleted-build handoverFeb 2027
HV-283KyushuOitaHigh voltage28.1Grid cost confirmedCompleted-build handoverFeb 2027
HV-447NewTohokuNiigataHigh voltage28Grid connection study answeredCompleted-build handoverMar 2027
HV-409NewTokyoTochigiHigh voltage28Grid cost confirmedCompleted-build handoverMar 2027 (about 3 months of grid work)
HV-403NewChubuGifuHigh voltage28.2Grid connection study answeredCompleted-build handoverMar 2027
HV-433NewKyushuSagaHigh voltage——Grid connection study answeredCompleted-build handoverApr 2027
HV-354TokyoSaitamaHigh voltage28Grid connection study answeredCompleted-build handoverApr 2027 (about 3 months of grid work)
HV-289TokyoKanagawaHigh voltage28.1Grid cost confirmedCompleted-build handoverApr 2027 (about 5 months after grid cost payment)
HV-200KyushuKumamotoHigh voltage28.3Grid cost confirmedCompleted-build handoverApr 2027
HV-199KyushuKumamotoHigh voltage28.3Grid cost confirmedCompleted-build handoverApr 2027
HV-462NewChubuAichiHigh voltage28Grid connection study answeredCompleted-build handoverMay 2027
HV-402NewTokyoIbarakiHigh voltage28.2Grid connection study answeredCompleted-build handoverMay 2027
HV-401NewKyushuMiyazakiHigh voltage1.968.1Grid cost confirmedTransfer of rightsMay 2027
HV-388NewTohokuFukushimaHigh voltage28.4Grid connection study answeredCompleted-build handoverMay 2027
HV-386ChugokuHiroshimaHigh voltage28Grid connection study answeredCompleted-build handoverMay 2027
HV-381TokyoIbarakiHigh voltage1.978.4Grid connection study answeredTransfer of rightsMay 2027 (about 4 months of grid work)
HV-328ChubuMieHigh voltage28.4Grid cost confirmedCompleted-build handoverMay 2027
HV-277TokyoSaitamaHigh voltage2—Grid connection study answeredCompleted-build handoverJun 2027 (about 8 months after grid cost payment)
HV-276TokyoSaitamaHigh voltage2—Grid connection study answeredCompleted-build handoverJun 2027 (about 4 months after grid cost payment)
HV-121TokyoSaitamaHigh voltage25Grid connection study answeredCompleted-build handoverJun 2027
HV-432NewKyushuSagaHigh voltage——Grid connection study answeredCompleted-build handoverJul 2027
HV-400NewKansaiShigaHigh voltage28Grid connection study answeredTransfer of rightsJul 2027 (about 8 months of grid work)
HV-394NewChubuGifuHigh voltage28Grid connection study answeredTransfer of rightsJul 2027 (about 7 months of grid work)
HV-383TokyoKanagawaHigh voltage1.978.4Grid cost confirmedTransfer of rightsJul 2027 (about 6 months after grid cost payment)
HV-318ChugokuHiroshimaHigh voltage28Grid cost confirmedCompleted-build handoverJul 2027
HV-264ChubuShizuokaHigh voltage28Grid connection study answeredTransfer of rightsJul 2027
HV-448NewChubuShizuokaHigh voltage28Grid connection study answeredCompleted-build handoverAug 2027
HV-413NewKyushuKumamotoHigh voltage——Grid cost confirmedCompleted-build handoverAug 2027
HV-361TokyoTokyoHigh voltage28.1Grid connection study answeredCompleted-build handoverAug 2027 (about 6 months of grid work)
HV-261ChubuMieHigh voltage1.978.1Grid connection study answeredCompleted-build handoverAug 2027
HV-461NewChubuAichiHigh voltage28Grid connection study answeredCompleted-build handoverSep 2027
HV-460NewTokyoTochigiHigh voltage28.3Grid connection study answeredCompleted-build handoverSep 2027 (about 3 months of grid work)
HV-434NewTokyoTokyoHigh voltage——Grid connection study answeredCompleted-build handoverSep 2027
HV-411NewTokyoChibaHigh voltage28Grid connection study answeredUnder reviewSep 2027
HV-404NewChugokuOkayamaHigh voltage28.2Grid connection study answeredCompleted-build handoverSep 2027
HV-387NewTohokuNiigataHigh voltage28Grid connection study answeredCompleted-build handoverSep 2027 (about 6 months of grid work)
HV-365ChubuGifuHigh voltage1.998.4Grid connection study answeredCompleted-build handoverSep 2027 (about 10 months of grid work)
HV-337KansaiWakayamaHigh voltage26.8Grid connection study answeredCompleted-build handoverSep 2027 (about 6 months after grid cost payment)
HV-336ChugokuHiroshimaHigh voltage28Grid cost confirmedTransfer of rightsSep 2027
HV-321KyushuKumamotoHigh voltage28.3Grid connection study answeredCompleted-build handoverSep 2027
HV-414NewTokyoSaitamaHigh voltage1.998.4Grid connection study answeredCompleted-build handoverNov 2027
HV-392NewTokyoGunmaHigh voltage28Grid cost confirmedTransfer of rightsNov 2027 (about 7 months of grid work)
HV-349TokyoGunmaHigh voltage28Grid cost confirmedCompleted-build handoverNov 2027 (about 7 months after grid cost payment)
SHV-118TokyoTochigiExtra-high voltage50—Grid connection study answeredTransfer of rightsNov 2027
HV-449NewTokyoSaitamaHigh voltage28Grid connection study answeredCompleted-build handoverDec 2027
HV-377ChubuMieHigh voltage27.6Grid cost confirmedCompleted-build handoverDec 2027
HV-363TokyoTokyoHigh voltage28.1Grid cost confirmedCompleted-build handoverDec 2027 (about 4 months of grid work)
HV-260ChubuAichiHigh voltage28.1Grid connection study answeredCompleted-build handoverDec 2027
HV-243KansaiWakayamaHigh voltage28Grid connection study answeredCompleted-build handoverDec 2027
HV-226KansaiFukuiHigh voltage28Grid connection study answeredCompleted-build handoverJan 2028 (about 15 months of grid work)
HV-101TokyoTochigiHigh voltage2—Grid connection study answeredTransfer of rightsJan 2028 (about 11 months after grid cost payment)
HV-415NewChubuShizuokaHigh voltage1.998.4Grid connection study answeredCompleted-build handoverFeb 2028
HV-229KyushuKumamotoHigh voltage28Grid connection study answeredCompleted-build handoverMar 2028 (about 17 months of grid work)
SHV-116KyushuMiyazakiExtra-high voltage50—Grid cost confirmedTransfer of rightsMar 2028
HV-373KansaiNaraHigh voltage28.1Grid cost confirmedTransfer of rightsApr 2028 (about 12 months after grid cost payment)
HV-371TokyoShizuokaHigh voltage28.1Grid cost confirmedCompleted-build handoverApr 2028
HV-364ChubuGifuHigh voltage1.998.4Grid connection study answeredTransfer of rightsApr 2028 (about 18 months of grid work)
HV-222KyushuKagoshimaHigh voltage28Grid connection study answeredCompleted-build handoverApr 2028 (about 18 months of grid work)
SHV-117ChubuShizuokaExtra-high voltage35210Grid connection study answeredTransfer of rightsApr 2028
SHV-92NewKyushuFukuokaExtra-high voltage47188Grid cost confirmedTransfer of rightsApr 2028
HV-446NewTohokuIwateHigh voltage28Grid connection study answeredCompleted-build handoverMay 2028
HV-372KansaiWakayamaHigh voltage28Grid cost confirmedTransfer of rightsMay 2028 (about 12 months of grid work)
HV-451NewTokyoChibaHigh voltage28Grid connection study answeredCompleted-build handoverJun 2028
HV-450NewTokyoIbarakiHigh voltage28Grid connection study answeredCompleted-build handoverJun 2028
HV-326KyushuKumamotoHigh voltage28.4Grid cost confirmedCompleted-build handoverJul 2028
UR-1KansaiShigaHigh voltage28Grid cost confirmedCompleted-build handoverJul 2028
HV-228KyushuKumamotoHigh voltage28Grid connection study answeredCompleted-build handoverAug 2028 (about 22 months of grid work)
HV-382TokyoKanagawaHigh voltage1.978.4Grid cost confirmedTransfer of rightsDec 2028
HV-454NewTokyoSaitamaHigh voltage28Grid connection study answeredCompleted-build handoverMar 2029
HV-453NewTokyoSaitamaHigh voltage28Grid connection study answeredCompleted-build handoverMar 2029
HV-452NewTokyoSaitamaHigh voltage28Grid connection study answeredCompleted-build handoverMar 2029
SHV-367ChubuShizuokaExtra-high voltage49.8199.2Grid connection study answeredTransfer of rightsMar 2029 (about 23 months of grid work)
SHV-346KansaiWakayamaExtra-high voltage99.38—Grid cost confirmedTransfer of rightsMar 2029 (about 24 months of grid work)
SHV-113TokyoChibaExtra-high voltage50200Grid connection study answeredTransfer of rightsMay 2029
SHV-329KyushuFukuokaExtra-high voltage47.75—Grid cost confirmedTransfer of rightsAug 2029
HV-231KyushuKagoshimaHigh voltage28Grid connection study answeredCompleted-build handoverAug 2029 (about 34 months of grid work)
SHV-93NewChubuAichiExtra-high voltage47—Grid cost confirmedTransfer of rightsSep 2029
HV-227KansaiShigaHigh voltage28Grid connection study answeredCompleted-build handoverOct 2029 (about 36 months of grid work)
HV-225KansaiFukuiHigh voltage28Grid connection study answeredCompleted-build handoverOct 2029 (about 36 months of grid work)
HV-232ChubuShizuokaHigh voltage28Grid connection study answeredCompleted-build handoverNov 2029
SHV-366TokyoIbarakiExtra-high voltage50.82203.3Grid connection study answeredTransfer of rightsDec 2029
SHV-333NewKyushuNagasakiExtra-high voltage49.9216Grid cost confirmedTransfer of rightsJun 2030 (about 43 months of grid work)
HV-201TokyoGunmaHigh voltage28.1Grid cost confirmedTransfer of rightsNov 2031
SHV-352TohokuMiyagiExtra-high voltage100353.4Grid connection study answeredTransfer of rightsDec 2031
HV-353TokyoChibaHigh voltage1.87.2Grid cost confirmedCompleted-build handoverabout 3 months after grid cost payment
HV-210ShikokuEhimeHigh voltage28Grid connection study answeredCompleted-build handoverabout 3 months of grid work
HV-108ChubuGifuHigh voltage2—Grid cost confirmedCompleted-build handoverabout 3 months after grid cost payment
HV-335ChubuGifuHigh voltage27.5Grid connection study answeredCompleted-build handoverabout 4 months of grid work
HV-412NewTokyoKanagawaHigh voltage28.4Grid connection study answeredCompleted-build handoverabout 5 months of grid work
HV-249HokkaidoHokkaidoHigh voltage28Grid connection study answeredCompleted-build handoverabout 5 months of grid work
HV-410NewKyushuOitaHigh voltage28Grid connection study answeredUnder reviewabout 6 months of grid work
HV-393NewTokyoSaitamaHigh voltage28Grid connection study answeredTransfer of rightsabout 6 months of grid work
HV-248HokkaidoHokkaidoHigh voltage28.1Grid connection study answeredCompleted-build handoverabout 6 months of grid work
HV-107ChubuShizuokaHigh voltage2—Grid cost confirmedCompleted-build handoverabout 6 months after grid cost payment
HV-441NewKyushuKumamotoHigh voltage28.1Grid connection study answeredCompleted-build handoverabout 7 months of grid work
HV-407NewTokyoGunmaHigh voltage28.4Grid cost confirmedCompleted-build handoverabout 7 months of grid work
HV-406NewTokyoGunmaHigh voltage28.4Grid cost confirmedCompleted-build handoverabout 7 months of grid work
HV-253ChubuMieHigh voltage2—Grid connection study answeredCompleted-build handoverabout 8 months of grid work
HV-370KansaiNaraHigh voltage1.998.6Grid connection study answeredCompleted-build handoverabout 9 months of grid work
HV-273KyushuKumamotoHigh voltage28.3Grid cost confirmedCompleted-build handoverabout 10 months of grid work
HV-211ChubuGifuHigh voltage28Grid connection study answeredCompleted-build handoverabout 10 months of grid work
HV-458NewTokyoTochigiHigh voltage28.4Grid connection study answeredUnder reviewabout 11 months of grid work
HV-455NewTokyoSaitamaHigh voltage28.4Grid connection study answeredUnder reviewabout 11 months of grid work
HV-405NewKyushuKumamotoHigh voltage1.998Grid connection study answeredTransfer of rightsabout 11 months of grid work
HV-399NewChubuMieHigh voltage28Grid connection study answeredTransfer of rightsabout 12 months of grid work
HV-344KansaiHyogoHigh voltage27.4Grid connection study answeredTransfer of rightsabout 12 months after grid cost payment
HV-288TokyoGunmaHigh voltage27.4Grid cost confirmedCompleted-build handoverabout 12 months of grid work
HV-268ChubuAichiHigh voltage1.978Grid cost confirmedCompleted-build handoverabout 12 months after grid cost payment
HV-213TokyoSaitamaHigh voltage28Grid connection study answeredCompleted-build handoverabout 12 months of grid work
HV-202TokyoGunmaHigh voltage1.938.4Grid cost confirmedCompleted-build handoverabout 12 months after grid cost payment
HV-313TokyoTochigiHigh voltage28.2Grid cost confirmedCompleted-build handoverabout 14 months of grid work
HV-197KyushuKumamotoHigh voltage28.6Grid cost confirmedCompleted-build handoverabout 14 months after grid cost payment
HV-378TokyoShizuokaHigh voltage2—Grid connection study answeredUnder reviewabout 15 months of grid work
HV-237ChubuAichiHigh voltage28.4Grid connection study answeredCompleted-build handoverabout 15 months of grid work
HV-175HokurikuIshikawaHigh voltage28.1Grid cost confirmedCompleted-build handoverabout 15 months of grid work
UR-3KyushuOitaHigh voltage28Grid cost confirmedCompleted-build handoverabout 15 months of grid work
HV-360KyushuKumamotoHigh voltage28Grid cost confirmedTransfer of rightsabout 17 months after grid cost payment
HV-459NewTokyoSaitamaHigh voltage28.4Grid connection study answeredUnder reviewabout 18 months of grid work
HV-457NewKyushuKumamotoHigh voltage28.4Grid connection study answeredUnder reviewabout 18 months of grid work
SHV-443NewTokyoIbarakiExtra-high voltage1046Grid connection study answeredTransfer of rightsabout 18 months of grid work
HV-369HokurikuFukuiHigh voltage28.1Grid cost confirmedTransfer of rightsabout 18 months after grid cost payment
HV-358KyushuKagoshimaHigh voltage28Grid cost confirmedTransfer of rightsabout 18 months after grid cost payment
HV-271TokyoIbarakiHigh voltage1.998Grid cost confirmedTransfer of rightsabout 18 months after grid cost payment
HV-234ChubuNaganoHigh voltage28.3Grid connection study answeredCompleted-build handoverabout 18 months of grid work
HV-236ChubuGifuHigh voltage28Grid connection study answeredCompleted-build handoverabout 20 months of grid work
HV-359KyushuKumamotoHigh voltage28Grid cost confirmedTransfer of rightsabout 22 months after grid cost payment
HV-235ChubuGifuHigh voltage28Grid connection study answeredCompleted-build handoverabout 22 months of grid work
HV-245ChubuShizuokaHigh voltage28Grid connection study answeredTransfer of rightsabout 23 months of grid work
SHV-114KyushuMiyazakiExtra-high voltage30120Grid connection study answeredTransfer of rightsabout 23 months after grid cost payment
UR-2TohokuNiigataHigh voltage28Grid cost confirmedCompleted-build handoverabout 23 months of grid work
HV-442NewChubuNaganoHigh voltage28Grid connection study answeredTransfer of rightsabout 24 months of grid work
HV-244ChubuShizuokaHigh voltage28Grid connection study answeredTransfer of rightsabout 25 months of grid work
SHV-438NewHokkaidoHokkaidoExtra-high voltage30120Grid cost confirmedTransfer of rightsabout 30 months of grid work
HV-456NewKyushuKagoshimaHigh voltage28.4Grid connection study answeredUnder reviewabout 35 months of grid work
SHV-287ChugokuYamaguchiExtra-high voltage87.36342.1Grid cost confirmedTransfer of rightsabout 35 months after grid cost payment
SHV-347ChugokuHiroshimaExtra-high voltage79.04309.5Grid cost confirmedTransfer of rightsabout 38 months after grid cost payment
HV-385KansaiHyogoHigh voltage28Grid connection study answeredTransfer of rightsabout 40 months after grid cost payment
SHV-105ChubuShizuokaExtra-high voltage150—Grid connection study answeredTransfer of rightsabout 40 months of grid work
SHV-389NewChubuShizuokaExtra-high voltage49.9200.6Grid cost confirmedTransfer of rightsabout 41 months of grid work
SHV-440NewTohokuNiigataExtra-high voltage1040Grid cost confirmedTransfer of rightsabout 42 months of grid work
SHV-439NewTohokuFukushimaExtra-high voltage1560Grid cost confirmedTransfer of rightsabout 48 months of grid work
SHV-379TohokuFukushimaExtra-high voltage38.48—Grid connection study answeredUnder reviewabout 81 months of grid work
HV-445NewKyushuFukuokaHigh voltage1.997.9Grid connection study answeredTransfer of rightsUnder review
HV-444NewKyushuFukuokaHigh voltage1.998Grid connection study answeredTransfer of rightsUnder review
HV-436NewTokyoKanagawaHigh voltage28Grid connection study answeredCompleted-build handoverUnder review
HV-417NewTokyoChibaHigh voltage28.2Grid connection study answeredCompleted-build handoverUnder review
HV-398NewChugokuOkayamaHigh voltage28.1Grid connection study answeredCompleted-build handoverUnder review
HV-397NewChugokuOkayamaLow voltage——Grid connection study answeredTransfer of rightsUnder review
HV-396NewChugokuOkayamaLow voltage——Grid connection study answeredTransfer of rightsUnder review
HV-395NewChugokuOkayamaLow voltage——Grid connection study answeredTransfer of rightsUnder review
HV-324ChugokuOkayamaHigh voltage28.4Grid cost confirmedCompleted-build handoverUnder review
HV-315ChugokuTottoriHigh voltage——Grid connection study answeredCompleted-build handoverUnder review
HV-314KansaiWakayamaHigh voltage210Grid connection study answeredCompleted-build handoverUnder review
HV-312KyushuKagoshimaHigh voltage28Grid connection study answeredCompleted-build handoverUnder review
HV-290ChugokuYamaguchiHigh voltage28.1Grid connection study answeredCompleted-build handoverUnder review
SHV-250KyushuSagaExtra-high voltage30107.3Grid connection study answeredCompleted-build handoverUnder review
HV-214TohokuYamagataHigh voltage28Grid connection study answeredCompleted-build handoverUnder review
HV-209TokyoSaitamaHigh voltage28Grid cost confirmedCompleted-build handoverUnder review
HV-208ChubuMieHigh voltage28Grid connection study answeredCompleted-build handoverUnder review
HV-207ChubuAichiHigh voltage28Grid connection study answeredCompleted-build handoverUnder review
HV-204ChubuMieHigh voltage28Grid connection study answeredCompleted-build handoverUnder review
HV-203KansaiShigaHigh voltage28Grid connection study answeredCompleted-build handoverUnder review
HV-179TohokuYamagataHigh voltage28.2Grid cost confirmedCompleted-build handoverUnder review
HV-126TokyoTochigiHigh voltage25Grid connection study answeredCompleted-build handoverUnder review
HV-125TokyoTochigiHigh voltage25Grid connection study answeredCompleted-build handoverUnder review
SHV-124KansaiWakayamaExtra-high voltage1040Grid connection study answeredCompleted-build handoverUnder review

No listed project matches these filters.

Area = the grid area of the transmission and distribution operator (Tokyo, Chubu, Kyushu and so on). Status: “Grid connection study answered” means the utility has issued its answer on the connection study; “Grid cost confirmed” means the grid construction cost has been fixed; “Grid-connected” means the project is already connected. Structure: “Completed-build handover” or “Transfer of rights” (the buyer builds). Expected COD is an estimate taken from the utility’s answer and may change. These are ScienceX’s own listings, not statistics for the whole Japanese market.

DealRoom

Detailed materials are in DealRoom, after an NDA

This list is an anonymous teaser. Site details, technical documents, grid-utility correspondence and the Q&A for each project are shown in DealRoom, our members-only data room.

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