JEPX Pulse
Japan Power Market Intelligence
Solar cannibalisation · curtailment (出力制御) · duck curve

Renewables Analytics

Solar capture price
13.74¥/kWh
capture rate 82% of baseload 16.73
Wind capture price
17.07¥/kWh
capture rate 102%
Midday vs evening
11.4 / 28.7¥/kWh
floor hours 1 h · price↔VRE corr -0.33
Curtailed energy
3.4GWh
solar 3.4 · wind 0.1 · ratio 0.10%

Duck curve · Kyushu (九州)

Average 48-slot profile 2026-07-20 → 2026-09-19 (62 days): demand, net demand after VRE, solar, wind, price

  • Area price
  • Demand
  • Net demand (after VRE)
  • Solar
  • Solar curtailed
  • Wind
00:0003:0006:0009:0012:0015:0018:0021:000GW4GW7GW11GW14GW16¥24¥32¥

Daily capture rate & midday depression

Solar-weighted price ÷ time-weighted price · midday (10–14h) ÷ daily average

  • Floor hours
  • Midday/day ratio
  • Solar capture rate
  • Wind capture rate
07-2107-2708-0208-0808-1408-2008-2609-0109-0709-1309-1900.40.81.21.600.250.50.751

Price vs VRE penetration

Average area price by solar+wind share of demand (per slot)

  • Avg price ¥
  • Floor share %
0-10%10-20%20-30%30-40%40-50%50-60%60-80%061218240%0.3%0.6%0.9%1.2%

Daily curtailment & solar output

MWh curtailed (solar/wind) and solar peak MW

  • Midday VRE share %
  • Solar curtailed MWh
  • Solar peak MW
  • Wind curtailed MWh
07-2508-0108-0808-1508-2208-2909-0509-1209-190900180027003600025005000750010000

All areas · 60 days

Composite risk index = 40% floor-price share + 40% curtailment ratio + 20% midday depression

AreaAvg ¥Floor hFloor %Midday/DaySolar capture ¥Solar capture rateWind capture rateCurtail %RE shareRisk idxTSO data
Hokkaido 北海道14.4123.51.6%0.609.1164%96%0.40%50%17→ 09-13
Tohoku 東北17.370.00.0%0.6616.4979%98%0.12%43%12→ 09-18
Tokyo 東京22.000.00.0%0.9721.8799%100%0.00%15%1→ 09-19
Chubu 中部22.250.00.0%0.9220.1891%94%0.00%24%3→ 09-19
Hokuriku 北陸19.970.00.0%0.9619.6398%96%0.00%35%1→ 09-19
Kansai 関西19.290.00.0%0.9519.1399%104%0.00%15%2→ 09-19
Chugoku 中国17.831.00.1%0.7615.2085%95%0.00%26%8→ 09-19
Shikoku 四国16.4120.01.3%0.6512.4276%108%0.00%35%14→ 09-19
Kyushu 九州16.681.00.1%0.6813.7482%102%0.10%32%11→ 09-19
Sources: JEPX spot & intraday CSV · TSO area supply-demand actuals (エリア需給実績, OCCTO format) for 9 areas · Prices in ¥/kWh · Analytics for information only, not investment advice.