Unlimited, Uncompensated Output Curtailment for Solar, Wind and Biomass
First written in FY2017. 16 of 35 entries say "Materialised", first in FY2019-Q3. Latest entry: 2026-09-30.
Renova moved to the "Worse" side of this theme in 2019, the same year as the typical company in this theme.
The whole theme swung hardest in 2025: 5 of 14 companies on the "Worse" side.
3 other companies' latest entry also says "Materialised".
- FY2026Quantification of annual impactAnnual report
「The ratio of total lost generation resulting from output control in March 2026 to the annual planned electricity sales volume of all power plants operated by the company was 0.270%, and the impact on consolidated results was immaterial.」
The impact of output control on annual planned electricity sales was quantified at 0.270%, and the company explained that the impact on consolidated results was immaterial. - FY2026-H1WorsenedAnnual report
「As a result of output curtailment implemented from July 2025 through the end of September 2025, the Group's Karumai Higashi Solar silent partnership business suspended operations for 1 day (totaling 3.5 hours), Karumai Sonbo Solar for 2 days (totaling 9.5 hours), and Hitoyoshi Solar for 3 days (totaling 8.5 hours). United Renewable Energy Co., Ltd. responded to output curtailment for 9 days (totaling 46.0 hours, with output at the transmission end restricted to 75% of rated capacity), Karita Biomass Energy Co., Ltd. for 10 days (totaling 22.0 hours, to 70%), Morinomiyako Biomass Energy GK for 10 days (totaling 47.5 hours, to 80%), Ishinomaki Hibarino Biomass Energy GK for 10 days (totaling 57.6 hours, to 80%), and Tokushima Tsuda Biomass Power Plant GK for 1 day (totaling 1.0 hour, to 85%).」
Regarding output curtailment from July through September 2025, multiple solar and biomass power plants were affected, and the company disclosed the suspension days, hours and curtailment rates for each plant. It considers lost generation to be within the range of its plans. - FY2025WorsenedAnnual report
「As a result of output curtailment implemented during the fiscal year, the Group's Kokonoe Solar silent partnership business suspended operations for 37 days (totaling 207.8 hours), Otsu Solar for 35 days (totaling 191.8 hours), and Hitoyoshi Solar for 113 days (totaling 539.9 hours).」
The scope of output curtailment and the number of suspension days expanded. Hitoyoshi Solar was curtailed for 113 days, totaling 539.9 hours, and Karita Biomass for 134 days, totaling 665.5 hours. However, the company explained that lost generation was within the range of its plans. - FY2025-H1MaterialisedAnnual report
「As a result of output curtailment implemented from July 2024 through the end of September 2024, Karita Biomass Energy Co., Ltd. implemented output curtailment for 7 days (totaling 31.0 hours), with output at the transmission end restricted to 80% of rated capacity. Lost generation by the Group as a result was within the range of the company's plans.」
From July through September 2024, Karita Biomass was subject to output curtailment for 7 days, totaling 31.0 hours, to 80% of rated capacity. The company considers lost generation to be within the range of its plans. - FY2024WorsenedAnnual report
「As a result of output curtailment implemented during the fiscal year, the Group's Kokonoe Solar silent partnership business suspended operations for 43 days (totaling 292.5 hours), Otsu Solar for 41 days (totaling 301.5 hours), Karumai Nishi Solar for 1 day (totaling 6.0 hours), Karumai Higashi Solar for 1 day (totaling 6.0 hours), Karumai Sonbo Solar for 2 days (totaling 8.5 hours), Kikukawa Ishiyama Solar Co., Ltd. for 1 day (totaling 8.0 hours), Kikukawa Horinouchidani Solar Co., Ltd. for 1 day (totaling 8.0 hours), Yokkaichi Solar silent partnership business for 1 day (totaling 8.0 hours), and Hitoyoshi Solar silent partnership business for 85 days (totaling 374.0 hours). United Renewable Energy Co., Ltd. responded to output curtailment for 11 days (totaling 78.0 hours), with output at the transmission end restricted to 75% of rated capacity; Karita Biomass Energy Co., Ltd. responded for 178 days (totaling 1,074.0 hours), Morinomiyako Biomass Energy GK for 3 days (totaling 14.0 hours), and Tokushima Tsuda Biomass Power Plant GK for 9 days (totaling 32.0 hours), with output restricted to 80% of rated capacity.」
The scope of output curtailment expanded, with Karita Biomass curtailed for 178 days, totaling 1,074 hours, and Hitoyoshi Solar for 85 days, totaling 374 hours. The company considers lost generation to be within the range of its plans. - FY2024-Q3WorsenedAnnual report
「As a result of output curtailment implemented from October 2023 through the end of December 2023, the Group's Kokonoe Solar silent partnership business suspended operations for 4 days (totaling 27.0 hours), Otsu Solar for 4 days (totaling 27.5 hours), and Hitoyoshi Solar for 36 days (totaling 159.0 hours). At the biomass power plants, Karita Biomass Energy Co., Ltd. implemented output curtailment for 61 days (totaling 292.0 hours), with output at the transmission end restricted to 80% of rated capacity, and Tokushima Tsuda Biomass Power Plant GK implemented output curtailment for 1 day (totaling 2.0 hours), also to 80% of rated capacity.」
Output curtailment extended to Hitoyoshi Solar and Tokushima Tsuda Biomass, which had begun commercial operations. Karita Biomass was curtailed for 61 days, totaling 292 hours. - FY2024-Q2MaterialisedAnnual report
「As a result of output curtailment implemented from July 2023 through the end of September 2023, the Group's Hitoyoshi Solar silent partnership business suspended operations for 1 day (totaling 5.5 hours). At the biomass power plants, Karita Biomass Energy Co., Ltd. implemented output curtailment for 19 days (totaling 97.5 hours), with output at the transmission end restricted to 80% of rated capacity. Lost generation by the Group as a result was within the range of the company's plans.」
From July through September 2023, Hitoyoshi Solar suspended operations for 1 day, while Karita Biomass responded to output curtailment for 19 days, totaling 97.5 hours, to 80% of rated capacity. The company explained that lost generation was within the range of its plans. - FY2024-Q1WorsenedAnnual report
「As a result of output curtailment implemented from April 2023 through the end of June 2023, the Group's Kokonoe Solar silent partnership business suspended operations for 34 days (totaling 248 hours), Otsu Solar for 34 days (totaling 258.5 hours), Karumai Nishi Solar for 1 day (totaling 9.5 hours), Karumai Higashi Solar for 1 day (totaling 10.0 hours), Karumai Sonbo Solar for 1 day (totaling 8.5 hours), Kikukawa Ishiyama Solar Co., Ltd. for 1 day (totaling 8.0 hours), Kikukawa Horinouchidani Solar Co., Ltd. for 1 day (totaling 8.0 hours), and Hitoyoshi Solar silent partnership business for 8 days (totaling 45.0 hours). At the biomass power plants, United Renewable Energy Co., Ltd. implemented output curtailment for 8 days (totaling 64.0 hours), with output at the transmission end restricted to 75% of rated capacity, and Karita Biomass Energy Co., Ltd. implemented output curtailment for 50 days (totaling 415.5 hours), to 80% of rated capacity. Lost generation by the Group as a result was within the range of the company's plans.」
From April through June 2023, output curtailment was implemented at multiple solar and biomass power plants. In particular, Karita Biomass was curtailed for 50 days, totaling 415.5 hours, and URE for 8 days, totaling 64 hours, but the company explained that lost generation was within the range of its plans. - FY2023WorsenedAnnual report
「As a result of output control implemented during the fiscal year, the Group's Kokonoe Solar silent partnership business suspended operations for 28 days (totaling 128 hours) and its Otsu Solar silent partnership business for 28 days (totaling 125 hours). United Renewable Energy Co., Ltd. responded to output curtailment for 8 days (totaling 64.0 hours), and Karita Biomass Energy Co., Ltd. for 122 days (totaling 574 hours), with output at the transmission end restricted to 80% of rated capacity. Lost generation by the Group as a result was within the range of the company's plans.」
Output curtailment extended beyond solar power to biomass. Karita Biomass responded to curtailment to 80% of rated capacity for 122 days, totaling 574 hours. - FY2023-Q3WorsenedAnnual report
「From October 2022 through the end of December 2022, output curtailment was implemented. Karita Biomass Energy Co., Ltd. implemented output curtailment for 39 days (totaling 121 hours), with lost generation by the Group as a result within the range of the company's plans. No output curtailment or output control was implemented at the other biomass or solar power plants.」
Karita Biomass was subject to output curtailment for 39 days, totaling 121 hours, up from 7 days and 28.5 hours reported for the previous quarter. Meanwhile, the company considers lost generation to be within the range of its plans. - FY2023-Q2MaterialisedAnnual report
「From July 2022 through the end of September 2022, renewable energy output control and output curtailment were implemented. At the solar power plants, the Group's Kokonoe Solar silent partnership business and Otsu Solar silent partnership business each suspended operations for 1 day (totaling 4.5 hours). At the biomass power plants, Karita Biomass Energy Co., Ltd. implemented output curtailment for 7 days (totaling 28.5 hours), with output at the transmission end restricted to 80% of rated capacity. Lost generation by the Group as a result was within the range of the company's plans.」
From July through September 2022, Kokonoe Solar and Otsu Solar each suspended operations for 1 day, while Karita Biomass responded to output curtailment for 7 days, totaling 28.5 hours, to 80% of rated capacity. The company explained that lost generation was within the range of its plans. - FY2023-Q1MaterialisedAnnual report
「During the first quarter of the fiscal year, renewable energy output control and output curtailment were implemented. At the solar power plants, the Group's Kokonoe Solar silent partnership business suspended operations for 5 days (totaling 9.5 hours), Otsu Solar for 5 days (totaling 11.0 hours), Karumai Nishi Solar for 2 days (totaling 8.5 hours), Karumai Higashi Solar for 2 days (totaling 9.0 hours), and Karumai Sonbo Solar for 1 day (totaling 5.5 hours). At the biomass power plants, United Renewable Energy Co., Ltd. implemented output curtailment for 4 days (totaling 32 hours), with output at the transmission end restricted to 80% of rated capacity, and Karita Biomass Energy Co., Ltd. implemented output curtailment for 28 days (totaling 143.5 hours), also to 80% of rated capacity. Lost generation by the Group as a result was within the range of the company's plans.」
Output curtailment was implemented at multiple solar power plants as well as URE and Karita Biomass. Karita Biomass was curtailed for 28 days, totaling 143.5 hours, to 80% of rated capacity, but the company explained that lost generation was within the range of its plans. - FY2022WorsenedAnnual report
「During the fiscal year, output control (output curtailment) was implemented. As a result, the Group's Kokonoe Solar silent partnership business and Otsu Solar silent partnership business each suspended operations for 23 days, totaling 61.5 hours and 67 hours, respectively. Karita Biomass Energy Co., Ltd. responded to output curtailment for 68 days (totaling 292.5 hours), with output at the transmission end restricted to 80% of rated capacity. Lost generation by the Group as a result was within the range assumed in the company's plans.」
Output curtailment extended beyond solar power to Karita Biomass, which responded to curtailment to 80% of rated capacity for 68 days, totaling 292.5 hours. - FY2022-Q3WorsenedAnnual report
「From October 2021 through the end of December 2021, output control (output curtailment) was implemented in Kyushu Electric Power's service area. As a result, the Group's Kokonoe Solar silent partnership business and Otsu Solar silent partnership business each suspended operations for 9 days (totaling 18 hours). Karita Biomass Energy Co., Ltd. responded to output curtailment for 37 days (totaling 139 hours), with output at the transmission end restricted to 80% of rated capacity. Lost generation by the Group as a result was within the range assumed in the company's plans.」
Output curtailment extended beyond solar power to Karita Biomass, which responded to curtailment to 80% of rated capacity for 37 days, totaling 139 hours. The company considers lost generation to be within the range assumed in its plans. - FY2022-Q2MaterialisedAnnual report
「From July 2021 through the end of September 2021, output control (output curtailment) was implemented in Kyushu Electric Power's service area. As a result, the Group's Kokonoe Solar silent partnership business suspended operations for 2 days (totaling 6.5 hours), its Otsu Solar silent partnership business for 3 days (totaling 7.5 hours), and Karita Biomass Energy Co., Ltd. for 8 days (totaling 42.5 hours). Lost generation by the Group as a result was within the range assumed in the company's plans.」
Output curtailment was implemented from July through September 2021, and Kokonoe Solar, Otsu Solar and Karita Biomass each suspended operations. The company considers lost generation to be within the range assumed in its plans. - FY2022-Q1MaterialisedAnnual report
「From April 2021 through the end of June 2021, renewable energy output was curtailed for a total of 10 days in Kyushu Electric Power's service area (total for Kyushu Island). As a result, the Group's Kokonoe Solar silent partnership business suspended operations for 5 days (totaling 19 hours) and its Otsu Solar silent partnership business for 5 days (totaling 20 hours). Lost generation by the Group as a result was within the range assumed in the company's plans.」
Output curtailment was implemented for a total of 10 days from April through June 2021, and Kokonoe Solar and Otsu Solar each suspended operations for 5 days. The company considers lost generation to be within the range assumed in its plans. - FY2021MaterialisedAnnual report
「During the fiscal year, renewable energy output was curtailed for a total of 14 days (total for Kyushu Island), but lost generation by the Group as a result was within the range assumed in the company's planned volume.」
Output curtailment was implemented for a total of 14 days during the year. The company considers lost generation to be within the range assumed in its plans. - FY2021-Q3MaterialisedAnnual report
「From October 2020 through December 2020, renewable energy output was curtailed for a total of 2 days in Kyushu Electric Power's service area (total for Kyushu Island). As a result, the Group's Kokonoe Solar silent partnership business and Otsu Solar silent partnership business each suspended operations for 1 day, in both cases from 8:00 a.m. to 4:00 p.m. Lost generation by the Group as a result was within the range assumed in the company's planned volume.」
Output curtailment in Kyushu Electric Power's service area totaled 2 days from October through December 2020, and Kokonoe Solar and Otsu Solar each suspended operations for 1 day. The company considers lost generation to be within the range assumed in its plans. - FY2021-Q2No output curtailment orders were issued during the quarter.Annual report
「No renewable energy output control (output curtailment) orders were issued from July 2020 through September 2020.」
The company stated that no renewable energy output curtailment orders were issued from July through September 2020. - FY2021-Q1MaterialisedAnnual report
「From April 2020 through June 2020, renewable energy output was curtailed for a total of 8 days in Kyushu Electric Power's service area (total for Kyushu Island). As a result, the Group's Kokonoe Solar silent partnership business and Otsu Solar silent partnership business each suspended operations for 4 days, in both cases from 8:00 a.m. to 4:00 p.m. Lost generation by the Group as a result was within the range assumed in the company's plans.」
Output curtailment in Kyushu Electric Power's service area totaled 8 days from April through June 2020, and Kokonoe Solar and Otsu Solar each suspended operations for 4 days. The company considers lost generation to be within the range assumed in its plans. - FY2020-Q3WorsenedAnnual report
「From April 2019 through December 2019, renewable energy output was curtailed for a total of 43 days in Kyushu Electric Power's service area (total for Kyushu Island). As a result, the Group's Kokonoe Solar silent partnership business and Otsu Solar silent partnership business each suspended operations for 10 days, in both cases from 8:00 a.m. to 4:00 p.m.」
Output curtailment in Kyushu Electric Power's service area increased from the previously reported total of 30 days to 43 days, and the suspension period for both Kokonoe Solar and Otsu Solar was 10 days. - FY2020-Q2RestatedAnnual report
「From April 2019 through September 2019, renewable energy output was curtailed for a total of 30 days in Kyushu Electric Power's service area (total for Kyushu Island).」
From April through September 2019, output curtailment in Kyushu Electric Power's service area totaled 30 days, the same as previously reported. - FY2020-Q1WorsenedAnnual report
「From April 2019 through June 2019, renewable energy output was curtailed for a total of 30 days in Kyushu Electric Power's service area (total for Kyushu Island). As a result, the Group's Kokonoe Solar silent partnership business suspended operations for 9 days and its Otsu Solar silent partnership business for 8 days, in both cases from 8:00 a.m. to 4:00 p.m. Lost generation by the Group as a result represented 0.68% of the annual planned electricity sales volume of all solar power plants operated by the company.」
Output curtailment in Kyushu Electric Power's service area increased from a total of 26 days in the fiscal year ended March 2019 to 30 days in the current quarter. The company reported the number of suspension days at the affected power plants and lost generation of 0.68%. However, it explained that the impact was within the range assumed in its plans. - FY2019WorsenedAnnual report
「In the fiscal year ended March 2019, renewable energy output was curtailed for a total of 26 days in Kyushu Electric Power's service area (total for Kyushu Island). As a result, the Group's Kokonoe Solar silent partnership business suspended operations for 5 days and its Otsu Solar silent partnership business for 6 days, in both cases from 9:00 a.m. to 4:00 p.m.」
Output curtailment in Kyushu Electric Power's service area totaled 26 days, up from the 10 days previously reported. Kokonoe Solar was suspended for 5 days and Otsu Solar for 6 days, and the company explained that lost generation represented 0.45% of the annual planned electricity sales volume. - FY2019-Q4MaterialisedAnnual report
「From October 2018 through February 2019, renewable energy output control, or output curtailment, was implemented for a total of 10 days in the Kyushu Electric Power service area, covering the whole of Kyushu Island. As a result, the Kuju Solar Anonymous Partnership and the Ozu Solar Anonymous Partnership businesses of our group each suspended operations for 2 days, from 9:00 a.m. to 4:00 p.m.」
Curtailment in Kyushu Electric Power's service area increased from the previously reported total of 8 days to 10 days, with Kokonoe Solar and Otsu Solar each suspended for 2 days. Lost generation represented 0.16% of the annual planned electricity sales volume, and the company explained that the impact was immaterial. - FY2019-Q3MaterialisedAnnual report
「In October and November 2018, renewable energy output control, or output curtailment, was implemented for a total of 8 days in the service area of Kyushu Electric Power. As a result, the Kuju Solar Anonymous Partnership and the Ozu Solar Anonymous Partnership businesses of our group each suspended operations for 2 days, from 9:00 a.m. to 4:00 p.m.」
Output curtailment was actually implemented in the Kyushu Electric Power service area, and Kuju Solar and Ozu Solar each suspended operations for 2 days. The lost generation volume was 0.16% of the planned annual electricity sales volume, and the impact was described as immaterial. - FY2018RestatedAnnual report
「Power generation facilities that apply for grid connection agreements after the new rules take effect may face a reduction in electricity sales revenue due to unlimited, uncompensated output curtailment.」
The company reiterates the risk of unlimited, uncompensated output curtailment for solar, wind and biomass power generation. - FY2017First statedAnnual report
「Power generation facilities that apply for grid connection agreements after the new rules take effect may face a reduction in electricity sales revenue due to unlimited, uncompensated output curtailment.」
The company discloses the risk of lower electricity sales revenue, alongside a policy of using simulation analysis to forecast output curtailment and determine whether projects can be commercialised.