著者

松尾 雄司 遠藤 聖也 永富 悠 柴田 善朗 小宮山 涼一 藤井 康正

出版者

一般社団法人 エネルギー・資源学会

雑誌

エネルギー・資源学会論文誌 (ISSN:24330531)

巻号頁・発行日

vol.40, no.3, pp.49-58, 2019 (Released:2019-05-10)

参考文献数

29

被引用文献数

2

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In this paper, we used an optimal power generation mix (OPGM) model, as well as meteorological data from 2000 to 2017, to assess the cost of achieving 100% renewable electricity mix in 2050 in Japan. Although the potentials of variable renewable energies, such as wind and solar PV, have been estimated to be large in Japan, grid-related system costs become significant in the cases with very high shares of variable renewables. Particularly, two factors affect the overall costs: The cumulative installed capacity of offshore-wind power, and the required capacity of electricity storage systems. The former is dependent on the curtailment ratio of onshore-wind and solar PV, whereas the latter is determined by the short-time “windless and sunless” factor, i.e. the maximum number of successive days with very small wind and solar power output. The analyses presented in this study highlight the necessity of using long-term meteorological data when estimating the economics of high penetration of variable renewables, as well as the importance of considering the risk of power supply disruption.

著者

古川 慶人 小宮山 涼一 藤井 康正

出版者

一般社団法人 エネルギー・資源学会

雑誌

エネルギー・資源学会論文誌 (ISSN:24330531)

巻号頁・発行日

vol.43, no.6, pp.225-234, 2022-11-10 (Released:2022-11-10)

参考文献数

19

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Cryogenic Direct-air CO2 Capture (Cryogenic DAC), the technology of capturing atmospheric CO2 by desublimiting it as dry ice, can effectively utilize the abundant wind energy in Antarctica and it is estimated that the energy requirement will be competitive towards conventional aqueous solution DAC if substantial efficiency improvements and system enhancements occur. However, it hasn’t been implemented yet and the energy requirement and capital cost are uncertain. In this study, the feasibility of cryogenic DAC is analyzed by conducting a sensitivity analysis on the energy requirement/capital cost of cryogenic DAC and the capital cost of wind/solar energy in Antarctica under the 1.5℃/2.0℃ goals in Paris Agreement. As a result, if the capital cost of wind/solar power in Antarctica is the same as in Alaska the energy requirement/capital cost of cryogenic DAC require to be lower than that of aqueous solution DAC for cryogenic DAC introduction in both goals. In addition, when the energy requirement/capital cost of cryogenic DAC are fixed, it is found that the capital cost of wind/solar power generation in Antarctica requires to be limited to about 1.2 times the global standard cost for cryogenic DAC introduction in the 1.5℃ goal.

著者

小宮山 涼一

出版者

一般社団法人 日本原子力学会

雑誌

日本原子力学会誌ATOMOΣ (ISSN:18822606)

巻号頁・発行日

vol.63, no.12, pp.830-835, 2021

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<p> 水素やCCUS技術は,現状の対策では脱炭素化が困難な部門に対するCO₂削減・除去対策として国際的な関心を集めている。水素は,鉄鋼や化学,航空,貨物車等での利用や,水素発電の導入が計画されており,水素輸入に向けたサプライチェーンの検討の動きが進展している。CCUS技術はCO₂回収や貯留に加え,カーボンリサイクルを通じて,脱炭素化への貢献が期待されている。ただし,水素やCCUS技術ともに,本格的な普及拡大に向けては,技術開発,コスト,インフラ整備に係る課題克服が重要となる。</p>

著者

小宮山 涼一 柿木 達朗

出版者

日本エネルギー経済研究所

雑誌

エネルギー経済 (ISSN:02878828)

巻号頁・発行日

vol.33, no.3, pp.1-24, 2007-06

著者

小宮山 涼一 柴田 紗英子 藤井 康正

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.133, no.3, pp.263-270, 2013-03-01 (Released:2013-03-01)

参考文献数

11

被引用文献数

2 9

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This paper evaluates optimal power generation mix considering massive deployment of variable renewable energy and regional power interchange. Japan has initiated feed-in-tariff (FIT) and expected significant introduction of PV and wind power for energy self-sufficiency and climate change. Wind power resource in Japan, however, concentrates mainly on Hokkaido and Tohoku region which is remote from electricity-consuming area such as Tokyo, and facilitating the considerable deployment of wind power requires the establishment of inter-regional power transmission line. On these backgrounds, we develop optimal power generation mix model including regional electricity exchange as large-scale linear programming model with 10 million variables and 30 million constraints. Calculated results show that regional grid expansion encourages wind power installation in Hokkaido and Tohoku region for supplying it to Tokyo area where PV power and stationary battery are alternatively replaced. The grid expansion, as well, promotes the shift of PV installation to Kyushu and Shikoku region which have longer sunshine duration, and interchangeably mitigates PV deployment in other regions through the transport of PV power from those two regions.