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Research into the Spatiotemporal Characteristics and Influencing Factors of Technological Innovation in China’s Natural Gas Industry from the Perspective of Energy Transition

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  • Shuguang Liu

    (School of Economics, Ocean University of China, 238 Songling Rd., Qingdao 266100, China
    Institute of Marine Development, Ocean University of China, 238 Songling Rd., Qingdao 266100, China)

  • Jiayi Wang

    (School of Economics, Ocean University of China, 238 Songling Rd., Qingdao 266100, China)

  • Yin Long

    (Sinopec Shandong Gas Sales Center, 77 Tianchen Rd., Jinan 250014, China)

Abstract

Promoting technological innovation in the natural gas industry is a feasible means of achieving energy transition. Guided by the geographic innovation theory, this article carries out research on the scale, technical fields, capabilities, and influencing factors of technological innovation in the natural gas industry of 312 Chinese prefecture-level cities, making use of the cusp catastrophe model, the center of gravity and standard deviational ellipse, exploratory spatial data analysis, and geographically and temporally weighted regression (GTWR). The research shows the following: (1) Technological innovation in China’s natural gas industry has continuously expanded in terms of scale, with the number of participating cities increasing, showing a spatially uneven pattern of local agglomeration and national diffusion. (2) There have been significant innovation achievements in natural gas equipment and engineering, but natural gas utilization is lagging in comparison, with drilling, new materials, environmental protection, pipe network engineering, and digital services becoming frontier fields, and collaborative innovation with the thermoelectric, metalworking, automotive, and other related industries having been initially established. (3) The unevenness of technological innovation capabilities is obvious, with the core advantages of Beijing–Tianjin being continuously strengthened and Sichuan–Chongqing, the Yangtze River Delta, the Pearl River Delta, Shandong Peninsula, and Liaodong Peninsula forming high-level technological innovation capability agglomerations. (4) The spatiotemporal pattern of technological innovation capability is the result of multiple factors, with northeastern cities mainly being affected by natural gas demands, northwestern cities being highly sensitive to capital strength, eastern cities mostly relying on urban development, and cities in North China mainly being bolstered by the strength of talent. (5) It is necessary to carry out further multi-agent and multi-scale future research on technological innovation in the natural gas industry and its relationship with the energy transition and to explore the interactivity of the influencing factors. This study may provide strategies for technological innovation in the natural gas industry from the perspective of the energy transition.

Suggested Citation

  • Shuguang Liu & Jiayi Wang & Yin Long, 2023. "Research into the Spatiotemporal Characteristics and Influencing Factors of Technological Innovation in China’s Natural Gas Industry from the Perspective of Energy Transition," Sustainability, MDPI, vol. 15(9), pages 1-34, April.
  • Handle: RePEc:gam:jsusta:v:15:y:2023:i:9:p:7143-:d:1131883
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    1. Gao, Xue & Zhang, Yi, 2022. "What is behind the globalization of technology? Exploring the interplay of multi-level drivers of international patent extension in the solar photovoltaic industry," Renewable and Sustainable Energy Reviews, Elsevier, vol. 163(C).
    2. Guilhot, Laëtitia, 2022. "An analysis of China's energy policy from 1981 to 2020: Transitioning towards to a diversified and low-carbon energy system," Energy Policy, Elsevier, vol. 162(C).
    3. Feng Liu & Yihang Wei & Yu Du & Tao Lv, 2022. "Mechanism and Influencing Factors of Low-Carbon Coal Power Transition under China’s Carbon Trading Scheme: An Evolutionary Game Analysis," IJERPH, MDPI, vol. 20(1), pages 1-15, December.
    4. Shuguang Liu & Jiayi Wang, 2022. "Coupling Coordination between Marine S&T Innovation and the High-Quality Development of the Marine Economy: A Case Study of China’s Coastal Provinces," Sustainability, MDPI, vol. 14(12), pages 1-29, June.
    5. Huang, Yu Wen & Kittner, Noah & Kammen, Daniel M., 2019. "ASEAN grid flexibility: Preparedness for grid integration of renewable energy," Energy Policy, Elsevier, vol. 128(C), pages 711-726.
    6. Andrews, Michael J. & Whalley, Alexander, 2022. "150 years of the geography of innovation," Regional Science and Urban Economics, Elsevier, vol. 94(C).
    7. Roderik Ponds & Frank van Oort & Koen Frenken, 2010. "Innovation, spillovers and university--industry collaboration: an extended knowledge production function approach," Journal of Economic Geography, Oxford University Press, vol. 10(2), pages 231-255, March.
    8. Michael Benson & Chad Boda & Runa R. Das & Leslie King & Chad Park, 2022. "Sustainable Development and Canada’s Transitioning Energy Systems," Sustainability, MDPI, vol. 14(4), pages 1-19, February.
    9. Mao, Wenxin & Wang, Wenping & Sun, Huifang & Yao, Peiyi & Wang, Xiaolei & Luo, Dang, 2021. "Urban industrial transformation patterns under natural resource dependence: A rule mining technique," Energy Policy, Elsevier, vol. 156(C).
    10. Jan Ole Rypestøl & Roman Martin & Nina Kyllingstad, 2022. "New regional industrial path development and innovation networks in times of economic crisis," Industry and Innovation, Taylor & Francis Journals, vol. 29(7), pages 879-898, August.
    11. Arnab Bhattacharjee & Ornella Maietta & Fernanda Mazzotta, 2023. "Spatial agglomeration, innovation and firm survival for Italian manufacturing firms," Spatial Economic Analysis, Taylor & Francis Journals, vol. 18(3), pages 318-345, July.
    12. Gürsan, C. & de Gooyert, V., 2021. "The systemic impact of a transition fuel: Does natural gas help or hinder the energy transition?," Renewable and Sustainable Energy Reviews, Elsevier, vol. 138(C).
    13. Lei Jin & Keran Duan & Xu Tang, 2018. "What Is the Relationship between Technological Innovation and Energy Consumption? Empirical Analysis Based on Provincial Panel Data from China," Sustainability, MDPI, vol. 10(1), pages 1-13, January.
    14. Taewook Huh & Kee-Young Yoon & I Re Chung, 2019. "Drivers and Ideal Types towards Energy Transition: Anticipating the Futures Scenarios of OECD Countries," IJERPH, MDPI, vol. 16(8), pages 1-16, April.
    15. Tenaw, Dagmawe, 2022. "Do traditional energy dependence, income, and education matter in the dynamic linkage between clean energy transition and economic growth in sub-Saharan Africa?," Renewable Energy, Elsevier, vol. 193(C), pages 204-213.
    16. Philip Cooke & Sérgio Nunes, 2022. "Post-Coronavirus regional innovation policies: from mega to giga and beyond through sustainable spatial planning of global tourism," European Planning Studies, Taylor & Francis Journals, vol. 30(11), pages 2205-2223, November.
    17. Jing Wu & Rayman Mohamed & Zheng Wang, 2017. "An Agent-Based Model to Project China’s Energy Consumption and Carbon Emission Peaks at Multiple Levels," Sustainability, MDPI, vol. 9(6), pages 1-19, May.
    18. Liu, Weiwei & Song, Yifan & Bi, Kexin, 2021. "Exploring the patent collaboration network of China's wind energy industry: A study based on patent data from CNIPA," Renewable and Sustainable Energy Reviews, Elsevier, vol. 144(C).
    19. Tian, Peng & Lin, Boqiang, 2017. "Promoting green productivity growth for China's industrial exports: Evidence from a hybrid input-output model," Energy Policy, Elsevier, vol. 111(C), pages 394-402.
    20. Liu, Dawei & Xu, Hang, 2021. "A rational policy decision or political deal? A multiple streams' examination of the Russia-China natural gas pipeline," Energy Policy, Elsevier, vol. 148(PB).
    21. R. C. Assunção, Lorena & A. S. Mendes, Pietro & Matos, Stelvia & Borschiver, Suzana, 2021. "Technology roadmap of renewable natural gas: Identifying trends for research and development to improve biogas upgrading technology management," Applied Energy, Elsevier, vol. 292(C).
    22. Lei Shi & Shan Gao & Airong Xu & Kexin Zheng & Yuanpeng Ji & Xianlei Dong & Lizhi Xing, 2023. "Influence of Enterprise’s Factor Inputs and Co-Opetition Relationships to Its Innovation Output," Sustainability, MDPI, vol. 15(1), pages 1-23, January.
    23. Sainan Cheng & Guohua Qu, 2023. "Research on the Effect of Digital Economy on Carbon Emissions under the Background of “Double Carbon”," IJERPH, MDPI, vol. 20(6), pages 1-27, March.
    24. Asher Curtis & Sarah McVay & Sara Toynbee, 2020. "The changing implications of research and development expenditures for future profitability," Review of Accounting Studies, Springer, vol. 25(2), pages 405-437, June.
    25. Thomas, Melanee & DeCillia, Brooks & Santos, John B. & Thorlakson, Lori, 2022. "Great expectations: Public opinion about energy transition," Energy Policy, Elsevier, vol. 162(C).
    26. Mohammed N. Khan & Schalk Cloete & Shahriar Amini, 2020. "Efficient Production of Clean Power and Hydrogen Through Synergistic Integration of Chemical Looping Combustion and Reforming," Energies, MDPI, vol. 13(13), pages 1-19, July.
    27. Jan H. Miedema & Henny J. Van der Windt & Henri C. Moll, 2018. "Opportunities and Barriers for Biomass Gasification for Green Gas in the Dutch Residential Sector," Energies, MDPI, vol. 11(11), pages 1-20, November.
    28. Weiwei Xiong & Liang Yan & Teng Wang & Yuguo Gao, 2020. "Substitution Effect of Natural Gas and the Energy Consumption Structure Transition in China," Sustainability, MDPI, vol. 12(19), pages 1-20, September.
    29. Héctor Álvarez & Guillermo Domínguez & Almudena Ordóñez & Javier Menéndez & Rodrigo Álvarez & Jorge Loredo, 2021. "Mine Water for the Generation and Storage of Renewable Energy: A Hybrid Hydro–Wind System," IJERPH, MDPI, vol. 18(13), pages 1-18, June.
    30. Siying Yang & Shunyu Ma & Jingjing Lu, 2022. "Can government venture capital guidance funds promote urban innovation? Evidence from China," Growth and Change, Wiley Blackwell, vol. 53(2), pages 753-770, June.
    31. Paul M. Romer, 1994. "The Origins of Endogenous Growth," Journal of Economic Perspectives, American Economic Association, vol. 8(1), pages 3-22, Winter.
    32. Hausfather, Zeke, 2015. "Bounding the climate viability of natural gas as a bridge fuel to displace coal," Energy Policy, Elsevier, vol. 86(C), pages 286-294.
    33. Kemfert, Claudia & Präger, Fabian & Braunger, Isabell & Hoffart, Franziska M. & Brauers, Hanna, 2022. "The expansion of natural gas infrastructure puts energy transitions at risk," EconStor Open Access Articles and Book Chapters, ZBW - Leibniz Information Centre for Economics, vol. 7, pages 582-587.
    34. Huaping Zhang & Yue Dong, 2022. "Measurement and Spatial Correlations of Green Total Factor Productivities of Chinese Provinces," Sustainability, MDPI, vol. 14(9), pages 1-15, April.
    35. Peipei Chen & Yi Wu & Jing Meng & Pan He & Deyu Li & D’ Maris Coffman & Xi Liang & Dabo Guan, 2022. "The heterogeneous role of energy policies in the energy transition of Asia–Pacific emerging economies," Nature Energy, Nature, vol. 7(7), pages 588-596, July.
    36. Fan, Meiting & Li, Mengxu & Liu, Jianghua & Shao, Shuai, 2022. "Is high natural resource dependence doomed to low carbon emission efficiency? Evidence from 283 cities in China," Energy Economics, Elsevier, vol. 115(C).
    37. Hassani, Hossein & Silva, Emmanuel Sirimal & Al Kaabi, Ahmed Mohamed, 2017. "The role of innovation and technology in sustaining the petroleum and petrochemical industry," Technological Forecasting and Social Change, Elsevier, vol. 119(C), pages 1-17.
    38. Ahmed, Noor A. & Cameron, Michael, 2014. "The challenges and possible solutions of horizontal axis wind turbines as a clean energy solution for the future," Renewable and Sustainable Energy Reviews, Elsevier, vol. 38(C), pages 439-460.
    39. Adrian Neacșa & Mirela Panait & Jianu Daniel Mureșan & Marian Catalin Voica & Otilia Manta, 2022. "The Energy Transition between Desideratum and Challenge: Are Cogeneration and Trigeneration the Best Solution?," IJERPH, MDPI, vol. 19(5), pages 1-22, March.
    40. Feng Dong & Chang Qin & Xiaoyun Zhang & Xu Zhao & Yuling Pan & Yujin Gao & Jiao Zhu & Yangfan Li, 2021. "Towards Carbon Neutrality: The Impact of Renewable Energy Development on Carbon Emission Efficiency," IJERPH, MDPI, vol. 18(24), pages 1-23, December.
    41. Usman, Muhammad & Balsalobre-Lorente, Daniel, 2022. "Environmental concern in the era of industrialization: Can financial development, renewable energy and natural resources alleviate some load?," Energy Policy, Elsevier, vol. 162(C).
    42. Linyan Chen & Xin Gao & Shitao Gong & Zhou Li, 2020. "Regionalization of Green Building Development in China: A Comprehensive Evaluation Model Based on the Catastrophe Progression Method," Sustainability, MDPI, vol. 12(15), pages 1-22, July.
    43. Solarin, Sakiru Adebola & Gil-Alana, Luis A. & Lafuente, Carmen, 2020. "An investigation of long range reliance on shale oil and shale gas production in the U.S. market," Energy, Elsevier, vol. 195(C).
    44. Wang, Ye, 2023. "What drives sustainable development? Evaluating the role of oil and coal resources for selected resource rich economies," Resources Policy, Elsevier, vol. 80(C).
    45. Carlson, D'Arcy & Robinson, Stacy-ann & Blair, Catherine & McDonough, Marjorie, 2021. "China's climate ambition: Revisiting its First Nationally Determined Contribution and centering a just transition to clean energy," Energy Policy, Elsevier, vol. 155(C).
    46. Seong K. Byun & Jong-Min & Han Xia, 2021. "Incremental vs. Breakthrough Innovation: The Role of Technology Spillovers," Management Science, INFORMS, vol. 67(3), pages 1779-1802, March.
    47. Longwu Liang & Zhen Bo Wang & Dong Luo & Ying Wei & Jingwen Sun, 2020. "Synergy effects and it’s influencing factors of China’s high technological innovation and regional economy," PLOS ONE, Public Library of Science, vol. 15(5), pages 1-25, May.
    48. Jaakko Simonen & Philip McCann, 2010. "Knowledge transfers and innovation: The role of labour markets and R&D co‐operation between agents and institutions," Papers in Regional Science, Wiley Blackwell, vol. 89(2), pages 295-309, June.
    49. Li, Fengyun & Li, Xingmei & Zheng, Haofeng & Yang, Fei & Dang, Ruinan, 2021. "How alternative energy competition shocks natural gas development in China: A novel time series analysis approach," Resources Policy, Elsevier, vol. 74(C).
    50. Pashchenko, Dmitry, 2022. "Natural gas reforming in thermochemical waste-heat recuperation systems: A review," Energy, Elsevier, vol. 251(C).
    51. Qin, Yue & Tong, Fan & Yang, Guang & Mauzerall, Denise L., 2018. "Challenges of using natural gas as a carbon mitigation option in China," Energy Policy, Elsevier, vol. 117(C), pages 457-462.
    52. Jun Fu & Rui Ding & Yilin Zhang & Tao Zhou & Yiming Du & Yuqi Zhu & Linyu Du & Lina Peng & Jian Zou & Wenqian Xiao, 2022. "The Spatial-Temporal Transition and Influencing Factors of Green and Low-Carbon Utilization Efficiency of Urban Land in China under the Goal of Carbon Neutralization," IJERPH, MDPI, vol. 19(23), pages 1-25, December.
    53. Carter W. Page, 2014. "The Impact of Innovation in Geotechnology on Energy and the Environment," Global Policy, London School of Economics and Political Science, vol. 5(1), pages 63-69, February.
    54. Zheng-Xia He & Shi-Chun Xu & Qin-Bin Li & Bin Zhao, 2018. "Factors That Influence Renewable Energy Technological Innovation in China: A Dynamic Panel Approach," Sustainability, MDPI, vol. 10(1), pages 1-30, January.
    55. Sarah M. Jordaan & Andrew W. Ruttinger & Kavita Surana & Destenie Nock & Scot M. Miller & Arvind P. Ravikumar, 2022. "Global mitigation opportunities for the life cycle of natural gas-fired power," Nature Climate Change, Nature, vol. 12(11), pages 1059-1067, November.
    56. Laëtitia Guilhot, 2022. "An analysis of China's energy policy from 1981 to 2020: Transitioning towards to a diversified and low-carbon energy system," Post-Print halshs-03548757, HAL.
    57. Shao, Shuai & Zhang, Xuebin & Yang, Lili, 2023. "Natural resource dependence and urban shrinkage: The role of human capital accumulation," Resources Policy, Elsevier, vol. 81(C).
    58. Eleftherios Thalassinos & Marta Kadłubek & Le Minh Thong & Tran Van Hiep & Erginbay Ugurlu, 2022. "Managerial Issues Regarding the Role of Natural Gas in the Transition of Energy and the Impact of Natural Gas Consumption on the GDP of Selected Countries," Resources, MDPI, vol. 11(5), pages 1-22, April.
    59. Flavio L. Pinheiro & Pierre-Alexandre Balland & Ron Boschma & Dominik Hartmann, 2022. "The Dark Side of the Geography of Innovation. Relatedness, Complexity, and Regional Inequality in Europe," Papers in Evolutionary Economic Geography (PEEG) 2202, Utrecht University, Department of Human Geography and Spatial Planning, Group Economic Geography, revised Jan 2022.
    60. Dongsheng Yan & Wei Sun, 2022. "Study on the Evolution, Driving Factors, and Regional Comparison of Innovation Patterns in the Yangtze River Delta," Land, MDPI, vol. 11(6), pages 1-21, June.
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