Operational and Environmental Efficiencies of Japanese Electric Power Companies from 2003 to 2015: Influence of Market Reform and Fukushima Nuclear Power Accident

Table 3

Results of operational efficiency for nine electric power companies.

	Hokkaido	Tohoku	Tokyo	Chubu	Hokuriku	Kansai	Chugoku	Shikoku	Kyushu
OEV: model (5) operational efficiency (VRTS)
2003	1.000	0.952	0.971	1.000	1.000	0.979	0.950	1.000	0.968
2004	1.000	0.911	1.000	1.000	1.000	0.994	0.996	1.000	0.984
2005	0.989	0.936	1.000	1.000	1.000	0.992	0.990	0.952	0.969
2006	1.000	0.950	1.000	1.000	0.994	0.986	1.000	0.976	0.973
2007	1.000	0.949	1.000	1.000	0.979	0.980	1.000	1.000	0.958
2008	0.873	0.936	1.000	0.997	0.980	0.935	0.961	1.000	0.922
2009	0.899	0.912	0.986	0.994	1.000	0.947	0.950	1.000	0.922
2010	0.902	0.922	1.000	1.000	1.000	0.979	0.954	1.000	0.936
2011	0.911	0.751	1.000	0.932	0.956	0.868	0.934	1.000	0.764
2012	0.819	0.812	0.959	0.913	0.920	0.830	0.894	0.939	0.716
2013	0.755	0.935	1.000	0.956	0.885	0.898	0.924	1.000	0.867
2014	0.834	1.000	1.000	1.000	0.896	0.919	0.920	0.994	0.847
2015	0.876	0.979	0.970	1.000	0.855	0.961	0.912	0.978	0.891
Average	0.912	0.919	0.991	0.984	0.959	0.944	0.953	0.988	0.901
OEC: model (5) operational efficiency (CRTS)
2003	0.990	0.951	0.903	1.000	1.000	0.965	0.937	0.956	0.967
2004	0.980	0.907	0.938	1.000	1.000	0.987	0.983	0.960	0.982
2005	0.948	0.935	0.959	1.000	1.000	0.982	0.975	0.931	0.964
2006	0.979	0.948	0.969	1.000	0.971	0.976	0.979	0.955	0.963
2007	0.925	0.948	0.903	1.000	0.936	0.969	0.989	1.000	0.947
2008	0.806	0.935	0.916	0.997	0.980	0.913	0.948	1.000	0.918
2009	0.857	0.905	0.909	0.993	0.940	0.938	0.937	0.957	0.917
2010	0.871	0.915	0.885	1.000	0.923	0.965	0.942	0.948	0.928
2011	0.832	0.745	1.000	0.927	0.864	0.822	0.921	0.897	0.761
2012	0.694	0.805	0.866	0.902	0.838	0.781	0.878	0.785	0.706
2013	0.752	0.934	1.000	0.949	0.834	0.866	0.924	0.936	0.864
2014	0.832	1.000	0.957	1.000	0.849	0.880	0.917	0.912	0.844
2015	0.873	0.978	0.942	1.000	0.826	0.949	0.911	0.920	0.890
Average	0.872	0.916	0.934	0.982	0.920	0.923	0.942	0.935	0.896
SOE: scale efficiency
2003	0.990	0.999	0.930	1.000	1.000	0.986	0.987	0.956	0.999
2004	0.980	0.996	0.938	1.000	1.000	0.994	0.987	0.960	0.997
2005	0.958	0.999	0.959	1.000	1.000	0.989	0.984	0.978	0.995
2006	0.979	0.998	0.969	1.000	0.977	0.989	0.979	0.978	0.990
2007	0.925	0.999	0.903	1.000	0.956	0.989	0.989	1.000	0.989
2008	0.924	0.998	0.916	1.000	1.000	0.976	0.986	1.000	0.995
2009	0.953	0.993	0.922	0.999	0.940	0.990	0.987	0.957	0.995
2010	0.965	0.993	0.885	1.000	0.923	0.986	0.988	0.948	0.991
2011	0.913	0.993	1.000	0.995	0.904	0.947	0.986	0.897	0.996
2012	0.847	0.992	0.903	0.988	0.911	0.941	0.982	0.836	0.985
2013	0.997	0.999	1.000	0.993	0.943	0.964	1.000	0.936	0.997
2014	0.998	1.000	0.957	1.000	0.947	0.958	0.997	0.918	0.997
2015	0.996	0.999	0.972	1.000	0.967	0.987	0.999	0.941	1.000
Average	0.956	0.997	0.943	0.998	0.960	0.977	0.988	0.947	0.994