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

Table 2

Results of environmental efficiency for nine electric power companies.

	Hokkaido	Tohoku	Tokyo	Chubu	Hokuriku	Kansai	Chugoku	Shikoku	Kyushu
EEV: model (1) environmental efficiency (VRTS)
2003	0.768	1.000	1.000	1.000	1.000	1.000	0.642	1.000	1.000
2004	0.783	0.819	1.000	0.934	1.000	0.908	0.644	1.000	1.000
2005	0.838	0.774	1.000	1.000	1.000	1.000	0.649	0.959	1.000
2006	0.826	0.830	1.000	1.000	0.908	1.000	0.645	0.998	1.000
2007	0.802	0.788	1.000	1.000	1.000	0.937	0.641	0.988	1.000
2008	0.697	1.000	1.000	0.837	0.850	1.000	0.624	1.000	0.909
2009	0.910	0.815	1.000	0.854	1.000	1.000	0.628	0.952	1.000
2010	1.000	0.877	1.000	1.000	1.000	1.000	0.590	1.000	1.000
2011	1.000	1.000	1.000	1.000	0.792	1.000	0.646	0.751	1.000
2012	0.749	0.749	1.000	1.000	1.000	0.910	0.629	1.000	0.823
2013	1.000	0.889	1.000	0.939	0.761	0.798	0.608	0.737	0.709
2014	0.837	1.000	1.000	0.949	0.712	1.000	0.645	1.000	0.851
2015	1.000	1.000	0.978	0.873	0.641	1.000	0.667	1.000	1.000
Average	0.862	0.888	0.998	0.953	0.897	0.966	0.635	0.953	0.946
EEC: model (1) environmental efficiency (CRTS)
2003	0.713	0.874	0.760	0.856	1.000	1.000	0.621	1.000	0.919
2004	0.705	0.811	0.844	0.879	0.924	0.892	0.623	0.944	1.000
2005	0.730	0.767	0.843	1.000	1.000	0.950	0.633	0.900	1.000
2006	0.719	0.828	0.895	0.920	0.873	0.969	0.633	0.946	1.000
2007	0.713	0.782	0.842	0.835	1.000	0.907	0.633	0.987	1.000
2008	0.667	0.944	0.916	0.837	0.838	1.000	0.615	1.000	0.897
2009	0.789	0.807	0.874	0.853	0.929	1.000	0.607	0.908	1.000
2010	0.904	0.869	1.000	1.000	0.861	1.000	0.571	0.949	1.000
2011	0.812	1.000	1.000	0.970	0.652	1.000	0.637	0.715	1.000
2012	0.646	0.743	1.000	1.000	0.728	0.910	0.620	0.661	0.810
2013	1.000	0.853	1.000	0.937	0.660	0.797	0.598	0.703	0.708
2014	0.837	1.000	1.000	0.934	0.650	1.000	0.644	0.731	0.818
2015	1.000	0.982	0.969	0.870	0.608	0.891	0.651	0.798	0.938
Average	0.787	0.866	0.919	0.915	0.825	0.947	0.622	0.865	0.930
SEE: scale efficiency
2003	0.928	0.874	0.760	0.856	1.000	1.000	0.967	1.000	0.919
2004	0.900	0.990	0.844	0.941	0.924	0.983	0.968	0.944	1.000
2005	0.871	0.991	0.843	1.000	1.000	0.950	0.976	0.939	1.000
2006	0.870	0.999	0.895	0.920	0.961	0.969	0.983	0.948	1.000
2007	0.888	0.992	0.842	0.835	1.000	0.968	0.987	0.999	1.000
2008	0.957	0.944	0.916	0.999	0.986	1.000	0.986	1.000	0.987
2009	0.868	0.991	0.874	0.998	0.929	1.000	0.967	0.954	1.000
2010	0.904	0.991	1.000	1.000	0.861	1.000	0.968	0.949	1.000
2011	0.812	1.000	1.000	0.970	0.824	1.000	0.985	0.951	1.000
2012	0.863	0.991	1.000	1.000	0.728	1.000	0.985	0.661	0.985
2013	1.000	0.959	1.000	0.997	0.867	0.998	0.985	0.953	0.999
2014	1.000	1.000	1.000	0.985	0.913	1.000	0.999	0.731	0.961
2015	1.000	0.982	0.991	0.997	0.949	0.891	0.976	0.798	0.938
Average	0.913	0.976	0.920	0.960	0.919	0.981	0.980	0.908	0.984