Kalman-filter TVP is the paper's headline method; its final-state industrial value is quoted verbatim || 'the price elasticity starts to recover and reaches -0.160 in 2014' (p.238); abstract: 'A time varying parameter (TVP) model with the Kalman filter is applied' (p.233)
Wang, N., & Mogi, G. (2017): "Industrial and residential electricity demand dynamics in Japan: How did price and income elasticities evolve from 1989 to 2014?" Energy Policy, 106, 233–243.