The paper's entire thesis is an era comparison showing electricity/petroleum demand became more price-responsive; both electricity own-price short-run estimates (1971-74 and 1979-82) are the reported headline results, so both are marked preferred || 'Demand functions are now more responsive to price changes... Significant changes in the short- and long-run price elasticities can be expected' (abstract, p.206) and 'Electricity consumption was found to have a slight increase in short-run own- and cross-price elasticities' (p.210)
Dunstan, R.H., and R.H. Schmidt (1988): “Structural Changes in Residential Energy Demand.” Energy Economics 10(3), 206-212