More likely it's down to the country substituting domestic coal for imported oil which it can no longer afford to buy with hard currency.

Primary energy sources in the late 1940s, for example, were domestic coal and charcoal.

Michael Heseltine let his deputy Tim Eggar put the case that the government had tried to encourage the market for domestic coal.

This handled domestic coal until closure in June 1964.

Norfolk Southern is a major transporter of domestic and export coal in the eastern half of the country.

The plan also targets an increase in domestic and important coal based power plants, and more on-shore or off-shore gas exploration.

The approved plan gives preferential access to the wholesale electricity market in Spain for power plants that run on domestic coal.

As can be expected the majority of traffic was agricultural in nature although photographs indicate some inward domestic coal was received.

Imported coal emits just the same amount of CO2 as domestic coal.

I would like to emphasise once again that it makes no difference to the climate whether we burn imported or domestic coal.