Quote:
Two of these are renewable energy projects - one a concentrated solar power project, and the other a project in terms of which underground coal is converted into gas that is used to drive turbines and generate electricity.
Barry MacColl, Eskom's manager for technology, strategy and planning, says the utility is particularly positive about the underground coal-to-gas project.
"The trial project is already operational near Eskom's Majuba power station, and the results are very promising.
"In the process two shafts are drilled in underground veins of coal. The underground coal is then set alight. The burning coal releases flammable gas through the one shaft, which is contained and redirected to gas turbines. These turbines then provide electricity."
MacColl says the reaction is controlled by the quantity of oxygen pumped into the one shaft - and the process can be stopped at any time by cutting off the oxygen supply.
"The advantages are great. First, it becomes unnecessary to mine the coal. Second, atmospheric pollution is largely reduced and the problem of the ash with which coal-fired power stations usually have to contend does not exist. Third, coal previously regarded as impossible to mine can now be exploited."
I thought this sounded like a good idea. I never investigated anything more into it though.