"Such peak load plant at the load centres as may be required in the future will very possibly consist largely of gas turbines."
I think you attribute too much here: "Haldane had spotted the role gas would end up playing in the system from the 1990s." I imagine that Haldane expected that fuel oil would fire the gas turbines, as it was widely available and could be readily stored on site to meet the peaking need.
"Such peak load plant at the load centres as may be required in the future will very possibly consist largely of gas turbines."
I think you attribute too much here: "Haldane had spotted the role gas would end up playing in the system from the 1990s." I imagine that Haldane expected that fuel oil would fire the gas turbines, as it was widely available and could be readily stored on site to meet the peaking need.