Part IV Protective provisions

30 For mutual protection of National Power and PowerGen
The powers conferred upon National Power by this Act shall not be exercised south-east of an imaginary line drawn between reference point TA1714 1940 and reference point TA1746 1960 without the consent of PowerGen and the powers conferred upon PowerGen by this Act shall not be exercised north-west of that line without the consent of National Power.