Table 5 SOUTH WALES: CORPORATE STRUCTURE OF ELECTRICITY HOLDING COMPANIES 1934/35
| British Electric Traction Co. | 1.1 Merthyr Tydfil ET & L Co. 1.2 Penarth E L Co. |
| Edmundson’s Electricity Corporation Ltd | 2.1 Shropshire, Worcestershire & Staffordshire E P Co. 2.2 South Wales E P Co. |
| General Electric Co. Ltd | 3.1 Carmarthen E S Co. 3.2 Monmouth E S Co 3.3 Porthcawl E Co. 3.4 West Cambrian Power Co. |
| Power Securities/Balfour Beatty | 4.1 Llanelly & District E Co. 4.2 Gorseinon E L Co. |
| Yorkshire Electric Power Co. | 5.1 West Gloucestershire Power Co. 5.2 Chepstow E L & P Co. |
| Other companies | 6 Aberayron 7 Ogmore Valley 8 Pontypool |
Source: Political and Economic Planning, Report on the Supply of Electricity in Great Britain (London: PEP, 1936), pp.140-141.
