Table 2 SOUTH WALES ELECTRICITY SUPPLY UNDERTAKINGS c.1912
| UNDERTAKING | COUNTY | SUPPLY BEGAN |
| Local Authorities | ||
| Aberdare | Glamorgan | 1911 |
| Abertillery | Monmouth | 1910 |
| Bridgend | Glamorgan | 19031 |
| Briton Ferry UD | Glamorgan | 1910? |
| Cardiff | Glamorgan | 1894 |
| Cardiff RD | Glamorgan | 1908 |
| Ebbw Vale | Monmouth | 1906 |
| Llandilo | Carmarthen | 1902 |
| Monmouth | Monmouth | 1899 |
| Mountain Ash | Glamorgan | 1910 |
| Neath | Glamorgan | 1905 |
| Neath RD | Glamorgan | 19052 |
| Newport | Monmouth | 1895 |
| Pontypridd | Glamorgan | 1905 |
| Swansea | Glamorgan | 1901 |
| Companies | ||
| Ammanford N/S | Carmarthen | 1909 |
| Brynammon N/S | Carmarthen | 1905 |
| Carmarthen | Carmarthen | 1910 |
| Chepstow | Monmouth | 1904 |
| Glais N/S | Glamorgan | 1910 |
| Glantawe | Brecknock | 1910 |
| Gorseinon | Glamorgan | 1894 |
| Llandrindod Wells | Radnor | 1897 |
| Llanelly & District | Carmarthen | 1911 |
| Maerdy N/S | Glsmorgan | 1898 |
| Merthyr Tydfil | Glamorgan | 1901 |
| Narberth N/S | Pembroke | 1912 |
| Newcastle Emlyn N/S | Carmarthen | 1908 |
| Ogmore Valley | Glamorgan | 18923 |
| Penarth | Glamorgan | 1901 |
| Penybank N/S | Carmarthen | 1910 |
| Pontypool | Monmouth | 1893 |
| Radyr | Glamorgan | 19084 |
| South Wales EP Distn Co | Glamorgan/Monmouth | 1904 |
| Talgarth N/S | Brecknock | 1912? |
| Tonyrefail N/S | Glamorgan |
1904? |
Notes: N/S non statutory undertaking (outside 1882/1888 Acts).
[1] Established by South Wales Power Co. Taken over by UDC 1908.
[2] Established by South Wales Power Co. Taken over by RDC 1908.
[3] Originally a non-statutory undertaking. an Electric Lighting Order granted in 1900
[4] This small company served the parish of Radyr under an Electric Lighting Order granted to the Llandaff & Dinas Powys Rural District Council in 1908.
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