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Dinas pressure tunnel, Rheidol Hydro Electric...

Dinas turbine hall, Rheidol Hydro Electric...

Dinas station control panel, Rheidol Hydro...

Main shaft casing, No.1 turbine, Rheidol Hydro...

Dinas Power Station, Rheidol Hydro Electric...

Nant-y-Moch Dinas Tunnel, Rheidol Hydro...

Nant-y-Moch dam and reservoir, Rheidol Hydro...

Nant-y-Moch dam under construction, Rheidol...

LLYN ALED DAM

BWLCH-Y-GLE DAM, LLYN CLYWEDOG, LLANIDLOES

BWLCH-Y-GLE DAM, LLYN CLYWEDOG, LLANIDLOES

BWLCH-Y-GLE DAM, LLYN CLYWEDOG, LLANIDLOES

NANT HIR RESERVOIR AND DAM, ABERDARE

LLYN ALED DAM

BWLCH-Y-GLE DAM, LLYN CLYWEDOG, LLANIDLOES

LLYN ALED DAM

LLYN ALED DAM

NEATH ABBEY IRONWORKS: AFON CLYDACH DAM

NEATH ABBEY IRONWORKS: AFON CLYDACH DAM

NEATH ABBEY IRONWORKS: AFON CLYDACH DAM

NEATH ABBEY IRONWORKS: AFON CLYDACH DAM

GWAEN GYNFI DAM

Cwm Elan Dam Workers, 1902

RHEIDOL HYDRO-ELECTRIC SCHEME: NANT-Y-MOCH...

Aerial view of Llyn Celyn, Tryweryn Valley, 1963

Construction of dam at Llyn Celyn, Tryweryn Valley

Nant-y-Gro Dam

CLYWEDOG DAM

CABAN COCH DAM, ELAN VALLEY WATER SCHEME

LAKE VYRNWY DAM, LLANWDDYN