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Penallta Colliery Electricity Building

A Grade II Listed Building in Ystrad Mynach, Caerphilly

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Latitude: 51.6539 / 51°39'13"N

Longitude: -3.2458 / 3°14'45"W

OS Eastings: 313909

OS Northings: 195742

OS Grid: ST139957

Mapcode National: GBR HV.727R

Mapcode Global: VH6DD.PPDJ

Entry Name: Penallta Colliery Electricity Building

Listing Date: 18 July 2001

Last Amended: 18 July 2001

Grade: II

Source: Cadw

Source ID: 25540

Building Class: Industrial

Location: Situated between the Baths building and the Lamp room, close to the rear of the latter and set slightly higher in the slope.

County: Caerphilly

Community: Gelligaer

Community: Gelligaer

Locality: Penalltau

Built-Up Area: Ystrad Mynach

Traditional County: Glamorgan

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Penallta Colliery was built between 1905 and 1909, at the height of the South Wales coal trade. It was established by the Powell Dyffryn Steam Coal Company, the region's largest mining company, on the most modern principles as the "super-pit" of its day. The surface buildings were laid out in matching architectural style in a spacious, artificially levelled area, on a rectilinear plan giving the ideal spatial arrangement of activities. The design of the enormous engine hall in particular was an important innovation copied at many later collieries. The colliery became one of the largest in Wales with 3,200 miners and a high output of top-quality steam coal. By 1935, Penallta held the European record for coal produced in a single week.


Small building believed to have housed electrical equipment, matching the other original buildings of the colliery in style. Rendered with brick dressings and very shallow-pitched concrete roof. Frontage faces path through colliery complex from Penalltau Road and has segmental-arched doorway, pilasters and cornice; side windows with metal multi-pane frames.


Divided into two rooms; black and red tiled floor; concrete beams to roof; now empty.

Reasons for Listing

Listed as an integral part of this exceptionally fine colliery complex for group value with other listed items

Other nearby listed buildings

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