Page:Municipal Handbook of Auckland 1922.djvu/189

 coupled to a 300 K.W. direct current generator, steam being supplied by four Babcock and Wilcox water tube boilers. From time to time additions have been made, comprising eight boilers and the following generating plant:—Two 600 K.W. direct current sets, one 600 K.W. and three 1,000 K.W. alternating current sets, together with the requisite auxiliary plant and standard switch gear.

The boilers are fitted with automatic chain grate stokers and superheaters, and the gases from them pass through two Green's Economisers to two steel chimneys 125ft. high, lined with concrete and brick.

Coal is handled by means of a conveyor driven by electricity.

The engines exhaust into surface condensers, the circulating water for which is drawn from the harbour at Hobson Street Wharf by four motor-driven pumps, installed in a building opposite the Hobson Street Baths. The water after passing through the condensers and becoming heated is used in the baths before its return to the sea.

The total capacity of the power station is now just under 6,000 K.W.

The number of units generated for the year ended 31st March, 1921, amounted to over thirteen million.

A sub-station has been erected at Green Lane, off Manukau Road, to which power is transmitted at a voltage of 5,500 and distributed, at the ordinary voltage