Geelong Power Station, Victoria

The city of Geelong, Victoria, Australia was once home to two coal fueled power stations - Geelong A and Geelong B.

Geelong's electrical supply

The first moves to providing an electricity supply to Geelong were made in 1898, with three separate companies vying for the right to operate in the city. Two of these companies merged to form the Electric Lighting and Traction Company of Australia, who built the Geelong A power station. The company was later taken over by the Melbourne Electric Supply Company, who remained the supplier of electricity to Geelong until September 1 1930, when the company was purchased by the State Electricity Commission of Victoria.

In 1936 Geelong was connected to the state electrical grid, and by the 1960s Geelong A had closed. Geelong B remained for a few more years being used for peak loads only, but closed in 1970 due to the much higher efficiency of the new power stations in Victoria's Latrobe Valley.

Geelong A

The Geelong A power station was located on the corner of Yarra and Brougham Streets in the city. It was erected by the Electric Lighting and Traction Company of Australia, who laid the foundation stone in March 1900. On June 4 1900 the first power pole was erected in Geelong, on the corner of McKillop and Yarra Streets opposite the Jewish Synagogue. The work was completed by May 1901, and on May 3 a ceremony was held to switch on the supply of electricity to Geelong.

Design

The power station was originally of 200 kilowatts capacity, and supplied electricity at 440/220 volts DC current. Equipment at the station consisted of:
* two 100 kW Belliss-Brush steam dynamos
* two boilers of dry back return tube type, operating at 120 psi steam pressure, with Green's economisers also fitted
* high brick chimney
* 800 ampere hour secondary battery for lamps in the station.

Condensing water for the boilers was pumped from Corio Bay by electric pump via a cast iron rising main. The power station was only used in daylight hours, with the town run by batteries at night.

Upgrades

In 1920 the original equipment was scrapped, and a three phase 6000 volt 50 cycle system was installed, giving a total generation capacity of 10,500 kilowatts (10.5 MW). The new works included:
* six John Thompson water tube boilers, with a convert|4557|sqft|m2|abbr=on of heating surface, and 200 psi gauge pressure
* four Erith-Riley multiple retort stokers, and two Underfeed company chain grate stokers set up in batteries of two
* one 1,500 kW Brush-Ljungstrom turbo-alternator, and three further sets of Metropolitan-Vickers 3000 kW alternators.
* an additional floor to the administration block
* new water tunnel to Corio Bay tunnelled

Three Peebles-La-Cour rotary converters of 500 kilowatt capacity was also installed to supply DC current for the Geelong tramways and older DC city supplies.

The fuel used was Black coal from Newcastle that was brought from fuel storage yards some distance away. The station was converted to burn brown coal briquettes in 1931, with the stokers to the boiler replaced by locally produced ones of overfeed design. The use of black coal was phased out by 1937.

After 1930 the station was transferred to the State Electricity Commission of Victoria, and was operated with one generator set out of service, giving a useful capacity of 7500 kilowatts, and an overload capacity of 9375 kilowatts. The Geelong Harbour Trust had also been responsible for the supply of electricity to the port of Geelong, with these responsibilities acquired by the SECV from midnight June 13 1938.

Closure

The rotary converters ceased functioning on July 17 1961, resulting in the DC current supply being terminated. This also marked the end of 'Geelong A' as a generating unit. However, the plant was retained until 1967, with the sale of equipment being carried out in 1966-67, and dismantling and removal planned to take 7 to 8 months.

Sale of the building was dependent on the SECV Distribution Depot being moved to North Geelong, the conversion of older 6.6 kV feeders to a more modern 22 kV system, and the removal of the 6.6 kV switching structure and capacitor banks at old station.

The building was sold at auction on June 11 1970 for $45,000 to a Mr I. Watson acting on behalf of unknown company. Development plans were floated for the site throughout the 1980s, but it was not until Bay City Plaza shopping centre was built that anything was done. The facade of the administration block remains as part of the shopping centre today.

Geelong B

The Geelong B power station was of 30,000 kilowatt (30 MW) capacity and located at North Geelong on the edge of Corio Bay. It was also the largest power station in Victoria outside the Latrobe Valley. The plant was officially opened by Honourable J.W.Galbally MLC, Minister in Charge of Electrical Undertakings, on October 8 1954.

Design

Geelong B was a 'packaged' station from components imported from the United States of America and was erected under contract for the State Electricity Commission of Victoria. The contract included the supply and erection of buildings, boilers, generators, transformers, switchgear and coal handling equipment, and putting the station into service.

The power station was of unusual design, with no conventional boiler house, the boilers being out of doors except for the boiler operating face, which helped to reduce building costs. Each of the three boilers was connected to a generator of 10,000 kW capacity. Cooling water for the power station was drawn from Corio Bay, and most of the power generated was used by local industry.

The boilers were automatically controlled, and produced 110,000 pounds of steam per hour (50 Mg/h) at 625 psi (4.3 MPa). Fuel was moved by belt bucket and scraper conveyors to the fuel bunkers, then delivered to the boilers by mechanical spreader stokers.

The fuel used was brown coal purchased by the SECV from Wensley Brae open cut main at Winchelsea, but from 1960 better quality coal was purchased from a mine at Anglesea instead. (The Anglesea mine is now used to fuel the adjacent Anglesea Power Station that opened in 1969.) A third change in fuel supplied occurred soon after, with the boilers being converted to use briquettes brought to Geelong by rail from Yallourn.

Closure

By the 1960s the power station was only used to meet peak loads due to the high operating cost, and the station was closed in 1970 when newer power stations were opened in the Latrobe Valley.

References

* "R. Arklay and I. Sayer" - 'Geelong's Electric Supply' - September 1970
* cite book
last = Begg
first = Peter
title = Geelong - The First 150 Years
publisher = Globe Press
date = 1990
isbn = 0-9592863-5-7