Birchills Power Station

Birchills power station and Walsall power station are a series of three coal-fired power stations in, or near, Walsall in the West Midlands, England.

Birchills Power Station
CountryEngland
LocationWest Midlands
Coordinates52.596089°N 1.997785°W / 52.596089; -1.997785
StatusDecommissioned and demolished
Commission date1916
Decommission date1967
Owner(s)Walsall Corporation
(1916–1927)
West Midlands Joint Electricity Authority
(1927–1948)British Electricity Authority
(1948–1955)
Central Electricity Authority
(1955–1957)
Central Electricity Generating Board (CEGB)
(1958–1982)
Operator(s)As owner
Thermal power station
Primary fuelCoal
Turbine technologySteam turbines
Cooling sourceCanal water
Power generation
Units operational2 x 6.25 MW and 1 x 5 MW
Make and modelBrush
Nameplate capacity17.5 MW
Annual net output34.42 GWh (1936), 13.4 GWh (1955)

grid reference SP001998

Walsall power station (1895–1917)

The first electricity supply to Walsall began in the 1890s. In 1890 Walsall Corporation were granted a Provisional Order by the Board of Trade to give them legal powers to generate and supply electricity to Walsall.[1] The Corporation built a power station in Wolverhampton Street Walsall (52°35’10”N 01°59’33”W)[2] which began supplying electricity in 1895.

Plant

The plant at the station consisted coal-fired boilers supplying steam to Chandler compound engines coupled directly to Parker two-pole dynamos.[1] The initial capacity of the plant was 240 kW with a maximum load of 155 kW. New equipment was added and the ultimate generating capacity was 2.6 MW.[2]

Operation

In 1898 74,556 kWh of electricity was sold to 101 customers plus 21,820 kWh for public lighting.  The sale of electricity produced an income for the corporation of £3,025 offset against generating costs of £804.[1] The station was closed in 1917 except for emergency use.[2]

Walsall (Birchills) power station (1916–1967)

Variously known as Birchills power station, Walsall (Birchills) power station, and Birchills (Walsall) power station.

The first power station on the Birchills site was built for Walsall Corporation.[1] Work began in 1914, and electricity was being generated by 1916, although the project was not officially completed until 1922.

Plant

In 1923 the electricity plant comprised 2 × 4 MW[3] and 1 × 5 MW steam turbines driven by 100,000 lb/hr (12.60 kg/s) of steam.[4] Electricity was available to consumers as:

  • 3-phase AC, at 400 and 230 Volts
  • DC at 210 and 105 Volts

The generating capacity by 1930 was 28 MW.[2]

Cooling water was supplied by a pumping station on the Anson Branch canal, equipped with two Mather and Platt pumps capable of delivering 10.6 million gallons (48 Megalitres) per day. Spent water was discharged into the Wyrley and Essington Canal.

After Walsall power station was commissioned in 1949 it provided steam to this station.[5]

Operation

In 1923 the station generated 13.17 GWh of electricity, some of this was used in the plant, the total amount sold was 10.22 GWh. The revenue from sales of current was £84,927, this gave a surplus of revenue over expenses of £40,522.[4]

Ownership of the station passed to the West Midlands Joint Electricity Authority in 1927, and then to the British Electricity Authority following nationalisation in 1948 and subsequently the Central Electricity Authority and the Central Electricity Generating Board (CEGB).[6][7]

The capacity and output of the station in the mid-1930s was:[8]

Birchills power station capacity and output 1934–35
1934–35 1935–36
Plant capacity MW 22.5 22.5
Maximum load MW 17.85 20.55
Maximum demand load factor % 21.3 19.1
Electricity generated MWh 33,866 34,420
Electricity sold MWh 28,609 29,770
Supply to Walsall Corporation MWh 31,254 38,511

The electricity output from the station is shown in the table.[5][9][10]

Station electricity output 1946–67, GWh
Year 1946 1954 1955 1956 1957 1958 1959 1961 1962 1963 1967
Running hours (load factor) 1676 2515 1917 1017 88 2.1% 1.4% 3.04% 0.9%
Station output, GWh 13.212 9.679 13.426 11.414 5.601 0.228 3.423 2.953 2.003 4.256 0.908
Thermal efficiency % 12.67 13.04 13.30 11.22 4.74 13.72 11.48 10.16 7.97

The electricity output in MWh from Walsall (Birchills) power station is shown on the graph.

The power station closed in 1967.[2]

Walsall power station (1949–82)

Walsall power station was sanctioned by the Electricity Commissioners in November 1944 to be owned and operated by the West Midlands Joint Electricity Authority.[5] Construction began in October 1946 on a 64 acre (25.9 ha) site at Birchills north of Walsall town centre and adjacent to the Walsall (Birchills) power station 1916–1967. During construction the British electricity supply industry was nationalised in 1948. The ownership of the incomplete Walsall power station was vested in the British Electricity Authority, and subsequently the Central Electricity Authority and the Central Electricity Generating Board (CEGB).[7]

Plant

The plant at Walsall power station included:[5]

12 × Babcock & Wilcox 180,000 lb/h boilers operating at a pressure of 650 psi and 875°F (22.7 kg/s, 44.8 bar and 468°C). The boilers supplied steam to:

6 × British Thomson-Houston 34 MW, 2-cylinder, double flow, impulse reaction turbines 3,000 rpm coupled to 3-phase 50 Hz alternators operating at 33/36 kV

Diesel engine house-set comprising 2 × 2 MW engines.

Cooling facilities comprised 6 × concrete hyperbolic cooling towers (Mitchell Construction Company) each with a capacity of 1.6 million gallons per hour (2.02 m3/s), the total cooling capacity was 9.6 million gallons per hour (12.1 m3/s). The cooling system was designed to cool water by 12°F (6.7°C). Make up water was drawn from the adjacent canal.[5]

Commissioning

The first generating set was commissioned in July 1949; the second set in September 1949; the third in December 1949; the fourth in June 1950; the fifth in August 1954; and the final set in December 1954.[5] The final generating capability was 208 MW, and the output capacity was 195 MW. The diesel sets were commissioned in April 1955.[5] The station was officially opened on 30 September 1949 and was one of the largest and high output power plants. The station burned 'slack' coal, which consisted of fragments of coal and coal dust. Coal was delivered by road, rail and canal.

Operation

Operating data for Walsall power station for the period 1954–79 was:[5][9][11][12]

Walsall power station operating data, 1954–79
Year Running hours or load factor (per cent) Max output capacity  MW Electricity supplied GWh Thermal efficiency per cent
1954 8413 112 645.435 24.72
1955 8246 168 757.300 24.71
1956 8759 172 782.142 24.54
1957 8443 172 788.169 24.67
1958 6817 172 690.324 24.28
1961 (47.3 %) 195 807.089 24.28
1962 (40.1 %) 195 684.688 23.33
1963 (36.51 %) 195 623.690 22.79
1967 (43.5%) 195 750.014 23.43
1972 (32.5 %) 191 545.858 22.94
1979 (16.2 %) 191 270.928 19.43

The electricity output in GWh from Walsall power station is shown on the graph.[5][9][11][12]

Walsall Electricity District

Walsall was an electricity supply district covering 37 square miles (96 km2) and a population of 170,000 (1959).[5] It encompassed the County Borough of Walsall, the districts of Aldridge and Brownhill (part) and part of Cannock district. The number of consumers and electricity sold was:[5]

Year 1956 1957 1958
Number of consumers 47,367 48,896 50,705
Electricity sold MWh 214,398 230,715 243,328

Decommissioning

Walsall power station was decommissioned on 1 March 1982[13] after 33 years in use, and the stub of railway serving it west of Ryecroft Junction, was closed at the same time. The power station was closed as it was no longer deemed to be efficient, when much newer coal power stations built later in the 1960s, 1970s and 1980s with six or eight cooling towers can generate up to ten times more electricity as technology improves with bigger generators becoming more apparent on less coal consumption i.e. 2000 MW+ than Birchills could.

It was disused for nearly five years, finally being demolished in March 1987.

The substation it fed power to, also in Birchills is still in existence today, but is now fed from Rugeley 'B' station.

References
  1. Garcke, Emile (1898). Manual of Electrical Undertakings 1898-99 vol. 3. London: P. S. King and Son. pp. 331–333.
  2. "Electricity generating stations for public supply in the West Midlands 1888–1977" (PDF). outsideecho. 1977. Retrieved 22 October 2020.
  3. Some sources eg. Garrett 1959, give the rating as 6.25 MW
  4. Electricity Commission (1925). Electricity Supply - 1920-1923. London: HMSO. pp. 94–97, 326–31.
  5. Garrett, Frederick C. (ed) (1959). Garcke's Manual of Electricity Supply vol. 56 1958-59. London: Electrical Press. pp. A-33, A-113.CS1 maint: extra text: authors list (link)
  6. Shill (2011)
  7. Electricity Council (1987). Electricity Supply in the United Kingdom: a chronology. London: Electricity Council. ISBN 085188105X.
  8. Electricity Commissioners (1936). Sixteenth Annual Report 1935/6. London: HMSO. p. 141.
  9. CEGB, Annual report and accounts, 1961, 1962 & 1963
  10. Electricity Commission, Generation of Electricity in Great Britain year ended 31st December 1946. London: HMSO, 1947.
  11. Central Electricity Generating Board (1972). CEGB Statistical Yearbook 1972. London: CEGB. p. 13.
  12. CEGB (1979). CEGB Statistical Yearbook 1978-9. London: CEGB. p. 7. ISBN 0902543598.
  13. House of Commons Written Answers Coal-fired power stations,16 January 1984

Bibliography
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