Walsum power plant


1 coal - fired Benson boiler - dry ashing ( 1,206 t / h) & 2 oil - fired auxiliary boiler (40 MW)

The Walsum power plant is a coal-fired power plant in Duisburg- Walsum is situated directly on the Rhine and on the site of the former Zeche Walsum.

  • 2.1 power plant units and total power
  • 2.2 Impact of the new building (block 10) on the environment
  • 2.3 Performance (Table ) of the individual power plant units
  • 2.4 Power production and coal consumption


Blocks 6-9

In Duisburg -Walsum a power plant to meet the needs of the Zeche Walsum 1928 built on steam. In 1957 it was expanded to a power block ( block 6) with 68 MW, 1959 and 1960 was followed by two power plant units (Block 7 and 8) with 150 MW ( 129 MW net electrical power).

1988 replaced block 9 with a gross electrical output of 410 MW ( 370 MW net power) and a district heating capacity of 295 MW blocks 6 and 8

Block 7 is also out of service ( cold reserve ), however, could theoretically go within a lead time of six months in operation. Because of its age (built in 1959) and the consequent poor efficiency of a restart is very unlikely and would result in high operating costs.

Block 10

With the construction of the block 10 was started in 2007; originally planned for early 2010 start-up was delayed due to leaking approximately 3,000 welds. The trial operation had to be interrupted in May 2011 due to renewed leaks in the evaporator part of the boiler. Welding problems with a new process developed for higher pressures and temperatures, low alloy steel of the material 7CrMoVTiB10 -10 with the factory designation T24, made ​​a replacement necessary due to proven steels such as the X20CrMoV12 -1.

On April 6, 2013, the boiler was fired up for the first time after the rebuild. In this case, only oil was burned. On April 18, 2013 followed by the first burning of coal, for safe operation had initially but still additional fuel oil are burned.

Since 24 April 2013, the system runs exclusively with coal. First, the new block 10 with a maximum of 60 percent power was used, but no current was produced. On June 10, the first generation was carried out with a capacity of 175 MW, which was fed into the grid. In the following months, the power was gradually ramped up. On July 4, the system reached for the first time 100 % load ( up to 800 MW under overload ).

The new steam turbine was not allowed to be used for electricity production, first, because the manufacturer Hitachi in Japan had difficulties with other turbines of this type and assumed similar problems for the plant in Walsum and therefore gave no permission for use. Then the green light from Hitachi was issued in June 2013. Commercial operation began in December 2013.

The Lower Austrian energy company EVN, which holds 49 % shares in the power plant, announced a civil action because of the damage it has suffered due to the delayed start-up. The alleged loss amount should be 600 million euros.


Power plant units and total power

Steag operating at the location Walsum power plant blocks 7, 9 and 10 with a total output of 1,310 MW gross ( 1,199 MW net ).

Block 7 is not active as a reserve power plant for several years in cold reserve, thus the electrical installed capacity actually available of the two active blocks is 9 and 10 together 1,160 MW gross (1,070 MW net ).

Since block 7 was turned off and placed in cold reserve only produces district heating block 9. Only block 10 produces electricity without using the residual heat for district heating.

The chimney for the old blocks 7 ( cold reserve ) and 9 is 300 meters one of the tallest chimneys in Germany.

The chimney for block 10 is integrated in the 181 -meter high cooling tower ( clean gas introduction). Only due to the gas being exhausted through the cooling tower such a large cooling tower was built. The technical solution with a lower cooling tower without exhaust gas introduction and integration of new building block 10 to the existing chimney was rejected by the operator Steag.

Impact of the new building (block 10) on the environment

The new Block 10 (begun 2007), the boiler was fired up for the first time after the conversion according to various technical problems and delays in April 2013. Since the block is running in test mode. In normal operation, a gross capacity of 750 MW electric ( net capacity 700 MW electric) is sought.

The exhaust gases are on the 181 meter high - derived natural draft wet cooling tower with the damage caused by the cooling steam clouds together - only for block 10 newly built.

So far, no cooling tower was required at the site for the operation of the old power plant units, the cooling of the old power plant units was realized by once-through cooling.

With the commissioning of block 10 and the cooling tower with combined use as a chimney it is expected at this location through the tower and the costs entailed in operating steam clouds to undesirable effects on the microclimate, for example, locally increased precipitation and large-scale shading, come.

For cost reasons, the operator Steag has decided against the construction of a hybrid cooling tower, in addition to the much lower level - could also significantly produces less steam clouds - about 1/ 3 (60 meters).

Performance (Table ) of the individual power plant units

Power station




Canceled shut down &

Canceled shut down &

Canceled shut down &

Canceled shut down &

Canceled shut down &

= 32.4 %

= 37.8 %

= 45.2%

Canceled shut down &

= 25.1%

= 30.1%

(planned 200-300 MW)

Canceled shut down &

Generation of process steam

Generation of process steam

Canceled shut down &

Production of district heating

Canceled shut down &

= 37.2%

= 20.4%

= 51.6 %

Canceled shut down &

= 42.5%

= 24.5%

= 54.8 %

Electricity production and coal consumption

The power plant (only block 9 ) provides in addition to electricity for the local power grid and process steam for the adjacent paper mill Norske Skog, flue gas, electricity, process steam, compressed air and water for the PCC plant the Specialty Minerals GmbH and district heat for the district heating network Niederrhein and - up to its closure in 2008 - even electricity, heat, water and compressed air for the mine Walsum.

In addition to usable electricity production ( 2260 GWh) produced 33 GWh of district heat, 500,000 tonnes of process steam and 250 million m3 of compressed air ( in 2007). With the closure of the adjacent coal mine in 2008, much of the compressed air produced earlier is now no longer needed on site. In addition, the bill Walsum missing as a former major buyer of the electricity produced. Also, because of changed conditions on the electricity market was the amount of electricity produced 2,260 GWh in 2007, back to first 2,014 GWh in 2008. In 2011, the electricity production significantly reduced again to 1,331 GWh.

With an annual electricity production (2007) of approximately 2,260 GWh only the only active power block consumes 9 (without building block 10 and disconnected without cold reserve block 7) approximately 900,000 tonnes of coal per year.

Thus, for block 9 ( in 2007) a theoretical consumption of 398.23 tons of coal per GWh.

The coal storage building on the site has a capacity of 34,000 tonnes of coal. Kohleantransport and ash removal via the rail and over the North Walsum port. The mains connection of the power plant is made on the 220 ​​- kV high- voltage level in the network of the transmission system operator Amprion.

Operator, ownership and power options

The operator Steag is 51% owned a composite Stadtwerke ( municipal utility Rhein-Ruhr consortium consisting of Stadtwerke Bochum, Dinslaken, Dortmund, Duisburg, Essen and Oberhausen ) and 49% by Evonik Industries.

EVN AG ( power supply Lower Austria ) holds a 49% ownership interest in Block 10

Operators Steag thus has a 51% ownership stake in block 10, and is the sole owner of Altblöcke 7 and 9

Wien Energie has a current subscription rights on Block 10 in the amount of 150 MW.

EnBW ( Energie Baden- Württemberg), in addition to Wien Energie another current subscription rights on the new building block of 250 MW for a period of 20 years with option to extend.

Thus go electricity procurement rights totaling 400 MW of companies in Austria ( Wien Energie ) and southern Germany ( Energie Baden -Württemberg).


The pollutant emissions of all major coal-fired power plants are published in the European Pollutant Emission Register (via German portal Thru.de ).

Emissions below the reportable quantity threshold are listed in the table with "<" next to the limit.

- Block9 -

Block 9 -

Block 9 -