Port & Environment

Port invests in energy efficiency

In view of rising energy costs – and everything indicates that the prices will not fall – companies are well advised to explore intensively new measures which help to save energy and increase energy efficiency. The “Staatliche Rhein-Neckar-Hafengesellschaft Mannheim mbh (HGM)” has for years been successful in its search for potential energy savings. The HGM follows a dual approach: Improving existing structures and investments in new, future-oriented technologies.

Photovoltaics makes it possible

Since 2007, photovoltaic systems have been gradually installed on various warehouses of the HGM along the “Rheinkaistraße” and on the “Parkring”. The latest system went into operation at the end of 2009. The port company invested around € 3 million Euro in this project, although the total also includes maintenance, insurance and repairs (rounded up to 20 years).

With the electricity fed in from its photovoltaic systems (the annual energy generation amounts to around 660,000 kWh), the HGM has so far been able to cover about 85% of its own energy requirements, which it needs for example for street lighting, rotary cranes and gantries, the port lock, quay wall lighting, lifting equipment and railway lighting.

PV systems of the port company

Roof area m2

Installed performance kWp

Annual performance kWh

CO2 saving kg

Block III installed Dec 07

3.900

124,83

107.715,50

94.789,64

Block II installed Oct 08

3.900

130,32

116.238,99

102.290,31

Block I Installed Oct 08

3.900

128,59

120.358,00

105.915,04

Parkring 47a installed Jul 09

1.400

72,91

63.835,00

56.174,80

Parkring 49a installed Feb 09

1.400

64,53

62.219,53

54.753,19

Block IV installed Dec 09

3.000

212,00

191.757,00

168.746,16

Total

17.500

733,18

662.124,02

582.669,14

Table caption:

The electricity fed in has so far covered 84.45% of the electricity used by the HGM.

Investment in new lighting significantly reduces energy consumption

The figure is now even 100%, because the replacement of the port lighting carried out in 2010 has proven to be extremely effective. The HGM invested around € 160,000 in the improvement of the lighting situation in the port. The obsolescent mercury vapour lamps – which made up about one quarter of the street lamps in the commercial port, were replaced in early 2010 by new, modern lamps, consisting of either sodium vapour high-pressure lamps or LED lamps, depending on the height of the lamp-post.

With the new lighting, around 14% of lighting energy costs can be saved, some 25,000 kilowatt hours a year, compared to the previous situation – with the added benefits of much better light, a long service life and advantages in maintenance and cleaning. Traffic observations have also shown that the times for full-load operation can also probably be reduced further in future, which is easily possible with the ultra-modern ballast devices that have also been procured. This would enable savings of up to 30%, representing 53,000 kWh p.a.

Environmental considerations also played an important role in the investment decision with regard to energy, maintenance and servicing, in addition to cost reduction. The new lamps are not only much more economical, but are also much better sealed. The sodium vapour lamps used give off less UV radiation, while the LED lamps give off no UV radiation at all. They therefore save the useful insects which live close to the river, and attracted by the light, build their nests in the lamps.
Der vorherige Zustand......mit neuen LED-Lampen
So sah es vorher aus......und so heute