75.5 GWh. That is how much DONG Energy needs to save on energy consumption at
our Danish power stations before 2020. It corresponds to the annual consumption
of 22,000 households. We are working intensely on achieving this target; and it
is within reach.
"The purpose of the project is energy efficiency at DONG Energy's power
stations through specific projects and an increased awareness of energy
efficiency," said Edvald Eyjolfsson, Engineer in DONG Energy.
And the specific projects are very tangible. For example, at the Avedøre
Power Station they have discovered millions in savings - in the air.
A very exciting project
Frequency converter, outgoing air
compressor, ventilation system, air pressure leak, absorber pumps. It sounds
like a technical dictionary, but actually it is only a fraction of topics
discussed at the Avedøre Power Station when they needed to find areas where they
could save money.
"We have large-scale and small-scale projects all contributing to us
achieving the target of cost savings on our own energy consumption. One of the
large-scale and exciting project is that we save money on air," said Jens Lebech
Kaagaard, Maintenance Manager at the Avedøre Power Station and project manager
on the energy savings project at the power station.
"It's a bit technical, but we can save a lot of air by replacing the old
positioners. A positioner regulates the control airflow into the valve. The new
model uses 90% less air than the ones installed today. This will result in
annual cost savings of 3.45GWh - corresponding to the annual consumption of
1,000 Danish households.
Millions of Danish kroner
At the Avedøre Power Station,
DONG Energy will replace 106 positioners at a cost of slightly more than DKK 1.5
million. The investment is expected to be recovered in one year and three
"And considering that these positioners will potentially last for ten years,
we're talking about significant savings; actually millions in savings. And this
is only at the Avedøre Power Station. We will now begin calculating how much we
can save if the other power stations are able to make the same investment," said
Jens Lebech Kaagaard.
"Furthermore, we've installed air meters to verify that we actually achieve
the savings we hope to achieve. The above estimated savings are based on the
calculations of the supplier, and we want to check that these are accurate
before we continue investing in additional replacements," he said.
Energy advisers from DONG Energy as well as external consultants have helped
the power stations find and analyse the energy-saving initiatives. After
completing the analyses, the power stations will be responsible for implementing
the projects which make sense.