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25
ZEB
annual report 2015
up to 181,497 kWh (35.04 kWh/m
2
), while
the predicted first year use was 174,859 kWh
(33.76 kWh/m
2
).
In addition, the buildings are equipped with a
data centre. Total energy use for the computer
servers in the centre during the first year of
operation was 40,836 kWh (7.88 kWh/m
2
).
Thus, the total measured first year energy
use was 222.333 kWh (42.93 kWh/m
2
).
This implies a reduction of approximately
82.5 % compared to the yearly use before
refurbishment, typically measured to around
1,270,000 kWh (245.00 kWh/m
2
).
The roof mounted PV system produced
223,119 kWh the first year of full operation,
while the predicted first year production was
227,782 kWh.
Powerhouse Kjørbo is the first building in
Norway to achieve BREEAM outstanding,
and user surveys based on the first year of
operation show that more than 87.5 % of
the users were satisfied with the thermal
environment, while more than 95 % were
satisfied with the perceived indoor air quality
3
.
In addition, all parties in the Powerhouse
Collaboration have achieved their profitability
requirements.
Even though Powerhouse Kjørbo is only at the
start of its expected 60 year lifetime, operation
is on track, and all objectives in the project
seem to be within reach. This implies that
Powerhouse Kjørbo probably is the the first
profitable, energy-positive building ever built
in Norway.
Spiral staircase - Powerhouse Kjørbo. Photo: Anne Gunnarshaug Lien