http://www.motiva.fi/files/2496/Renewable_Energy_in_Finland.pdf

The sun is a key resource
Utilisation of solar energy in Finland is sensible.
In these latitudes, only in the middle of the winter
is the sun so low in the sky that it provides hardly
any power for heat or electricity generation. Careful
planning and replacing the surface materials of
buildings with solar power panels or thermal collectors
may improve the overall economy of solar
energy.
Connecting solar heat to a water-circulated system
and to the heating of domestic water supply is encouraged.
Solar heat systems have been installed
especially as a source of extra heat in oil-heated
buildings.
Producing solar electricity with the current technology
is fairly expensive. Solar power may become
more popular in the future if the manufacturing
costs of solar panels can be reduced and the efficiency
rate improved. New innovations produced
by research and development work may change the
situation in favour of solar power.
Ambient heat utilised with heat pumps
Heat pumps are a noteworthy choice for the heating
of buildings. They utilise ambient heat, i.e. heat
from the ground, water or air, and therefore reduce
the need for other energy. Especially ground- and
air-source heat pumps have become more common
in new and refurbished detached houses.
Growth in the sector has been strong since 2000.
Efforts are made to increase the net energy produced
with heat pumps, regarded as renewable
energy, to 5 terawatt-hours per year by 2020.