An announcement, better late than ever:
Aito, and most of its affiliates, has tossed Helsingin Energia into the trash bin (except for the monopolized transfer part) and has a new electricity provider: Ekosähkö Oy http://www.taustavoimaa.fi/ekosahko/.
Ekosähkö produces electricity through small power plants and at least one third third is produced by wind power. We made the contract here (keep the suggested parameters unchanged, consumption of energy for an one-two person household is 2000 kWh/year) http://www.taustavoimaa.fi/ekosahko/laskuri/ekosahko/index.asp
We will see in some time how it works. :)