Several energy companies were established over the following twenty years, each capable of producing enough electricity to power only a few city blocks.

[1] Helsingin kaupungin sähkölaitos (electricity works of the City of Helsinki) was established in 1909.

[1] During this period a large power plant was constructed in the Suvilahti neighborhood of Sörnäinen in Helsinki.

In 1977 the company was merged with the coal gas-producing Helsingin kaupungin kaasulaitos (gas works of the City of Helsinki).

[3] Helsingin Energia is the biggest company in Finland to sell district heating.