September 22

Events - Science & Technology

1891day.year

The first hydropower plant of Finland is commissioned along the Tammerkoski rapids in Tampere, Pirkanmaa.

Finland's first hydropower plant began operation in 1891 at the Tammerkoski rapids in Tampere, pioneering the nation's renewable energy industry.
In September 1891, the Tammerkoski rapids in Tampere became the site of Finland's first commercial hydropower plant. Engineered by local entrepreneurs and engineers, the facility harnessed river currents to generate electricity for nearby industries. The plant supplied power to textile mills and workshops, fueling Tampere's growth as the 'Manchester of Finland.' This milestone marked a shift from steam to renewable hydroelectric power in Finnish industry. The success of the Tammerkoski plant inspired hydro projects across the country, shaping Finland's energy infrastructure. Over time, hydropower would become a cornerstone of Finland's electricity mix, driving economic development and environmental stewardship.
1891 hydropower plant Finland Tammerkoski Tampere Pirkanmaa
1976day.year

Red Dye No. 4 is banned by the US Food and Drug Administration after it is discovered that it causes tumors in the bladders of dogs.

The US FDA bans Red Dye No. 4 after animal tests reveal it causes tumors in dogs, reshaping food safety standards.
On September 22, 1976, the US Food and Drug Administration enacted a ban on the synthetic dye Red Dye No. 4. Laboratory studies showed the additive caused urinary bladder tumors in long-term dog exposures. The decision affected numerous food, beverage, and cosmetic manufacturers using the popular red coloring. It ushered in more rigorous review processes for food additives and increased public awareness of chemical safety. The ban remains a landmark in the history of consumer protection and regulatory science.
1976 Red Dye No. 4 Food and Drug Administration