Probably not an accident; see Kim. Data Center Cooling Water Discharge: Assessing Environmental Transparency and Information Gaps, 32 Hastings Envt'l L.J. 177 (2026)

But the work is out there, for instance Miara et al. Thermal pollution impacts on rivers and power supply in the Mississippi River watershed, Environ. Res. Lett. 13 034033 (2018)

Worthington et al. The effects of a thermal discharge on the macroinvertebrate community of a large British river: implications for climate change. Hydrobiologia 753, 81–95 (2015)

Lukšienė, Sandström, Lounasheimo, and Andersson. The effects of thermal effluent exposure on the gametogenesis of female fish. Journal of Fish Biology, 56: 37-50 (2000)

Penk and Williams. Thermal Effluents from Power Plants Boost Performance of the Invasive Clam Corbicula Fluminea in Ireland's Largest River. Science of The Total Environment, vol. 693 (2019)