The CEGB Cohort Study tracks a cohort of workers in the UK electricity industry (the then nationlised Central Electricity Generating Board) and looks at cause of death for any associations with occupational risk factors, including EMFs. It has now expanded to include cancer incidence as well as mortality.
The first publication on incidence finds
an excess of mesothelioma (attributed to asbestos in power stations)
no accompanying excess of lung cancer (attributed to the smoking rates being lower than the general population)
“unexceptional” results for brain cancers and leukaemia