Spring lightning show lights up South Australian skies, causing blackouts and train delays

South Australians have snapped photos and videos of a spectacular spring lightning show.

Almost 100,000 lighting strikes put on a stunning 24-hour show, as ominous storm clouds rolled in and cast Adelaide into darkness.

Resident Stacey Jones said she "could hear the electricity flowing through it".

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"I've never heard that in my life before," Jones said.

Power was cut to 25,000 homes and businesses as bolts bore down on the Eyre and Yorke peninsulas, Adelaide and into the south-east.

Resident Ann Barblett said the whole sky "was just alight with lightning".

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"So I screamed and luckily for my housemates it was covered by the biggest clap of thunder," she said.

There were bad delays for train passenger with lightning blamed for stopping signalling systems on all Adelaide Metro lines during the morning peak.

"The thing about signalling is it's something you cant get wrong because if you get it wrong the consequences are catastrophic," Transport Minister Tom Koutsantonis said.

While Adelaide residents experienced milder conditions today, more thunderstorms are on the horizon for the city.

"There is another low and the trough moving across on Saturday," the Bureau of Meteorology's Tom Boeck said.

"So we'll see shower and thunderstorm activity again on Saturday."