FREQUENT power cuts in Cullera were caused by illegal electricity hook-ups by a gang running a marijuana farm network.
Suspecting that the outages were down to excess power usage, the Guardia Civil measured consumption early one morning.
Using amperage meters, they discovered 31 locations where electricity was being illegally syphoned.
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With the help of the supplier, they analysed power levels at each property in a Cullera district to determine the scale of the abuse.
An operation was launched where officers based themselves outside a number of homes to stop inhabitants escaping before they staged simultaneous raids.
Power supplies were also disconnected to avoid anybody being electrocuted.
40 people- all Spaniards- are being investigated after 100 kilos of marijuana was seized.
They face 39 counts of fraudulently obtaining electricity as well as drug trafficking.