The firm sparked concern among Islanders and holidaymakers when it poured green dye into the sea on Tuesday afternoon to monitor the outflow from its power plant.
Several Islanders phoned the JEP believing there had been a pollution spill in the area, which has been designated a specially protected Ramsar site because of its ecological importance.
And a number of people swimming in Havre des Pas reportedly left the sea as the dye spread.
But the firm yesterday moved to reassure Islanders that the dye was harmless, and said that the Environment department was fully aware of the test.
However, in a short statement, St Helier Constable Simon Crowcroft said that he will be investigating whether an offence had been committed under the Water Pollution Law.
Full story in today’s JEP