sentences:  They are also against the police investigation into the matter, believing that the "public interest is not served by a criminal investigation to blame any individual for this tragedy", instead believing any investigation should be into the electricity companies and their practices.Mercury Energy sent a letter to its 300,000 customers on 16 June, signed by Carole Durbin, chairwoman of Mighty River Power, stating that "Mercury Energy and Mighty River Power deeply regret what occurred".The Electricity Commission (now the Electricity Authority) issued new guidelines in July 2007 stating consumers who are dependent on electricity for critical medical support should state so to their electricity retailer and are not to be disconnected for non-payment.