Construction of unit 3 of Brazil’s Angra nuclear plant may be delayed after engineering companies Odebrecht, Camargo Correa, Andrade Gutierrez and Queiroz GalvĂ£o announced they were no longer going to participate in the project. The four companies are being investigated for bribes in the OperaĂ§Ă£o Lava Jato (Operation Carwash). Angra 3, scheduled to go into operation in 2018, is being built next to Angra 1 and 2, already in operation.

The companies said they were no longer going to participate in construction of the reactor, citing the non-payment by nuclear utility Eletronuclear, a subsidiary of state-owned Eletrobras. Earlier this month Eletronuclear’s president, Othon Luiz Pinheiro da Silva, was arrested after federal prosecutors working on the Lava Jato operation accused him of receiving over $1.3m in bribes related to Angra 3 contracts.

The project for Angra 3 was launched in the 1980s, but construction only started in 2010. Angra 3 is expected to generate more than 12TWh a year when it is fully operational. By March 2015 approximately U$1.3bn of the $4.2bn allocated for the project had already been used, according to Eletronuclear. The nuclear utility estimates losses of $1.7m a day if the reactor is not operational by the end of 2018.