What impact does the power outage have on Shoba and Shukumar’s relationship?

In A Temporary Matter, an electrical outage forces married couple Shoba and Shukumar to confront their unspoken pain over the loss of a child. The darkness gives them a safe space to confess secrets. Shoba and Shukumar admit minor indiscretions in the beginning and lead up to nagging doubts about their marriage. In the end, Shoba admits she is moving out and Shukumar admits to holding his son after he died.