The coal allocation scam involved the inefficient allocation of India's coal deposits to public and private companies by the government between 2004-2009. Around 194 coal blocks were allocated without an open auction process, resulting in potential losses of over $33 billion to the Indian exchequer. Key individuals implicated included former Prime Minister Manmohan Singh. In 2014, the Supreme Court ruled the allocations illegal and ordered a CBI investigation and fresh auction of 204 coal blocks. The scam is also known as "Coalgate" by analogy to the Watergate scandal.