Actually, Yucca has cost taxpayers about $3 billion so far, but the previous comment is correct that most of the costs (over $6 billion) are paid by nuclear utilities and their customers. The $3 billion represents the share of disposal costs that are attributed to disposal of government-managed nuclear waste.

Here's another TAXPAYER liability: the government has contracts with the utilities to dispose of their waste starting in 1998 and has been found to be in breach of contract, making the government liable for as much as $7 billion when/if the repository begins to accept waste. The delay has consequences and the Democratic candidates skip over that as they seek to curry favor with Nevada voters.