Antinuclear

One way to answer the question is to Google it. A recent search pulled up this edited Best Answer from Yahoo:     Japan thinks it can make a thorium prototype reactor for $300 million. The UK estimates that the first thorium production plant would cost £1 billion. France has invested € 1 million investigating corrosion problems found when a test reactor in the U.S. was shut down in 1969 after four years of operation. Generally, it’s believed that $300 million would be enough for small thorium power plant.

We assume a small plant means about 200 MW.

Another way to get a handle on thorium-reactor costs would be to examine the cost of conventional reactors , such as the Vogtle units in Georgia….

The first two units are rated for a total of 2,400 MW. That is a large plant.

But during Vogtle’s construction, capital investment jumped from an estimated $660 million to $8.87 billion. Additional regulations and a redesign brought the jump in capital costs.

Unfortunately, the nuclear industry has a history and habit of building plants that cost much more than their original estimates. Even though lower construction costs are claimed as a thorium-reactor benefit, when the first cost figures for one make headlines multiply them by at least five for a better estimate. But you have awhile to wait.

For at least the next 10 years, natural gas and onshore wind-generated power will provide the least expensive, most reliable, and fastest-to-production source of power. http://www.windpowerengineering.com/policy/environmental/will-thorium-power-cheap-wind-power/