Assessing Nuclear Plant Capital Costs for the Two Proposed NRG Reactors at the South Texas Project Site
Arjun Makhijani, Ph.D.1
March 24, 2008
A. Main Findings and Recommendations
NRG, a merchant electricity generating company, proposes to build two new nuclear power
reactors, totaling 2,700 megawatts at the South Texas Project site near Bay City, Texas. NRG
owns a part of the two units that already exist at that site. CPS Energy, San Antonio’s electricity
and gas municipal utility, which owns a 40 percent share of the two existing units proposes to
purchase a 40 percent share of the proposed new reactors. This analysis is a preliminary report
on the likely capital costs of the two reactors, as best they can be determined at the present time.
It also contains some preliminary observations regarding efficiency and distributed renewable
energy sources to put the CPS decision that might be made regarding investment in the NRG
plant into context.
Central conclusion and recommendation
The overall finding of this report is that NRG’s range of $6 billion to $7 billion is obsolete.
The best available estimates indicate that capital costs would likely be about a factor of two
or more higher, even without taking into account the potential for real cost escalations
during construction, delays, and other risks. The risks to CPS, as a municipal utility and to
its ratepayers as well as to the taxpayers of San Antonio are great. Due diligence demands
that CPS participation in the project should not be pursued until an independent, detailed
study with current cost estimates of the plants and alternatives to it are complete and have
been publicly disclosed and discussed.
1 Arjun Makhijani is president of the Institute for Energy and Environmental Research, and Fellow of the American
Physical Society.