SINGAPORE — In their quest for energy security, Indonesia and the Philippines are planning to develop nuclear power to buttress a key part of their electricity generating systems. This provides the near constant, or base load, electricity needed by industries and households. However, the possibility of accidents and deadly radioactive releases from nuclear power plants — particularly those in countries like the Indonesia and the Philippines, which are peppered with active volcanoes and subject to earthquakes and tsunami — worries neighboring nations in Southeast Asia as well as Australia.

Such plants would be sited on coastlines so they can draw water from the sea for cooling purposes. The problems even Japan, with its advanced technology and management skills, has encountered with the seismic safety of its nuclear power industry during major earthquakes in recent years has heightened this anxiety.

Yet the very basis for these safety concerns in Southeast Asia points to a solution. Instead of going nuclear with its risks, Indonesia and the Philippines could expand what they are already doing: tapping the virtually limitless heat from deep underground to power their economies. The two Southeast Asian countries are the world's biggest geothermal electricity producers, after the United States.