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During the scheduled blackouts that Tokyo Electric Power Co. (TEPCO) conducted soon after the Great East Japan Earthquake and tsunami, which triggered the ongoing Fukushima nuclear crisis, those within the blackout zones found they were unable to use their landline phones.

Back in the days when we used rotary landline phones, the electricity needed to power them was transmitted via telephone lines. In other words, phones didn't depend on an external power source, and could function even during power outages. However, with the increasingly common VoIP phones -- which use the Internet and are mediated by network routers set up in homes and offices -- they become useless when the power supply to those routers is cut off.

While the mammoth telephone company Nippon Telegraph and Telephone (NTT) Corp. is planning to switch over phone accounts set up during its days as the government-owned Nippon Telegraph and Telephone Public Corp. to the VoIP system, countermeasures against power outages must be taken into account.

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Meanwhile, there has been an increased buzz surrounding the possibilities of natural energy sources such as solar power and wind power since the nuclear accident at the Fukushima No. 1 Nuclear Power Plant.

Both solar power and wind power generation are dependent on the weather, making not only energy output unstable, but also electrical voltage and frequency. Because transmitting large volumes of such electricity would negatively affect the quality of the overall power supply, many say that there are limitations to both solar and wind power generation.

But the inconsistencies in the volume and quality of such natural electricity can be resolved if it is stored in rechargeable batteries at homes and businesses before use.

The quality and stability of electricity supplied in Japan outperforms that of almost any other country, and blackout rates have been extremely low. As a result, there have heretofore been very few efforts to adopt an uninterruptible power-supply (UPS) system.

In the days immediately following the earthquake, flashlights and batteries disappeared from stores in the Tokyo metropolitan area. While the stable supply of electricity is the responsibility of power companies, it is necessary for us to keep, in preparation for emergency, a reserve of electricity for basic lifelines such as telephones and light ing in our homes and places of work.

There are steps being made to accommodate this need with electric car batteries. And if large-capacity batteries in homes and businesses become more widespread, it will provide momentum for the use of solar power and other natural energy sources.

The problem, then, is cost and the stability of the batteries. Research is currently being done to test new materials for the batteries. Once they are mass produced, cost per unit is sure to go down.

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