Posts Tagged ‘energy’

Energy conservation isn’t just for summers any more

Wednesday, January 9th, 2013

Last summer when the antinuclear movement was receiving a lot of media coverage, the government and utilities justified their plans for reopening nuclear power plants with statistics purportedly showing how dangerously close to capacity electricity usage is in the summer, when everyone has their air conditioners on. Thanks to energy conservation efforts on everyone’s part there were no overloads, but in terms of households, reibo (cooling) only accounts for 2 percent of overall energy usage when measured in calories. Danbo (heating), on the other hand, accounts for 25 percent of home-energy usage.

Fill ‘er up: Kerosene station in Chiba

Of course, there are various methods for heating homes in Japan. In addition to electricity, there is natural gas, liquid propane gas and kerosene (toyu), but electricity has been increasing in recent decades as a means for home-heating. Between 1980 and 2005, the use of kerosene, which is utilized in space-heating “stoves,” declined from 71 to 45 percent in terms of heating needs in the Kanto area, while both natural gas and LPG increased from 21 to 35 percent and electricity from 8 to 20 percent. However, when you factor in all of a home’s energy needs — cooking, lighting, bathing, etc. — electricity accounts for 50 percent, kerosene 17 percent, natural gas 20 percent and LPG 10 percent of household energy consumption. That was for all homes in Japan in 2009. In 1973, electricity only accounted for 28 percent of overall household energy usage. So with the promotion of all-electric houses in recent years, the overall portion of home heating by electricity has probably gone up even more.

The peak period for electricity usage in the wintertime is between 5 and 6 p.m., and during the current sharp cold spell, electricity usage as reported by Tokyo Electric Power has been over 90 percent during the peak time slot. The main difference between wintertime and summertime is that power plants reduce capacity in the winter, so 90 percent represents less power usage in the winter than it does in the summer. Most air conditioners run on electricity, but as shown above heating systems use a variety of methods, so electrical usage is deemed to be less. But since electricity usage in the winter is on the increase, why aren’t power companies warning people to cut back when the usage gets close to the limit, as they did last summer?

Continue reading about wintertime energy conservation →

Breaker, breaker: How to conserve energy without thinking too much

Wednesday, July 4th, 2012

Power trip: electrical panel with 30-ampere main breaker switch

Last Monday the summer setsuden (electricity-saving) campaign started. All the regional utilities except Okinawa’s are requesting that customers cut back on their energy use so as not to put a strain on the grid, which has been compromised by the shutdown of so many nuclear power plants in the wake of last year’s meltdown at the Fukushima No. 1 reactors. As evidenced by the large anti-nuclear demonstrations taking place, a lot of people have strong feelings about atomic energy, but whether you believe it to be too dangerous to handle or an acceptable alternative to carbon-based sources, the best way to address the more pressing issue of energy shortages is to reduce usage.

Though there are many piecemeal methods for saving energy, one way to immediately cut down is to exchange your main circuit breaker, the gatekeeper for the current that flows into your home. Power is measured by means of watts, and the number printed on your breaker, which stands for amperes, represents the maximum amount of wattage that can pass into your home at one time. Different household appliances use different amounts of power. Anything that cooks or produces heat will use more power than other appliances. When the amount of power flowing into your home exceeds the ampere level of your breaker, it automatically trips, causing a blackout, but only in your home. If you use a lot of electricity, then you should install a breaker with a higher ampere number.

In Japan, household breakers come in seven steps, from 10 amperes to 60. The higher the number, the higher the basic charge on your monthly electricity bill. If you are a Tokyo Electric Power Co. customer you pay ¥273 for 10 amperes, ¥409 for 15, ¥546 for 20, ¥819 for 30, ¥1,092 for 40, ¥1,365 for 50 and ¥1,638 for 60. In order to figure out which breaker level is appropriate, take a survey of all your household appliances and how often you use each one.

Continue reading about easy energy consevation →

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