Electricity: why record stores
The figures are record: 101,700 megawatts (MW) consumed by the French at 19 o'clock last night, a record that surpasses the previous day, to 100,500 megawatts. The previous record was 15 December 2010 to 96,710 megawatts. With each new wave of cold correpond a new historic peak of consumption to meet the increased need for hot water and heating.
Why do we save these records, while 2011 saw a decrease of 6.8% of electricity consumption in France? The sensitivity of electricity consumption to cold temperatures has increased over the last decade, the order of 70 MW per year, says the electricity transmission network (RTE), a subsidiary of EDF responsible for network of power lines. In addition, our electro-climate sensitivity is higher than our neighbors to each degree less, Europeans consume more today 5000 MW, of which only 2300 MW in France! In comparison, Britain consumes 600 MW for each degree lost, Germany and Italy 500 MW 300 MW.
This explains why the French electrical consumption was so low in 2011, the warmest year since 1900. Instead, the cold snap earlier this year led to a series of daily records: the scale of temperatures, the geographic scope (on the whole territory) and the duration of this wave creates a phenomenon of "cold accumulating," said Herve Mignon, Director of Economy, Planning and transparency in TEN.
More electric heaters, more devices
The origin of this particular sensitivity to cold in France: electric heating, which team nearly a third of homes and is installed in 80% of units built in 2009, according to the Environment Agency to control Energy (ADEME). "The electric heaters (except models with heat accumulation) contributes to peak electricity consumption observed around 19h," says this on his site. "It's a French specialty, says Francoise Clement, Information Officer at ADEME. We relied on electric heating, which makes us very dependent on climate. "
Easier and cheaper to install than central heating, it is elected by overwhelming in a country where electricity is more abundant than elsewhere. However, it may prove far more expensive to use, especially since many homes are poorly insulated. "The actual search for energy savings is still new in France, Clement says Françoise. We had no temperature control before 1975 and our expertise in high performance homes is still underdeveloped. "Now, the heat losses are significant: 25% to 30% through the roof, 25% by walls and 10% to 15% by windows.
In parallel, the use of electrical appliances has been steadily improving. In the living room consoles, computers and televisions are increasingly hungry for electricity, as well as kitchen equipment, such as coffee makers and electric robots. "The spirit of cocooning" increases in household demand, explains Françoise Clemente: "We like to equip themselves, we want to be like home."
We must add that the growing electricity demand with economic growth and the continued increase in population. In its latest forecast balance, RTE still see electricity consumption to grow by 1.1% by 2015. Then, assuming an improvement in energy efficiency in buildings, consumption could increase by 0.6% per year by 2030.