Share the sun

Everyday we read about advances being made in the field of renewable energy, in terms of both technology and commercial viability, so much so that it is seriously disappointing to also read that so many people in the developed world still rely heavily on fossil fuels, not to mention nuclear power, whose increasing acceptance as a solution to global warming by parties that used to dismiss it demands more scrutiny. The gripes against renewables remain much the same as they’ve ever been: limited access due to natural phenomena, poor infrastructure, corporate laziness and/or impacted interests.
In the end, the problems facing renewables come down mainly to availability and their relationship to what we’ve come to call the grid. The utopian ideal for residences is for every home or apartment building to have its own solar system that would be supplemented by storage batteries or connections to the grid that itself would be powered by renewable energy sources, and a new community in Saitama Prefecture has come about as close to this ideal as we’ve yet seen in Japan.
An article in the Nov. 26 Tokyo Shimbun describes an experimental community in Midori Ward, Saitama City, which is being managed by the “new” energy company Looop. At present, the housing development contains 51 tightly packed single-family homes, each with its own rooftop solar system connected to a grid that serves only this community. The first thing that struck me upon reading the article was that Looop sees it as a profit-making endeavor. The residents do not get free electricity the way many homeowners with unique solar systems do. They pay Looop for the energy they need.
Consequently, the advantage, at least economically, isn’t immediately apparent, so Tokyo Shimbun gives an example of how one household uses the system. A 35-year-old man, husband and father, gets up in the morning and takes his three kids to daycare and school. He then returns home and rinses the breakfast dishes, after which he asks the AI service Alexa to boot up the special tablet and access the power table, which predicts, based on weather forecasts, the day’s solar energy collection potential and displays the resulting usage in units of ¥5 per hour. The minimum cost of the electricity is ¥20 for 1 kw/hour. He then consults the graph to decide when is the best time to run the dishwasher, the appliance that uses the most energy.
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