This was the question posed by the author Saci Lloyd when she wrote her book "Carbon Diaries 2015" where this science fiction story was set in the UK, and every individual was put on a daily carbon diet, seen from the perspectives of a teenage girl. Saci Lloyd's books is maybe the most important book written this century so far, because it imagines what a low carbon society could look like, and still function.
It is difficult to determine exactly how much electricity a single person should consume per year in order to avert the climate catastrophe, as this will depend on a number of factors including the person's lifestyle, the efficiency of their home and appliances, and the availability of renewable energy sources. However, it is generally accepted that reducing energy consumption and transitioning to renewable energy sources are key strategies for mitigating climate change and avoiding the worst impacts of global warming.
According to the Intergovernmental Panel on Climate Change (IPCC), global greenhouse gas emissions need to be reduced by at least 45% from 2010 levels by 2030 in order to have a chance of limiting global warming to 1.5°C above pre-industrial levels, which is considered a key threshold for avoiding the worst impacts of climate change. This would require a rapid and ambitious transition to renewable energy sources and significant improvements in energy efficiency across all sectors of the economy.
In terms of the specific amount of electricity that a single person should consume per year, it is difficult to provide a precise answer, as this will depend on a variety of factors including the person's energy needs, the efficiency of their home and appliances, and the availability of renewable energy sources. However, it is generally recommended that individuals aim to reduce their energy consumption as much as possible, while also increasing the proportion of renewable energy in their energy mix. For example, a person who consumes a total of 5,000 kWh of electricity per year and uses 50% renewable energy sources could be considered to be making a significant contribution to the transition to a low-carbon energy system.