Energy Transition in Metropolises, Rural Areas, and Deserts. Louis Boisgibault
The word energy comes from the ancient Greek, energia, the force in action. The dictionary characterizes it as a physical system, keeping the same value during all internal transformations of the system (conservation law) and expressing its ability to modify the state of other systems with which it interacts. The units used in the international energy system are the joule (J), the Watt-hour (Wh) and the ton of oil equivalent (TOE) due to the economic and political significance of oil.
Energy sources can come from raw materials (Vidal 2017) such as hydrocarbons (crude oil, natural gas and coal), uranium or natural phenomena such as wind, sun, hot springs, organic matter fermentation, tides and marine currents. These sources can be primary, i.e. directly from nature such as wood, hydrocarbons, uranium, organic waste or secondary, i.e. from human transformation such as electricity and gasoline. The energies used by mankind have evolved over the centuries in different transitions due to the discovery of new raw materials, the domestication of natural phenomena and technological progress. The final energy is that which is delivered to and consumed and paid for by the inhabitant.
Why are these definitions already an issue? Because it is necessary to count energy to see the evolution of production and consumption in metropolitan areas, rural areas and deserts. Energy metering is always tedious, but it is essential to establish a diagnosis that then makes it possible to prepare an action plan, with more or less significant investments. We are confronted with the difficulty of knowing whether we are thinking in terms of primary energy or final energy and how to compare 1 liter of fuel oil with 1 kWh of wind energy. Statistics have been compiled in TOE since 1972. In France, for electricity, 1 MWh was equivalent to 0.222 TOE, which corresponded to an average efficiency of 38.7% for a thermal power plant (43.7% – 5% loss during distribution). This affects a primary energy conversion factor of 2.58 (1/0.387) per kWh in the energy balances.
The first problem is that thermal power plants have lost market share to nuclear and renewable energies since 1972 and that the nuclear power plant has a better load factor than the photovoltaic plant. The load factor is the operating factor of a power plant. It is the ratio between the electrical energy actually produced over a given period and the energy it would have produced if it had operated at its maximum power during the same period. However, the photovoltaic plant does not produce at night. The International Energy Agency standardized the conversion by specifying that nuclear MWh was equivalent to 0.2606 TOE and renewable MWh was equivalent to 0.086 TOE in primary energy balances.
The second problem is that fossil fuels do not undergo any increase in coefficient. If a thermal regulation requires each new dwelling built to consume less than 50 kWh of primary energy per square meter per year, this implies that the electrical dwelling will be penalized by this coefficient compared to the fossil dwelling, whereas it emits less than CO2/m2/year.
The question today is whether primary energy is an appropriate criterion for regulating energy use and which primary energy conversion coefficient to use. The final energy makes it possible to link regulation with bills the consumer receives.
The energy transition is not new in itself. It is considered to reflect the gradual abandonment of some energies in conjunction with the development of others. One might think that this is due to the arrival of new energies driven by innovation. In fact, wind, water and sun energies have always existed. Humanity has experienced various energy transitions. First, the domestication of fire by prehistoric man, 70,000 years ago in Africa, made it possible to control heat. The creation of tools, in the Bronze Age, may have been facilitated by this heat, which is a transition. Since the Middle Ages, Europeans have built windmills, river water mills and tidal mills (Woessner 2014) along the Atlantic coast, the English Channel and the North Sea. There are examples of these mills, which use the tides to operate, on Île de Bréhat, Île Arz, Arzon, Trégastel and Pont-Aven in France but also in Portugal, Spain, the United Kingdom and Belgium.
For hydrocarbons, coal mining took on an industrial dimension in the 18th Century. The invention of the steam engine by the Scotsman James Watt, before the French Revolution, was a major event since an external combustion engine transformed the thermal energy of the water vapor produced by a boiler into mechanical energy. This allowed a revolution with the arrival of the steam locomotive and a new energy transition. In 1859, when Colonel Edwin Drake first operated an oil well in Titusville, Pennsylvania, and 20 years later Thomas Edison invented the electric light bulb, one of the most important energy transitions occurred as oil and electricity replaced existing fuels. At the beginning of the 20th Century, electricity and city gas arrived in homes, which was another important energy transition, replacing the kerosene lamp, coal stove and wood fire.
Coal mining was the driving force behind the industrial revolution of the 19th Century. Its extraction, through underground or open-air galleries, is an essential economic activity that has marked the history of the research field in the north of France chosen for this project, but also the European Union and the world in general. Several techniques are used. The room and pillar method consists of manually digging, consolidating the coal vein and its ceiling by installing pillars that form underground chambers and galleries. The long method consists of drilling the coal vein with a cutting machine and recovering the ore by letting the ceiling collapse. The coal is then brought to the surface, once by humans or animals, then by conveyors and wagons, to be treated by immersing it in an appropriate liquid. Opencast mining is more profitable and is carried out using giant excavators. The treated coal is then transported to the consumption sites by road or ship.
Oil and gas exploration and production were later carried out in the 20th Century. The discovery and exploitation of deposits has created a value chain from upstream to downstream. The crude oil and natural gas extracted only make sense if they are properly processed and transported to consumption areas. A disconnection took place between production areas (desert areas, rural areas in emerging countries, offshore) and consumer areas (metropolitan areas and rurality in developed countries) and major battles have been fought for access to springs (Chevalier 2004). The research sites in Saudi Arabia selected for this project have been disrupted by this industry.
The downstream oil sector includes oil refining, i.e. the transformation of crude oil from offshore fields into finished products (such as gasoline, diesel, fuel oil and bitumen) and distribution. Distribution consists of storing finished products, transporting them and organizing marketing to the end customer. Generally speaking, crude oil is transported by ship or pipeline from the production sites to the refineries. The pipeline requires significant infrastructure investment. Its destination cannot be changed once the construction is completed.
For natural gas, the logic is similar to the processing of extracted natural gas and its transport. Its transport is more difficult than oil. It is carried out in gaseous form by gas pipelines and in liquid form by LNG carriers. The majors were less interested in natural gas fields because molecules were less profitable to transport, especially when the field was small. The plants, located near the extraction sites, were built to liquefy natural gas at –160°C so that it would lose 600 times its volume. Liquefied natural gas (LNG) is loaded onto the LNG carriers and transported to other plants, which regasify and odorize it so that it can be injected into the transmission and distribution networks.
The civil nuclear sector has developed well since the 1970s. Its value chain extends from uranium mining and transportation, particularly from Niger, to the construction of nuclear power plants, the manufacture and reprocessing of fuel and the conditioning of radioactive waste. The European and Saudi Arabian research sites selected for the book are heavily impacted by this sector, with the commissioning of reactors in northern France in the 1980s and the construction of new reactors in Saudi Arabia, i.e. with a 40-year delay.
Everyone is aware of the crucial importance of innovation in the energy sector and in the energy transition. How do new technologies, including nanotechnologies, biotechnologies, information technology and cognitive science (NBIC), affect the energy transition? How can we preserve the planet’s non-renewable stocks of hydrocarbons and uranium by better exploiting the flows of sun, wind, rivers, tides, currents and waste?
Nanotechnologies focus on objects at the molecular