This video explains how all electric cars can be powered from clean renewable energy sources. In fact not just electric cars - all our energy needs for the whole world could come from clean renewable energy sources.
Clean renewable energy will be cheaper, create more jobs, and of course cleaner - which means a much healthier population.

Solar and wind are both intermittent sources of energy, but over a larger region the wind is usually blowing somewhere, and an electrical grid system is an efficient way of sending the energy from where the wind is blowing to where the energy is needed. In the northern hemisphere electrical energy from solar can be sent north in the winter via the electrical grid. It can also be sent east or west from regions with surplus to regions that need to cope with peak demand.


Balancing electrical supply and demand by transmitting it through the electrical grid is much more efficient than attempting to store it and use it where it is generated. However any surplus energy should always be used – to run processes that can be run intermittently, to be stored in some form for later use, by generating hydrogen, or even if that is simply to heat up the ground or water tanks used by ground sourced heat pumps when heating is required.




The team based at Stanford University have calculated what might be the most efficient combination of clean and sustainable energy sources to ensure a reliable and stable electricity supply all year round, to supply the energy we need for all purposes by 2050.

They have also calculated how much electrical energy we will need to generate using these clean renewable systems.


The figures shown in these charts are from the spreadsheets provided by the team at Stanford University.

You can pause the video in order to study the charts, or you can download the spreadsheets themselves to see the detailed data.



For the USA: the pie chart shows the different proportions of the main clean and renewable energy sources for the most cost effective supply of energy for all purposes from clean and renewable sources.

The total capacity, in mega Watts, for each type of system that needs to be built in order to allow for the intermittent generation that results from variable weather systems. Wind energy could provide half of the energy requirements for the US.
Solar power could provide vastly more energy than the US needs, but only in the day time.

The total capacity that we need in 2050 is quite a small proportion of the clean renewable energy systems that we could build. Clean and renewable energy need not be in short supply. Note the need to store heat energy for balancing load on the grid.

The potential power that could be delivered is huge!


But the actual power that needs to be delivered to the end users is much less.


And the bar chart shows how much energy needs to be generated by each system.

For Canada onshore wind and hydro electric can provide the biggest share of electricity

Canada also has scope to generate large amounts of electricity from solar, but wind and hydro dominate in the winter. Hydro provides peak loads and stabilises the grid.

For Mexico onshore wind is the most useful source of energy in spite of the huge amounts of solar energy that could be harvested

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In Europe, for the UK, again wind is the most cost effective source of energy followed by solar panels. And offshore wind could provide far more power than the country needs. Grid stability is ensured by a balance of wind and solar energy.


for France again most energy should come from wind power, with solar panels next. Solar has the potential to provide much greater amounts of energy, but it would need to be stored.

for Germany a slightly larger proportion needs to come from wind, as winter nights become a problem if too much is invested in solar panels.

for Norway hydroelectric power could be the main source of energy, with wind power making up most of the rest. Norway has the potential to capture far more offshore wind power than is actually needed.


Australia needs to use a variety of clean energy sources in order to balance the grid, in spite of the huge potential for capturing solar energy.


New Zealand also needs a balanced portfolio of energy sources in order to balance the grid. With wind and solar providing the largest contributions.

China needs a similar balance of wind and solar, in spite of the huge capacity to capture solar energy.

for Japan again we see that a balanced portfolio of energy sources is needed with wind and solar between them providing most of the energy needed

Thailand is not a windy country, but offshore wind can still make an important contribution to stability of supply. It has the capacity to capture far more energy from solar than it needs, but would need to store energy for night time use for heating and cooling. As well as night time electrical supply


References:
https://www.cell.com/one-earth/fullte...