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I guess you missed this part. Reading comprehension is a basic life skill.

“A COP26 spokesperson has confirmed that the substitute generators may have to run on hydrogenated vegetable oil – recycled cooking oil – derived from waste products. “

Waste cooking oils are destined for one of three places. The sewage treatment plant where they cause a whole host of issues none of them positive. The landfill where they also cause issues and create large amounts of landfill gasses that must be vented ,flared or captured and cleaned up to release. The third option is to hydrogenate them to make them less viscous so any diesel engine can then burn them at high efficiency.

EVs have a plug to wheel efficiency in the 96% range which has been scientifically proven on a number of EVs that means 96% of the energy put into an EV ends up driving it down thw road. A modern diesel generator run at its peak efficiency point which is 75% to 80% of peak rated power is 44_50% eff. 50% x 96% = 48%

For a diesel ICE powered car while yes at peak efficiency it will also have the same 48_50% eff this peak power operating point is also at 70 to 80% of rated power which is used under 1% of the time in normal city driving and even less on the highway. If the ICE vehicle has a 200 to diesel that means it’s peak efficiency point is 140 to 160 hp it only takes less than 25 to to.drive a full sized sedan down the motorway. Diesel in ICE powered car running at 25hp on a 200hp rated engine is under 25% tank to wheel efficiency this also has been proven many times via science goggle scholar is full of ASE studies should one look for them.

While it seems counter intuitive it is scientifically proven more efficient to run a stationary generator at its peak efficiency point to charge a second law of thermodynamics electric vehicle and then run that on the road. Second law machines will ALWAYS be fire efficient that first law combustion physics governs that outcome and second law electrics are always going to be 98% efficient in converting electrons to movement and first law will never EVER get over 70% one hundred years of refinement has yielded 50% and that’s at the ragged edge of what is possible with the modern diesel coming in at that 50% Mark after a hundred years of refinement.

So yes it makes perfect sense to take a waste product and use it to run a modern generator at its peak point to charge a second law electric. The EV will take up too a 250 or 300 kw charge rate off a generator which for a 250 kw generator it’s peak efficiency point would be 175kw a modern EV will easily take a 175kw charge rate. If the generator is a one megawatt unit then bring in three EVs and charge all three at that generators peak efficiency point. This transition is inevitable electrics are superior in everyway to an ICE powered car once battery tech reaches 3000 charge cycles, $75 per kWh and 15 year calender life the cost of ownership is lower than an equally powered ICE powered car. Carla hit those numbers last year btw.

You will never have an oil well with a three phase oil gas water separator, plus a fractionation tower plus hydrocracker to produce octane in your back yard. You can have 10kw worth of Silicon panels on your roof that in a single 8 hour sunny day will charge your EV from zero to 100% with power left over for your house. Those panels will make 400 plus miles of EV range every day there is sun and in Dallas that’s 220 days per year. 400x220=88,000 miles the average yearly mileage in America is 12500 per person.