Idag hade jag ett möte med Mats Leijon, professor i elektricitetslära vid Uppsala Universitet och tillika känd för sin kompetenta forskningsgrupp kring vågenergi. Han tipsade om en mycket intressant studie som visar att de tyska satsningarna på vindkraft har lett till ökade koldioxidutsläpp.
Orsaken till detta ligger i att vindkraft är en intermittent, dvs oregelbunden, energikälla. Elnäten behöver stabilitet och därför måste man kompensera variationer i elproduktion från vindkraft med andra energikällor.
Rapporten är gjord av Renewable Energy Foundation och finns tillgänglig här.
Jag citerar ett stycke
Slutsatsen från rapporten är följande:
Så lyfter fram fram ett systemtänkande och helhetsperspektiv så blir bilden oftast en helt annan...
Orsaken till detta ligger i att vindkraft är en intermittent, dvs oregelbunden, energikälla. Elnäten behöver stabilitet och därför måste man kompensera variationer i elproduktion från vindkraft med andra energikällor.
Rapporten är gjord av Renewable Energy Foundation och finns tillgänglig här.
Jag citerar ett stycke
Citat:
The CO2 emissions reduction from renewable energy in an island power system
must be assessed on the basis on the impact that the accommodation of wind
power into the grid will have on the whole supply chain.
Electricity differs from other forms of energy, and cannot be stored directly on an industrial scale. Consequently, generation and demand have to be balanced on the grid continuously, and second by second. Policy-makers appear to have only a weak grasp of this critical fact and its implications. Indeed, the accommodation of the variable output from wind turbines into the transmission system is complex and the technical challenges are
barely understood outside professional circles.
Fossil-fuelled capacity operating as reserve and backup is required to accompany wind generation and stabilise supplies to the consumer. That capacity is placed under particular strains when working in this supporting role because it is being used to balance a reasonably predictable but fluctuating demand with a variable and largely unpredictable output from wind turbines.
Consequently, operating fossil capacity in this mode generates more CO2 per kWh generated than if operating normally. This compromising effect is very poorly understood , a fact acknowledged recently by the Council of European Energy Regulators.
must be assessed on the basis on the impact that the accommodation of wind
power into the grid will have on the whole supply chain.
Electricity differs from other forms of energy, and cannot be stored directly on an industrial scale. Consequently, generation and demand have to be balanced on the grid continuously, and second by second. Policy-makers appear to have only a weak grasp of this critical fact and its implications. Indeed, the accommodation of the variable output from wind turbines into the transmission system is complex and the technical challenges are
barely understood outside professional circles.
Fossil-fuelled capacity operating as reserve and backup is required to accompany wind generation and stabilise supplies to the consumer. That capacity is placed under particular strains when working in this supporting role because it is being used to balance a reasonably predictable but fluctuating demand with a variable and largely unpredictable output from wind turbines.
Consequently, operating fossil capacity in this mode generates more CO2 per kWh generated than if operating normally. This compromising effect is very poorly understood , a fact acknowledged recently by the Council of European Energy Regulators.
Slutsatsen från rapporten är följande:
Citat:
In conclusion, it seems reasonable to ask why wind-power is the beneficiary of such extensive support if it not only fails to achieve the CO2 reductions required, but also causes cost increases in back-up, maintenance and transmission, while at the same time discouraging investment in clean, firm generation.
Så lyfter fram fram ett systemtänkande och helhetsperspektiv så blir bilden oftast en helt annan...
