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Wednesday afternoon will see the fourth vote in the European Parliament (this time again in the environment committee) on a scheme to temporarily reduce the number of allowances available to participants in the EU emissions trading system in order to stabilise dwindling allowance prices. This is referred to as “backloading”, because the 900 million allowances that would be withheld from the market in 2013-2015 would be reintroduced in 2019-2020.

Much has been written on the advantages and disadvantages of this proposal. For at Shell there are a number of reasons to vote in favour of back-loading. First, restoring the price signal will increase market confidence, necessary to improve investment decisions (eg, in carbon sequestration projects). In more political terms, the backloading decision could boost the idea of a single EU market and could promote EU leadership on carbon trading. In fact, since 2005, many countries have followed Europe's example and introduced an ETS system at home.

On the academic side, (2013) are strongly in favour of backloading as a means to tighten the demand-supply balance in the carbon market. They argue that while a modest oversupply in the system is fine as long as enough emitting companies have to buy allowances for their foreseeable needs (hedging), the price collapses when the oversupply in the system reaches a certain level. Hence, a weak form of scarcity is essential to obtain meaningful prices.

underlines that, from the UK perspective, it would be counterproductive to vote against backloading as the price disparity between the UK “Carbon Price Floor” and the EU ETS would otherwise increase to the detriment of UK electricity generators.

At the same time numerous commentators (such as ) have warned that an intervention in the market mechanism could be seen as a signal of high political volatility, scaring away investors. We have argued in an earlier blogpost (Decarbonisation is no 100 metre race) and a recent paper (You'd better bet on the ETS) that the ETS is a very efficient decarbonisation policy, but that backloading does not resolve the structural issue of the ETS – the lack of long-term credibility of the system.

But beyond arguments about whether backloading is the best tool to stabilise the ETS or not, the discussion has shifted towards whether the ETS itself is an appropriate tool for cost-effective decarbonisation, and even if we can afford decarbonisation in the current economic climate. Consequently, for many commentators, backloading is not about the demand-supply situation in the ETS but s mainly a political issue (, ). The argument is that a negative vote on backloading will demonstrate a general distrust in the ETS. Hence, the backloading decision has been turned into a symbolic choice on the future of European decarbonisation policies ().

This makes it difficult for policymakers that agree that the ETS is the appropriate tool for decarbonisation, but fear that backloading is inappropriate for improving the system.