spot prices may not exceed a cap of aud per mwh as can be seen very high prices are rare with prices sitting within the range of aud for around of the time flowever views differ on the adequacy of high but capped wholesales prices as a sufficient incentive to invest in marginal supply reducing carbon emissions associated with power generation is a central challenge in the project to reduce overall emissions from human activity this is the case not only because stationary energy currently accounts for of global energyrelated c emissions but also because reducing emissions from sources such as the transport sector will involve further electrification since many of the most promising lowcarbon energy technologies are those that produce electricity wind and solar being two examples