"The plan to sell home data centres to customers as heat sources sounds innovative, but seems to be missing some key financial points (7th February, pg20). Each customer will need to seek the extra computing power online. The cost of a high-bandwidth connection to the internet and an intermediary to handle the processing tasks is not mentioned. More importantly, the article doesn't mention Moore's law, which states that computing power doubles every two years [Although this law isn't as straightforward nowadays with processor speed limits, it is still roughly true]. This means that the expensive kit a Project Exergy customer buys will roughly halve in value every two years. Also, companies buying the processing power will invariably switch to newer users with newer and faster kit. Early Exergy adopters will be abandoned, leaving them with nothing more than [wildly] expensive electric heaters."