Comment on: Ministers given zero carbon proposals
Let me explain the reasoning behind the "150%" reduction. Zero Carbon was previously defined (some would agree logically) as a house that achieved 100% carbon reductions against the design basecase. However, due to the complex way buildings operate, this only includes regulated energy consumption - lights, heat, hot water etc.
It did not include, however, what is referred to as "small power" - essentially, what is used by equipment powered by plug sockets. For example, you mobile phone, your hairdryer, your laptop. Industry research and experience suggests that small power accounts for approximately one third of total carbon emissions from residential buildings.
Hence, amending the previous definition, the revised definition requires a "150%" reduction in carbon emissions in order to be truly zero carbon.
Check out the (no doubt much more eloquent) official definition here:
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