Generating CMUs that use the transmission network only have the option of a 'firm' connection to the network. New users of the distribution network can opt for an interruptible connection- they are not then required to pay for the necessary upgrades to the network to ensure they can export power. This allows multiple embedded CMUs to connect onto the same part of the distribution network even where there is not the infrastructure to allow them all to generate simultaneously.
The lack of firm connection may affect the ability of a distribution connected CMU to deliver its capacity obligation in a system stress event. This proposal would require a Distribution Connection Agreement for a New Build Generating CMU to be firm, where 'firm' means a connection that is not part of a scheme that could result in curtailment of access when the connection to the network is intact and operating normally.