Ofgem has approved the modification of the code that alerts operators the energy system needs more generation to come forward during peak demand.
It follows a suggestion by National Grid to change the current Notice of Inadequate System Margin (NISM) to Electricity Margin Notice (EMN).
A NISM is a message to market participants to provide more power or reduce demand when needed and does not reflect an imminent power shortage, according to the grid operator.
It added the new code will provide clarity around the hierarchy and protocols of system notices for winter 2016/17 and onwards as well as reduce the likelihood of misinterpretation.
Ofgem has approved the modification because it believes the EMN will allow the development, maintenance and operation of an efficient, co-ordinated and economical system for the transmission of electricity and facilitate competition in generation and supply of power.
It added the new code will promote the security and efficiency of the electricity generation, transmission and distribution systems.