The Balancing and Settlement Code (BSC) is a multi-party legal framework that underpins the electricity trading arrangements in Great Britain. The BSC ensures that energy trades are settled accurately and that the system stays balanced in real-time. All licensed electricity suppliers and generators in Great Britain are required to become signatories to the BSC.

The Flexibility Market Rules are at the heart of the market facilitator's role. Designed to ensure that flexibility markets across Great Britain are consistent, accessible, and interoperable, these rules define how flexibility services operate in practice — covering everything from operational standards and data exchange protocols to service definitions and baseline methodologies. These rules set out the common processes and technical requirements that NESO and DNOs will be licence-bound to follow.

The Smart Secure Electricity Systems (SSES) Programme is designed to create the technical and regulatory frameworks to enable the untapped flexibility from small scale devices, such as domestic electric vehicle charge points and heat pumps.