The government's energy department clarified that the new entity will "complement, rather than replace, the existing institutions responsible for Britain's energy system" and that "the role of existing network operators remains unchanged." Shares in National Grid and SSE, two of the three firms that own and operate the grid, fell by about 0.5% on the announcement, matching broader market movements and indicating investors saw little immediate threat.
According to analysts, the real value of the plan lies in giving the regulator better data to drive down costs, rather than in taking direct operational control. The proposal does not involve any nationalisation or transfer of existing assets, marking a more cautious approach than some campaigners had hoped for.
Great British Grid is positioned as a public sector challenger rather than a replacement for the existing trio of private grid operators. The energy department's wording emphasises that GBG will work alongside current institutions, not against them. This limits the immediate risk to private sector revenues and explains the mild share price reaction.