He also called for tighter regulation of the energy sector, even if it has an impact on competition.
Mr Holliday said: "We should be very worried there is not a masterplan. If you set an aspiration you [should] work out a plan to do this."
He fears that the government may decide the 15 per cent target is unachievable.
Meanwhile, Levi Roots, the man behind Reggae Reggae Sauce, helped the National Grid celebrate the third anniversary of its ONE initiative.
The event was held at the Motor Heritage Museum in Gaydon and focussed on National Grid's core value of respect.
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