2. ‘zero-emission building’ means a building with a very high energy performance, as determined in accordance with Annexes I and III, which contributes to the optimisation of the energy system through demand-side flexibility, where any very low residual amount of energy still required is fully covered by energy from:
(a) renewable sources generated or stored on-site
(b) renewable sources generated nearby off-site and delivered through the grid in accordance with Directive (EU) 2018/2001 [amended RED]
(c) a renewable energy community within the meaning of Directive (EU) 2018/2001 [amended RED]
or (d) renewable energy and waste heat from an efficient district heating and cooling system within the meaning of Directive (EU) .../.... [recast EED], in accordance with the requirements set out in Annex III