17) määratud tarne – turuosalisele temaga kauplemisperioodiks kokkulepitud sellise elektrienergiakoguse müümine, millest on bilansihaldurile ette teatatud käesolevas seaduses ja elektrituru toimimise võrgueeskirjas sätestatud korras;, defineeritakse selle seaduse ulatuses, 17) ‘fixed supply’ means the sale to a market participant of a fixed amount of electricity which is agreed upon in advance for a trading period and of which the balance provider is informed in advance under the rules established in this Act and the network code on the functioning of the electricity market;, defined within the scope of this Act