riffs">
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<h3 id="org1861ddb"><span class="section-number-3">4.1.</span> Tariff definitions</h3>
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At the top of the tariffs page you can define tariffs.
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For these to take effect, you must
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<li>Have the optimisation in network NPV mode - in whole-system mode the 'system boundary' considers only the fuel input for heat, whether that fuel goes into an individual system