Net metering is a well-known mechanism, where only energy exchanges of prosumers with the grid are accounted for in settlements. What is less known is the subtleness of the metering practices of energy suppliers behind the reported energy values. This paper discusses the implications of applying different net metering methods on a prosumer’s energy exchanges with the grid, and subsequently the effect on costs and self-consumption. The methods differ on whether netting is based on each individual phase (or on the overall energy flow) and the netting interval used for settlement. Besides describing and illustrating those differences, real data from a Danish household is used to quantify their impact. Results show that self-consumption increases from 38% to 53%, when moving from instantaneous per phase netting to hourly summation netting. The corresponding annual energy imports decrease from 1459 kWh to 1087 kWh. The economic implications of applying different netting methods are quantified and discussed, and we show that annual savings of at least €50 can be achieved by simply switching to a summation smart meter.

净计量是一种众所周知的机制，其中只有产消者与电网的能量交换才被计入结算。鲜为人知的是所报告的能源值背后的能源供应商计量做法的微妙之处。本文讨论了应用不同净计量方法对产消者与电网的能量交换的影响，以及随后对成本和自耗的影响。这些方法因是否基于每个单独的阶段（或基于整体能量流）和用于结算的网格间隔而异。除了描述和说明这些差异之外，来自丹麦家庭的真实数据也被用来量化它们的影响。结果表明，当从瞬时每相净额转换为每小时总和净额时，自我消耗从 38% 增加到 53%。相应的年度能源进口量从 1459 千瓦时减少到 1087 千瓦时。对应用不同净额结算方法的经济影响进行了量化和讨论，我们表明，通过简单地切换到总和智能电表，每年至少可以节省 50 欧元。