# Energy efficiency The value of our digital miners is based not only on their [computing power](/faq/computing-power.md) in TH, but also on their energy efficiency in W/TH. {% hint style="info" %} Energy efficiency is the rational use of energy to provide a specified level of computing power. More energy-efficient mining decreases the overall level of energy consumption and, as a result, reduces the negative impact of mining on the environment. {% endhint %} Our digital miners, like real ones, use energy when mining. This is because the mining process takes place in a **real blockchain network**. That's why you pay electricity fees when you receive mining rewards. ### Energy efficiency VS Electricity fee **The lower the W/TH of the digital miner, the lower the electricity fee**, which is deducted from your rewards. And so the net reward is higher. The cost of electricity is variable and depends on various factors. For calculations, we always take the average electricity cost for the project over the billing period. It ranges from $0.05 to $0.07 per 1 kW. {% hint style="info" %} For example, the cost of electricity is $0.05, and your digital miner is 8 TH. Then the electricity fee per day is: * (28 W/TH \* 8 TH)/\* $0.05 \* 24 / 1000 = $0.2688 — for miner with energy efficiency 28 W/TH * (20 W/TH \* 8 TH) \* $0.05 \* 24 / 1000 = $0.192 — for miner with energy efficiency 20 W/TH * (15 W/TH \* 8 TH) \* $0.05 \* 24 / 1000 = $0.144 — for miner with energy efficiency 15 W/TH {% endhint %} Since the electricity is paid in USD and accruals from the pool are made in BTC, we recalculate the cost of electricity daily at the BTC rate at the time of payment. ### Energy efficiency upgrade You can upgrade your digital miner by boosting its energy efficiency. The more energy-efficient the miner, the higher your rewards. That's because miners with higher energy efficiency require less electricity and have lower electricity fees. To upgrade your miner, go to the Mining farm section, select the digital miner whose energy efficiency you want to increase, click Upgrade, and select Energy efficiency. Then choose the energy efficiency to which you want to upgrade the miner. Upgraded miners can be sold on the secondary market and upgraded again to maximum energy efficiency of 15 W/TH. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://help.nft.gomining.com/faq/energy-efficiency.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.