SJ/T 11999-2025 Data Center Energy Efficiency Evaluation
Evaluation methods for energy utilization in data center
Standard Details
SJ/T 11999-2025 (English Version)
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SJ/T 11999-2025 (Chinese Version)
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Standard Introduction
Drafted by CESI in collaboration with NIM, Tsinghua University, and major operators including China Telecom and China Unicom, this standard went into effect in November 2025.
It divides data centers into four grades, with Grade 1 requiring a composite score of 85 or above.
The measurement protocols specify exactly where to install Class 1 electricity meters—at the transformer low-voltage side for total input, and at the UPS or PDU output for IT load—so that the resulting EEUE numbers are comparable across different facilities and designs.
Standard Catalog
The standard consists of the following main sections:
1 Scope 1
2 Normative References 1
3 Terms and Definitions 1
4 Abbreviations 2
5 Data Center Energy Utilization Level Classification 2
6 Data Center Comprehensive Energy Utilization Evaluation Content 2
6.1 Overview 2
6.2 Energy Consumption Measurement 2
6.2.1 Measuring Equipment 2
6.2.2 Measuring Position 3
6.2.3 Measuring Conditions 3
6.3 EEUE 4
6.3.1 EEUE Measured Value Calculation 4
6.3.2 EEUE Adjustment Value 4
6.3.3 EEUE Corrected Value Calculation 4
6.4 REF 4
6.4.1 REF Calculation 4
6.5 SEUR 4
6.5.1 SEUR Calculation 4
6.6 ERF 5
6.6.1 ERF Calculation 5
6.7 Energy Utilization Management 5
6.7.1 Energy Statistics and Analysis 5
6.7.2 Operation Management 5
6.7.3 Publicity and Training 6
7 Data Center Energy Utilization Evaluation Method 6
7.1 Calculation Formula 6
7.2 Data Center Comprehensive Energy Utilization Scoring Table 6
7.3 Itemized Evaluation Methods 7
7.3.1 EEUE 7
7.3.2 REF 7
7.3.3 SEUR 7
7.3.4 ERF 7
7.3.5 Energy Utilization Management 8
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