Maximum Demand Calculation (2026)

Understanding Maximum Demand Calculation Maximum demand refers to the highest level of electrical power required by a facility or installation during a specific period. Calculating this accurately is a cornerstone of electrical engineering, ensuring that systems are both safe and cost-effective. Why It Matters Calculating maximum demand serves two primary purposes:

The maximum demand has been determined using the Calculation Method as outlined in [relevant standard, e.g., AS/NZS 3000 or BS 7671]. This involves three primary steps:

3. Regulatory Compliance

Many grid codes penalize consumers who exceed their contracted MD (excess demand penalty, often 1.5x to 2x the normal rate).

Maximum Demand Calculation — Short Report

Overview

Maximum demand (MD) is the highest average power drawn by a consumer over a specified interval. It's used for billing, equipment sizing, and load management.

  1. Always differentiate between kW and kVA – remember power factor.
  2. Use demand factors and diversity factors cautiously – they come from empirical tables, not physics laws.
  3. Monitor, don't just calculate – real loads differ from design loads. Install power loggers.
  4. Control MD actively – sequence startups, add capacitors, and consider battery storage for peak shaving.

Need to calculate MD for a specific facility? Download our free MD calculator spreadsheet at [your-website].

Maximum demand refers to the highest electrical load expected to be drawn from a supply point at any single time. It is a critical design feature because it dictates the size of distribution cables, main protective devices, and the overall incoming supply capacity from the network operator. Core Calculation Methods