← All glossary terms

Power Fundamentals

High voltage

High voltage is generally associated with transmission or sub-transmission systems and large industrial service. It can unlock large-load options, but it also brings more complex interconnection, protection, clearances, equipment lead times, and utility coordination.

Explore more terms

MWh

Megawatt-hour equals one MW used for one hour. MWh matters for energy cost, emissions, battery duration, and renewable matching, while MW matters for peak capacity and grid impact.

Read definition →

Lit service

Lit service is active network service delivered over fiber using provider-managed electronics. It is easier to consume than dark fiber but may offer less control over capacity, routing, and upgrades.

Read definition →

DCiE

Data Center Infrastructure Efficiency is the inverse of PUE, calculated as IT energy divided by total facility energy. It is less common than PUE today but still useful when reading older efficiency materials.

Read definition →