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# Glossary

Quick reference for terms used throughout the documentation.

## A

**API Token**
: Your personal access key from Tibber. Get it at [developer.tibber.com](https://developer.tibber.com/settings/access-token).

**Attributes**
: Additional data attached to each sensor (timestamps, statistics, metadata). Access via `state_attr()` in templates.

## B

**Best Price Period**
: Automatically detected time window with favorable electricity prices. Ideal for scheduling dishwashers, heat pumps, EV charging.

**Binary Sensor**
: Sensor with ON/OFF state (e.g., "Best Price Period Active"). Used in automations as triggers.

## C

**Currency Display Mode**
: Configurable setting for how prices are shown. Choose base currency (€, kr) or subunit (ct, øre). Smart defaults apply: EUR → subunit, NOK/SEK/DKK → base.

**Coordinator**
: Home Assistant component managing data fetching and updates. Polls Tibber API every 15 minutes.

## D

**Dynamic Icons**
: Icons that change based on sensor state (e.g., battery icons showing price level). See [Dynamic Icons](dynamic-icons.md).

## F

**Flex (Flexibility)**
: Configuration parameter controlling how strict period detection is. Higher flex = more periods found, but potentially at higher prices.

## I

**Interval**
: 15-minute time slot with fixed electricity price (00:00-00:15, 00:15-00:30, etc.).

## L

**Level**
: Price classification within a day (LOWEST, LOW, NORMAL, HIGH, HIGHEST). Based on daily min/max prices.

## M

**Min Distance**
: Threshold requiring periods to be at least X% below daily average. Prevents detecting "cheap" periods during expensive days.

## P

**Peak Price Period**
: Time window with highest electricity prices. Use to avoid heavy consumption.

**Price Info**
: Complete dataset with all intervals (yesterday, today, tomorrow) including enriched statistics.

## Q

**Quarter-Hourly**
: 15-minute precision (4 intervals per hour, 96 per day).

## R

**Rating**
: Statistical price classification (VERY_CHEAP, CHEAP, NORMAL, EXPENSIVE, VERY_EXPENSIVE). Based on 24h averages and thresholds.

**Relaxation**
: Automatic loosening of period detection filters when target period count isn't met. Ensures you always get usable periods.

## S

**State**
: Current value of a sensor (e.g., price in ct/kWh, "ON"/"OFF" for binary sensors).

**State Class**
: Home Assistant classification for long-term statistics (MEASUREMENT, TOTAL, or none).

## T

**Trailing Average**
: Average price over the past 24 hours from current interval.

**Leading Average**
: Average price over the next 24 hours from current interval.

## V

**Volatility**
: Measure of price stability (LOW, MEDIUM, HIGH). High volatility = large price swings = good for timing optimization.

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💡 **See Also:**
- [Core Concepts](concepts.md) - In-depth explanations
- [Sensors](sensors.md) - How sensors use these concepts
- [Period Calculation](period-calculation.md) - Deep dive into period detection