← GB Electricity Grid
energy by fourzerotwo
Wholesale market index price
Market Index Data: half-hourly wholesale price (£/MWh) and volume between two dates.
Wholesale market index price
Market Index Data: half-hourly wholesale price (£/MWh) and volume between two dates.
- price
- $0.002 / call
- free tier
- free allowance
- MCP tool
- gb-electricity__market-index
- method
- GET
GET https://fourzerotwo.si/v1/gb-electricity/market-index
| Param | Type | Description |
|---|---|---|
| from | string | Start date YYYY-MM-DD |
| to | string | End date YYYY-MM-DD |
# unpaid: returns 402 with the price curl -i "https://fourzerotwo.si/v1/gb-electricity/market-index?from=2026-10-09&to=2026-10-10" # free tier: send a free key from https://fourzerotwo.si/free curl -H "X-API-Key: fzt_…" "https://fourzerotwo.si/v1/gb-electricity/market-index?from=2026-10-09&to=2026-10-10"
Use it from an AI agent (MCP)
Add the server once, then ask for this data in plain English. The agent finds the endpoint with search_apis and runs it with call_api.
{
"mcpServers": {
"fourzerotwo": { "type": "http", "url": "https://fourzerotwo.si/mcp" }
}
}
# the call the agent makes
call_api {"tool": "gb-electricity__market-index", "arguments": {"from":"2026-10-09","to":"2026-10-10"}}
More from GB Electricity Grid
- Generation mix now — Current GB generation by fuel type (MW and %), latest 5-minute reading and last half hour / 24 hours.
- Generation by type, 24h — Actual generation by production type over the last 24 hours (solar, wind, nuclear, gas…).
- Generation mix history — Half-hourly generation by fuel type, recent history.
- Interconnector flows — Latest half-hourly flows on each interconnector (France, Norway, Netherlands, Belgium, Ireland, Denmark…), new...
- Interconnectors — Every GB interconnector and the bidding zone it connects to.
- Demand outturn — Initial national and transmission demand, half-hourly, last ~2 days.
- Daily demand — Total national demand per day, recent days.
- Peak demand — Daily peak transmission demand.
- Demand forecast, day ahead — Half-hourly national and transmission demand forecast for the next day.
- Demand forecast, 14 days — Daily peak demand forecast for the next two weeks.
- Demand forecast, 52 weeks — Weekly peak demand forecast for the year ahead.
- Wind forecast — Current wind generation forecast, half-hourly, for the next ~2 days.
Contains BMRS data © Elexon Limited copyright and database right 2026. Licence: https://www.elexon.co.uk/data/balancing-mechanism-reporting-agent/copyright-licence-bmrs-data/