# voltcast

Gives your agent day-ahead power prices across European bidding zones, published forecasts and carbon intensity. Handy for costing a load or picking cheap hours.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI
- Author: Voltcast-com
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/Voltcast-com/mcp
- Updated: 2026-08-29
- HTML: https://affpapa.org/en/nevibecode/mcp/voltcast

## What it does

The server sits on top of Voltcast: day-ahead prices for European bidding zones at 15-minute native resolution, with history back to 2015. Forecasts are probabilistic — P50 on the lower plans, P10 and P90 once you are on Pro+. You also get carbon intensity and a green score from the live generation mix, wind and solar forecasts from both TSO and the Voltcast model against realized output, and a search for the cheapest contiguous window for a given load over the next 48 hours.

Two ways to run it. The hosted endpoint `https://voltcast.com/api/mcp` speaks Streamable HTTP, protocol `2025-06-18`. The local stdio server starts with `npx voltcast-mcp` or in Docker and is a thin proxy onto the same REST API, so tools, auth and rate limits match. It boots and answers introspection without a key, and `list_zones` needs no auth at all.

Everything else wants a key, sent as `Authorization: Bearer <api key>`. New accounts start on Home at €9/month after a 7-day trial that requires a card; existing Free accounts stay grandfathered. `cheapest_window` is Pro+ only. Forecast accuracy is benchmarked in public every day, losses included, and zones where the model loses to a naive baseline are free under the guarantee. Data comes from the ENTSO-E Transparency Platform and SMARD.de, attributed in every response.

## Requirements
- Remote server: `https://voltcast.com/api/mcp`

## Install

### Claude Code (native platform)

**Platform CLI: remote server**
```bash
claude mcp add --transport http voltcast https://voltcast.com/api/mcp
```

### Codex

**Platform CLI: remote server**
```bash
codex mcp add voltcast --url https://voltcast.com/api/mcp
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "voltcast": {
            "url": "https://voltcast.com/api/mcp"
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "voltcast": {
            "type": "http",
            "url": "https://voltcast.com/api/mcp"
        }
    }
}
```

### Gemini CLI

**Platform CLI: remote server**
```bash
gemini mcp add -t http voltcast https://voltcast.com/api/mcp
```

## When to use it
- price a load against exchange power rates
- pick the cheapest window to run a job
- compare forecast prices with realized ones
- estimate the carbon footprint of consumption from the generation mix
- check wind and solar forecasts against actual output

## Example prompts
- Show day-ahead prices for the DE-LU zone tomorrow
- Find the cheapest contiguous 3-hour window in the next 48 hours
- What is the carbon intensity in this zone right now, and its green score

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