Ofgem MCP Server

@pipeworx/ofgem

Ofgem energy data — the UK energy regulator's published statistics on the domestic price cap and what it is made of, wholesale gas and electricity prices, supplier market shares, switching, debt and customer service, returned as tabular rows rather than pictures.

Part of Pipeworx — an MCP gateway connecting AI agents to 1867+ live data sources. This is an independent, unofficial integration — not affiliated with, endorsed by, or published by the upstream provider.

Tools

• ofgem_datasets(query?, page?) — the Data Portal catalogue (~190 datasets). Returns dataset_id, the id every other tool here takes.
• ofgem_price_cap(payment_method?, periods?) — the default tariff cap by period, broken into wholesale / network / policy / operating / debt / EBIT / VAT components, for Direct Debit, prepayment or standard credit.
• ofgem_dataset_rows(dataset_id, limit?, latest_first?) — the full source table behind any Data Portal dataset.

Auth

Keyless.

Data sources

• https://www.ofgem.gov.uk/api/listing/2156 — the Data Portal chart catalogue.
• https://app.everviz.com/inject/{dataset_id}/ — the source table for one dataset.

Things worth knowing:

• There is no CKAN, no Opendatasoft and no JSON:API. data.ofgem.gov.uk does not resolve at all (no A record; it has MX records only). /jsonapi, /api/v1/datasets and /api/search are 404s. The Data Portal page renders nothing server-side — a plain fetch of /news-and-insight/data/data-portal/all-available-charts contains zero dataset links, so scraping the HTML returns an empty list, not an error.
• The catalogue is /api/listing/{paragraph_id}, the endpoint the portal's own front end calls (found in themes/custom/numiko/dist/filter-listing-legacy-*.js). 2156 is the chart listing's paragraph id. It takes fulltext= and page= (0-based, 24 per page) and reports the match count in meta.count.
• Each catalogue row carries its dataset payload as HTML-escaped JSON inside a data-js-chart-modal-data attribute on the row's teaser markup, not as a JSON field. It has to be unescaped and parsed out.
• The table is not on ofgem.gov.uk. Ofgem publishes each dataset through everviz (Highsoft), and the everviz embed script carries the source table as CSV in options.data.csv. That CSV is the data; this pack parses it.
• Dates in those CSVs are US-ordered (mm/dd/yyyy) even though every figure is British, and the price-cap breakdown tables use period labels ("Oct - Dec 2026") rather than dates. Row labels are returned verbatim.
• CSV headers repeat and some are blank spacers used for chart layout. Blank-named columns are dropped; duplicate names get a (2) suffix so one column never silently swallows its neighbour.
• ofgem_price_cap resolves its dataset from the live catalogue first and only falls back to the known everviz ids, so an upstream rename degrades to a stale id rather than to no answer.

Quick Start

Add to your MCP client (Claude Desktop, Cursor, Windsurf, etc.):

{
  "mcpServers": {
    "ofgem": {
      "url": "https://gateway.pipeworx.io/ofgem/mcp"
    }
  }
}

What this endpoint actually serves

tools/list at https://gateway.pipeworx.io/ofgem/mcp returns the tools in the table above plus the shared Pipeworx meta-tools — ask_pipeworx, discover_tools, search_within, remember/recall and the rest of the gateway-wide set. So the tool count you see is larger than this table: a single-pack endpoint currently lists roughly 30 shared tools alongside the pack's own. The connection's initialize response states its exact scope, and is the authoritative answer for a given day.

This is deliberate, not multiplexing by accident. The meta-tools are what let a scoped connection answer a question this pack does not cover — via ask_pipeworx, which routes across the whole catalog — without you adding a second MCP server. There is currently no way to mount a pack endpoint without them; if the extra schemas cost you more context than the routing is worth, connect to the full gateway once rather than to several pack endpoints.

Or connect to the full Pipeworx gateway to get every pack's tools listed directly, instead of just this one's:

{
  "mcpServers": {
    "pipeworx": {
      "url": "https://gateway.pipeworx.io/mcp"
    }
  }
}

Both URLs reach the same gateway and the same 1867+ data sources. The only difference is which pack's tools are listed directly; ask_pipeworx reaches all of them from either one.

No MCP client? Call it over HTTP

curl -X POST https://gateway.pipeworx.io/v1/tools/ofgem_datasets \
  -H 'Content-Type: application/json' \
  -d '{"query":"price cap"}'

No account needed for the first calls. Inspect any tool: GET https://gateway.pipeworx.io/v1/tools/ofgem_datasets. Find one: POST https://gateway.pipeworx.io/v1/tools/search_packs with {"query":"..."}.

Run it from npm

@pipeworx/mcp-ofgem is a local stdio bridge to the Pipeworx gateway: your MCP client starts it with npx, and it forwards every call to the same https://gateway.pipeworx.io/ofgem/mcp endpoint shown above. It needs network access; there is no offline mode.

{
  "mcpServers": {
    "ofgem": {
      "command": "npx",
      "args": ["-y", "@pipeworx/mcp-ofgem"]
    }
  }
}

Without a key it calls anonymously, capped at 50 calls a day. A free account raises that to 200 a day: get a key at https://pipeworx.io/signup and add "env": { "PIPEWORX_API_KEY": "<your key>" } to the server entry. The key is sent as a Bearer token, the same way a hosted connection sends it, so calls are metered and billed exactly as they are there.

It lists only this pack's tools by default. Set PIPEWORX_META_TOOLS=1 to also list ask_pipeworx and the other gateway-wide tools.

Behind an HTTPS proxy: Node's built-in fetch does not read HTTPS_PROXY by default. Newer Node releases honour it when NODE_USE_ENV_PROXY=1 is set; check your Node version's documentation.

Using with ask_pipeworx

Instead of calling tools directly, you can ask questions in plain English — this works on the pack endpoint above as well as on the full gateway:

ask_pipeworx({ question: "your question about Ofgem data" })

The gateway picks the right tool and fills the arguments automatically.

More

• Docs and guides
• pipeworx.io

License

MIT