@pipeworx/miso

MISO (Midcontinent ISO) real-time electricity data — fuel mix, load, five-minute LMPs, wind/solar forecast-vs-actual and transmission binding constraints for the 15-state footprint from Louisiana to Minnesota plus Manitoba.

Part of Pipeworx — an MCP gateway connecting AI agents to 1683+ live data sources.

Tools

• miso_fuel_mix(period?) — MW generated per fuel category (coal, gas, nuclear, wind, solar, hydro, battery storage, other) plus the footprint total. current (default) = the latest 5-minute interval; today / yesterday = the whole day.
• miso_lmp(region?, node?, limit?) — five-minute LMP $/MWh per pricing node with loss and congestion components and every ancillary-service clearing price (regulation, mileage, spinning, supplemental, short-term reserve, ramp up/down). ~1,600 nodes across the Central, North and South regions.
• miso_binding_constraints(kind?) — the flowgates currently binding, with their shadow price. transmission (default), subregional or reserve.
• miso_load() — today's actual load hour by hour against the medium-term load forecast for the same hours, plus the five-minute total-load series.
• miso_wind_solar() — hourly wind and solar forecast vs actual MW.

Auth

Keyless. No registration, no key, no rate-limit documented.

Data sources

• https://public-api.misoenergy.org/ — the live public API. Endpoint index is rendered as HTML at the root of that host.
• https://www.misoenergy.org/markets-and-operations/rtdataapis/ — MISO's own page for these feeds.

Traps

The endpoint everyone still cites is a silent zero. MISO's long-documented Real-Time Data Broker —

https://api.misoenergy.org/MISORTWDDataBroker/DataBrokerServices.asmx
  ?messageType=getfuelmix&returnType=json

— still resolves, still answers HTTP 200, and returns

{"error": "no data", "See": "https://www.misoenergy.org/markets-and-operations/rtdataapis"}

for every data messageType (getfuelmix, getlmpconsolidatedtable, gettotalload, …). Only getapiversion still carries a payload. Any client that checks res.ok reports success forever while returning nothing — the failure class in docs/silent-zero-policy.md. Verified dead 2026-09-17. This pack talks only to public-api.misoenergy.org, and misoGet throws on a body carrying a string error so a future retirement fails loudly instead of silently.

Other things worth knowing:

• Every number is a string. "34168", and in the /api/Snapshot display feed comma-grouped as "99,978". num() coerces and returns null — never 0 — for a blank, so "no reading" never reads as "zero megawatts".
• Timestamps are EST year-round. MISO does not shift the market clock for daylight saving; the payload labels this explicitly.
• /api/FuelMix is one interval, not a series. Use /Today or /Yesterday for the full day.
• MediumTermLoadForecast uses HourEnding, not Hour — unlike ClearedMW right beside it, which uses Hour. Keying both off Hour silently produces an all-null forecast column.
• /api/WindSolar/GetCombined returns future hours too, with actuals that are absent rather than meaningful. This pack emits null for an actual whose hour has not happened, rather than reporting 0 MW of wind at 11pm.
• getapiversion is gzipped without negotiation, so a raw curl without --compressed prints binary. Workers' fetch decompresses automatically.

Quick Start

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

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

What this endpoint actually serves

tools/list at https://gateway.pipeworx.io/miso/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 1683+ 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/miso_fuel_mix \
  -H 'Content-Type: application/json' \
  -d '{}'

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

Standalone (no gateway account)

This package also runs as a local stdio MCP server — no Pipeworx account, no gateway round-trip:

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

Or run it directly to confirm it starts:

npx -y @pipeworx/mcp-miso

It speaks MCP over stdin/stdout and answers initialize/tools/list/tools/call for only this pack's tools — none of the shared meta-tools the gateway connection above adds. Same source, same tools, no ask_pipeworx routing.

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 Miso data" })

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

More

• Docs and guides
• pipeworx.io

License

MIT