Ratebook

Name: Ratebook
Author: cbetz

by cbetzversion 0.1.0i★ –iRuns on your computer

Registry nameio.github.cbetz/ratebook

Install

Overview

Description from the maker (original English)

Open MCP server for US electricity tariffs: real rate lookup, bill estimates, and when to charge.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
UsageiVery new↓ 16/wk · ★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs on your computer
Transport: stdio
Category: Other

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 1 of 1 passed
Runs on your computer with your user’s permissions (files, network, apps).
The registry lists no key to fill in.

You need

PyPIPython’s uv installed (for the uvx command)

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Open Claude Desktop → Settings → Developer → Edit Config, and paste this into claude_desktop_config.json

{
  "mcpServers": {
    "ratebook": {
      "command": "uvx",
      "args": [
        "ratebook-mcp"
      ]
    }
  }
}

Run this in your terminal

claude mcp add ratebook -- uvx ratebook-mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "ratebook": {
      "command": "uvx",
      "args": [
        "ratebook-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "ratebook": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "ratebook-mcp"
      ]
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

This one runs on your computer, and ChatGPT can only connect to servers on the internet. Pick another app.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account cbetz, which owns the repo
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
– Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
– Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
… Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints

Compared with others in Otheri

More stars than 0% of the other 18513 servers in this category
Published to the registry more recently than 12% of the other 18513 servers in this category
Basic checks equal to or better than 100% of the other 18513 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Ratebook safe?

It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed –, and the latest version (0.1.0) reached the registry 4 months ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Python (uv) on your computer.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Cape Winelands Visit Planner

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

Ratebook

The open rate engine for the electrified home — an openly licensed database of US electricity tariffs, an open-source rate-calculation engine, and an MCP server, so any app, device, or agent can answer "what will this kWh cost me, and when should I charge?"

↑ The real engine running in the browser. Try it yourself: demo/demo.html.

Status: pre-release. What works today: a deterministic rate engine (Python + a TypeScript

port held to it byte-for-byte), cross-validated against NREL's PySAM and shown to reproduce a

real bill's total once its components are supplied; an LLM pipeline that extracts tariff

structure from utility PDFs; an MCP server; and a Home Assistant integration. What's still in progress: broad utility coverage, freshness automation,

and a reproducible public accuracy scorecard. See docs/ROADMAP.md.

Quickstart

The engine has no I/O and no required data download — price a tariff in a few lines:

git clone https://github.com/cbetz/ratebook && cd ratebook

uv sync uv run python quickstart.py # or paste the snippet below into uv run python

from datetime import date

from decimal import Decimal from ratebook import ( Tariff, TariffIdentity, Sector, EnergyRateStructure, EnergyPeriod, EnergyTier, Schedule, FixedCharge, FixedChargeUnit, Usage, BillingWindow, estimate_bill, )

A flat residential tariff: $0.10276/kWh + $11.30/month (PECO Rate R distribution).

no_tou = tuple(tuple(0 for _ in range(24)) for _ in range(12)) # 12 months × 24 hours, one period tariff = Tariff( energy=EnergyRateStructure(periods=(EnergyPeriod(tiers=(EnergyTier(rate=Decimal("0.10276")),)),)), schedule=Schedule(weekday=no_tou, weekend=no_tou), identity=TariffIdentity(plan_code="R", plan_name="Example flat residential", sector=Sector.RESIDENTIAL), fixed_charges=(FixedCharge(Decimal("11.30"), FixedChargeUnit.PER_MONTH),), )

bill = estimate_bill(tariff, Usage.aggregate(1244), BillingWindow(date(2026, 4, 28), 30)) print(f"ok={bill.ok} total=${bill.total}") # ok=True total=$139.13344 → 1244 kWh × $0.10276 + $11.30

Real tariffs round-trip through JSON via Tariff.from_json(...). To work with corpus data, load the URDB seed set (uv run ratebook-data urdb) or run the MCP server (uv run ratebook-mcp) and ask an agent lookup_tariff / estimate_bill / compare_plans / best_charge_window.

Development

Python 3.12+, uv workspace with these packages: packages/ratebook (rate engine), packages/ratebook-data (data plant), packages/ratebook-mcp (MCP server), packages/ratebook-ts (the TypeScript engine port — pnpm + vitest, held to the Python engine via shared JSON test vectors), and packages/ratebook-homeassistant (a Home Assistant custom integration: electricity-price + cheapest-charge-window sensors).

uv sync                            # install all workspace packages + dev tools

uv run pytest # Python tests uv run ruff check . # lint uv run ratebook-data urdb # download URDB bulk CSV → data/raw/, load into data/ratebook.duckdb uv run ratebook-mcp # run the MCP server (stdio)

pnpm -C packages/ratebook-ts install && pnpm -C packages/ratebook-ts test # TS engine + vectors

The PySAM cross-validation runs in CI against committed tariff fixtures (uv sync --group validation installs the oracle). The MCP tool tests additionally need the built corpus and run locally (uv run ratebook-data urdb); they skip otherwise. The two engines must never diverge: both reproduce packages/ratebook/tests/vectors/v0_bills.json byte-for-byte. Regenerate it with uv run python packages/ratebook/tests/generate_vectors.py.

See CONTRIBUTING.md — the highest-value contribution is a tariff correction (report a wrong or stale rate with its source PDF).

License

Code is licensed under Apache-2.0. Published datasets are dedicated to the public domain under CC0-1.0. The seed corpus derives from the U.S. Utility Rate Database (CC0).

Ratebook

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Otheri

Common questions

Alternatives

Spec Driven Development

Remote Desktop Commander

Cape Winelands Visit Planner

README from the maker

Ratebook

Quickstart

A flat residential tariff: $0.10276/kWh + $11.30/month (PECO Rate R distribution).

Development

License