wattclear MCP server: US electricity tariffs inside Claude, ChatGPT, Cursor and VS Code.

MCP endpoint (Streamable HTTP, no sign-in): https://mcp.wattclear.com/mcp

claude.ai: Settings > Connectors > Add custom connector, paste the URL above.
Claude Code: claude mcp add --transport http wattclear https://mcp.wattclear.com/mcp

Tools: find_utilities_by_zip, list_tariffs, estimate_annual_cost, compare_plans.
Data: OpenEI Utility Rate Database (CC0), EIA (public domain), NREL ZIP-to-utility file (CC BY 4.0).