"An open-source relational database management system" matching MCP connectors:

Open registry of 1.14M+ rooftop-solar detections across France, queryable by natural language.

Free, no-key calculators with sources: household electricity bills and LED savings for Korea (KEPCO), Taiwan (Taipower), the Philippines (Meralco, updated monthly) and Japan (TEPCO); Seoul/Busan taxi fares, tourist tax refunds and trip budgets for Korea; Korean tax and education math. 19 read-only tools using the same rate tables as kwhmate.com, koreasurvivalkit.com and gyesanmate.com. Results cite date and source; nothing is stored.

Start with analyze_ev_site(address) for a free, source-backed EV charging opportunity screen.

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com.greencalculus

Sourced carbon emission factors + audit-traced calculations an AI can cite.

Find EV charging stations, detail, and reliability check-ins via the global Open Charge Map.

Dutch energy market, open data computed nightly: cheapest contracts, market levels, offer lifecycle

Indicative commercial rooftop solar assessments for Australian buildings, from open map data.

Comgás: 2nd Copy Download, official-source lookup. Platform-hosted, pay per query with prepaid credi

Use the free OKC HVAC Calculator to see whether repairing or replacing your heating or air system ma

Enel RJ: Installations List, official-source lookup. Platform-hosted, pay per query with prepaid cre

Enel CE: Download, official-source lookup. Platform-hosted, pay per query with prepaid credit.

Neoenergia (Elektro): Download, official-source lookup. Platform-hosted, pay per query with prepaid

CPFL: Download + OCR, official-source lookup. Platform-hosted, pay per query with prepaid credit.

SABESP: Bill Download, official-source lookup. Platform-hosted, pay per query with prepaid credit.

Enel SP: Download, official-source lookup. Platform-hosted, pay per query with prepaid credit.

Neoenergia (Elektro): Download + OCR, official-source lookup. Platform-hosted, pay per query with pr

Enel RJ: Download, official-source lookup. Platform-hosted, pay per query with prepaid credit.

Cemig: Bill Download, official-source lookup. Platform-hosted, pay per query with prepaid credit.

Cemig: Bill Download para Profissionais, official-source lookup. Platform-hosted, pay per query with

SABESP: Installations List, official-source lookup. Platform-hosted, pay per query with prepaid cred