# Basis Climate – Energy Community Map

> Check whether any US location qualifies for IRS energy community tax credit bonuses under the Inflation Reduction Act.

## What This Tool Does

This API checks geographic coordinates against official government datasets to determine if a location qualifies for IRA clean energy tax credit bonuses:

- **Energy Community Adder (10% ITC / 10¢/kWh PTC bonus)**: Sections 45, 48, 45Y, 48E
  - Fossil Fuel Employment: MSA/county areas with ≥0.17% fossil fuel employment and above-average unemployment
  - Coal Closure: Census tracts with coal mine closures (after 1999) or coal plant retirements (after 2009), plus adjoining tracts
  - Brownfield Sites: EPA-designated sites under CERCLA §101(39)

- **Low-Income Community Adder (10-20% additional ITC)**: Section 48(e)/48E(h)
  - NMTC-qualified census tracts eligible for bonus credit
  - Tribal Lands: Federally recognized Indian reservations, trust lands, Hawaiian Home Lands, and Alaska Native villages (Category 2)

- **30C Alternative Fuel Refueling**: Section 30C
  - Low-income and non-urban census tracts eligible for 30C bonus credit

## API Endpoint

GET /api/check?lat={latitude}&lng={longitude}&year={year}

### Parameters
- `lat` (required): Latitude, -90 to 90
- `lng` (required): Longitude, -180 to 180
- `year` (optional): IRS notice period year (2024 or 2025, default: 2025)
- `categories` (optional): Comma-separated filter (fossil-fuel, coal-closure, low-income-community, tribal-lands, 30c-eligible)

### Example Request
GET /api/check?lat=40.7128&lng=-74.0060&year=2025

### Example Response
```json
{
  "lat": 40.7128,
  "lng": -74.006,
  "eligible": true,
  "categories": [
    { "id": "fossil-fuel", "label": "Fossil Fuel Employment", "eligible": true },
    { "id": "coal-closure", "label": "Coal Closure", "eligible": false },
    { "id": "low-income-community", "label": "Low-Income Community", "eligible": false },
    { "id": "tribal-lands", "label": "Tribal Lands", "eligible": false },
    { "id": "30c-eligible", "label": "30C Eligible", "eligible": true }
  ],
  "year": 2025
}
```

### Rate Limits
1000 requests per day per IP address.

## Data Sources
- Fossil Fuel Employment & Coal Closure: DOE National Energy Technology Laboratory (NETL)
- Brownfield Sites: EPA Enforcement and Compliance History Online (ECHO/ACRES)
- Low-Income Communities: DOE ArcGIS
- Tribal Lands: Census Bureau TIGER/Line AIANNH
- 30C Eligibility: CDFI Fund / Baker Tilly

## OpenAPI Spec
Available at /openapi.json

## Interactive Map
Available at the root URL — a full interactive map with layer toggles, address search, and bulk location analysis.