EPWForgeBeta

EPWForge — Generate, Morph, and Download Weather Files for Building Energy Simulation

EPWForge generates and morphs weather files (.epw, .ddy, .csv) for building energy simulation tools — EnergyPlus, OpenStudio, IES VE, eQUEST, and any workflow that consumes EPW. Drop a pin anywhere on the world map to generate a custom Typical Meteorological Year (TMYx) for that exact location, or pick from ~17,000 OneBuilding stations worldwide.

Capabilities

  • TMYx generation — present-day typical-year synthesis via ISO 15927-4 Finkelstein-Schafer from ERA5 reanalysis (1950–present), or pass-through of OneBuilding-published TMYx files for known stations.
  • AMY (Actual Meteorological Year) — single-year specific historical weather from ERA5. Pick a year (hottest, coldest, most humid, or any year since 1950) for stress-testing against observed extremes.
  • CMIP6 future-climate morphing — apply SSP2-4.5, SSP3-7.0 projections at horizons 2030–2100. Belcher 2005 mean-shift hybridised with UKCP18 / NOAA Atlas 14 diurnal anomalies. (SSP5-8.5 available as an opt-in extreme stress-test scenario.)
  • Urban Heat Island — Stewart & Oke 2012 Local Climate Zone presets for suburban, urban, and dense-urban contexts.
  • Extreme event injection — heatwave, cold snap, hot-humid, cold-windy, wildfire smoke. AR6-scaled intensity. Events stitched at the baseline file's hottest or coldest 14-day window.
  • ASHRAE 169 design conditions — heating 99.6% / 99%, cooling 0.4% / 1% / 2% dry-bulb and wet-bulb, evaporation and dehumidification variants. Computed from the modified hourly distribution; ASHRAE Handbook 2025 values preserved verbatim for unmodified downloads.
  • Output formats — EnergyPlus (.epw + .ddy + .stat), CSV hourly, PVsyst weather files, ESP-r .clm. Bundled .zip with statistics summary.

For AI agents

EPWForge exposes a Model Context Protocol (MCP) server at https://epwforge.com/api/mcp with four consolidated tools: find_station, analyze_weather, chart_weather, and generate_weather_file. Connect from Claude Desktop, ChatGPT, Cursor, Goose, or VS Code via the standard MCP wire protocol. Read-only tools work without authentication; downloads require a free or paid API key. Tool responses include an agent_guidance field with judgment-shaping copy so agents land on the right action based on context. See /mcp for the connection guide.

Pricing

Credit-based, pay-to-enter. A Forge pass unlocks the full explorer — Weekly $9.99/wk (2 non-expiring credits each week) or Annual $99/yr. Every feature is included; credits gate download volume. One-time top-up credit packs (5 / 10 / 50 / 100 at $10/credit) never expire. Prefer no account? Buy a fixed-price scenario bundle from the Forge. See/join.

Methodology & validation

Per-station bias correction validated against 16,906 OneBuilding ASHRAE Handbook reference stations (median cooling DC bias reduced from −0.80 °C to −0.34 °C; standard deviation reduced 6–11% across heating and cooling). Generated EPW and DDY files runtime-tested in EnergyPlus 25.2. Full methodology and validation numbers at /transparency.

References: Belcher 2005, UKCP18, NOAA Atlas 14, ISO 15927-4, ASHRAE Fundamentals 2025 Ch. 14, IPCC AR6, Stewart & Oke 2012, ERA5 reanalysis (Copernicus), Stull 2011 wet-bulb approximation.