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EXAA (Energy Exchange Austria) is the home exchange for the AT bidding zone. Its Classic auction runs at 10:15 CET, earlier than Nord Pool or EPEX Spot, making it the authoritative Austrian day-ahead price source. It also uniquely provides 15-minute MTU products for AT. - Add EXAAClient wrapping nexa-connect-exaa with CertificateAuth - Route BiddingZone.AT to EXAA; remove from _NORDPOOL_ZONES - Add DataSource.EXAA to types enum - Add nexa-connect-exaa git dependency - Add EXAA_* env var support to NexaClient (username, password, private_key_path, certificate_path) - 11 new tests for EXAAClient; 9 new tests for NexaClient routing - Update README status table, .env.example, and configuration docs Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
EXAAClientwrappingnexa-connect-exaawith certificate-based auth (CertificateAuth)BiddingZone.ATto EXAA (removed from Nord Pool's routing); EXAA's Classic auction at 10:15 CET is the authoritative Austrian day-ahead price and the only source of 15-minute products for ATDataSource.EXAAto the types enumNexaClientnow acceptsexaa_username,exaa_password,exaa_private_key_path,exaa_certificate_pathwith env var fallbacks (EXAA_*)EXAAClienttests; 9 new routing tests intest_client.pyFakeEXAAClientfromnexa-connect-exaafor offline testing (no live API calls)Design notes
EXAA's Classic auction (AT-only, 10:15 CET) is used rather than Market Coupling — it's the earlier, authoritative Austrian price and uniquely supports 15-minute resolution. DE-LU, NL, BE, FR remain on Nord Pool pending EPEX Spot implementation.
Test plan
make cipasses (lint, format-check, type-check, tests)exaa.pyat 86%BiddingZone.ATconfirmed absent from_NORDPOOL_ZONES, present in_EXAA_ZONES🤖 Generated with Claude Code