Maintenance release fixing a test-suite issue reported by CRAN on
2026-05-27. The aemo_units() integration test made a live
MMSDM request without a skip_on_cran() guard, so it raised
an error on CRAN check machines whenever the NEMweb archive was
unreachable. The test is now guarded like the other network-dependent
tests and split into a gated live check and an offline-abort check that
verifies the no-fallback behaviour. No user-facing code changes.
First release under new maintainership. Reclaims the archived
aemo package name (Imanuel Costigan, 2014-2020, v0.1.0 to
v0.3.0, archived 2021-12-29). The prior package shipped three functions
covering regional prices and demand only; this release is an independent
rewrite covering the full NEMweb and MMSDM data surface and shares only
the package name.
Version starts at 0.4.0 to sit strictly above the last archived version (0.3.0).
aemo_price(): 5-min (DISPATCHPRICE) or 30-min
(TRADINGPRICE) regional wholesale prices. Pre-5MS (before 2021-10-01)
reads TRADINGIS; post-5MS 30-min prices are derived as the arithmetic
mean of six 5-min dispatch prices within each trading interval, matching
AEMO’s post-5MS TRADINGPRICE derivation.aemo_demand(): regional operational,
operational-less-SNSG, or native demand at 5-min resolution.aemo_price_caps(): static reference table of Market
Price Cap, Floor, CPT, and APC by financial year. Per-row source
citations to the specific AEMC determination.aemo_dispatch_units(): per-DUID generator output at
5-min. measure = "scada_mw" (default) returns SCADA actual;
"target_mw" returns DISPATCHLOAD TOTALCLEARED;
"both" returns INITIALMW + TOTALCLEARED + SCADAVALUE
paired, enabling ramp-trajectory research.aemo_interconnector(): NEM interconnector flows.aemo_rooftop_pv(): estimated rooftop PV actual or
forecast.aemo_fcas(), aemo_fcas_enablement(): FCAS
prices and enablement across the ten services live since 9 Oct
2023.aemo_constraints(): binding transmission and system
constraints with shadow prices.aemo_gencon(): GENCONDATA constraint equations.aemo_spd_constraints(): SPD constraint coefficient
tables (SPDREGIONCONSTRAINT, SPDINTERCONNECTORCONSTRAINT,
SPDCONNECTIONPOINTCONSTRAINT). Required for nempy-style dispatch
replication (Gorman et al. 2022 JOSS 7(70) 3596).aemo_outages(): NETWORK_OUTAGEDETAIL.aemo_market_notices(): MARKETNOTICEDATA feed (LOR,
RERT, interventions, suspensions). Pairs with the above for market-
event forensics (Rangarajan et al. 2025, Energy Economics 141).aemo_bids(): generator bid stack.
resolution = "day" (BIDDAYOFFER_D), "period"
(BIDPEROFFER_D), or "joined" (the two inner-joined on
(duid, settlementdate, bidtype) so price bands and volumes are
accessible together).aemo_predispatch(): P5MIN or PREDISPATCH forecasts.
Pass run_datetime to pin a specific forecast vintage
(required for forecast-error research; mirrors NEMSEER’s workflow,
Prakash 2023 JOSS 8(92) 5883).aemo_pasa(): short-term or medium-term projected
assessment of system adequacy. Default windows are horizon-aware.aemo_gas(): STTM and DWGM.aemo_units(): DUID registry. as_of
argument performs an effective-date join on DUDETAILSUMMARY so
historical queries see the registry as it was at any point in time (e.g.
Liddell’s DUIDs pre-2023 retirement).aemo_participants(): PARTICIPANT +
DUDETAILSUMMARY.aemo_regions(), aemo_interconnectors():
static metadata.aemo_mlf(), aemo_dlf(): marginal and
distribution loss factors from MMSDM.aemo_settlement(): SETCFM (energy cashflow),
SETFCASREGIONRECOVERY (FCAS recovery), and SETRESIDUECONTRACTPAYMENT
(settlement residues) for gentailer reconciliation workflows.aemo_snapshot(): returns a provenance record (source
URL, SHA-256 of the table body, row count, retrieved-at timestamp)
suitable for Zenodo deposit or paper appendix.aemo_nemweb_ls(), aemo_nemweb_download():
escape hatches for arbitrary NEMweb paths.aemo_cache_info(), aemo_clear_cache(),
aemo_throttle().Australia/Brisbane (AEST,
UTC+10, no DST). NER cl. 2.2.6. Using Australia/Sydney
would silently shift every summer interval by one hour.intervention = FALSE (default) filters DISPATCHPRICE to
the market pricing run (INTERVENTION = 0) used in
settlement. Pass intervention = TRUE for intervention runs
(e.g. the June 2022 NEM suspension).options("aemo.base_url") and
options("aemo.mmsdm_base") override the NEMweb host
endpoints, supporting the 30 April 2026 NEMweb URL migration without a
reinstall.Data is published by AEMO at http://nemweb.com.au under the AEMO Copyright
Permissions Notice https://www.aemo.com.au/privacy-and-legal-notices/copyright-permissions.
Downloads are cached to tools::R_user_dir("aemo", "cache")
on first use, with SHA-256 content verification on reuse.