CAISO · Pricing
CAISO fifteen-minute LMP
Prices from CAISO's fifteen-minute market at every aggregated pricing node — the trading hubs, load aggregation points, resources and Western EIM areas — with the energy, congestion, loss and greenhouse-gas components, posted about 25 minutes before each interval. What intertie schedules settle on.
caiso-fmm-lmpevery 15 min, ~25 min ahead · 15m rows2,711 entitiesWhat is in it
- Updates
- every 15 min, ~25 min ahead · 15m rows
- Entities
- 2,711 entities — TH_NP15_GEN-APND, TH_SP15_GEN-APND, DLAP_PGAE-APND…
- Source timezone
- US Pacific — every timestamp Dryos serves is UTC
- Coverage
- 14 September 2026 to now
- Rows held
- 897,341
- Primary key
- iso, market, node, interval_start_utc
- On the map
- 426 of 2,711 placed — EIA-860M plant coordinates, matched by name within the area the node's energy price puts it in; and the substations CAISO's own price map draws
What it measures
Every value, its unit, and what the source means by it.
- Total LMP$/MWh
The fifteen-minute market price at the pricing node.
lmp_total - Congestion$/MWh
Marginal congestion component — the part that differs between nodes.
lmp_congestion - Losses$/MWh
Marginal loss component.
lmp_loss - Energy$/MWh
Marginal energy component, published by CAISO. Not one number per interval: the Western EIM areas balance separately.
lmp_energy - Greenhouse gas$/MWh
Greenhouse-gas component — CAISO's price for compliance on energy delivered into California. Usually zero.
lmp_ghg
Columns
Exactly what a request answers with, read from the API rather than written here.
| Column | Type | Description |
|---|---|---|
| interval_start_utcrequired | timestamp | Start of the settlement interval, UTC. Always UTC — the ISOs publish in local time with inconsistent DST handling.e.g. 2026-08-14T15:00:00Z |
| isorequired | string | Publishing ISO.e.g. ERCOT |
| marketrequired | string | Market the price cleared in: DAM (day-ahead), RTM (real-time, SCED), or RTPD for CAISO's fifteen-minute market.e.g. RTM |
| noderequired | string | Pricing node or settlement point identifier, as published by the ISO.e.g. HB_HOUSTON |
| node_type | string | Node classification. For ERCOT this is derived from the settlement point naming convention: HUB / LOAD_ZONE / DC_TIE / RESOURCE_NODE. For MISO it is the ISO's own pricing-node type: HUB (every aggregate, the eight trading hubs and the .AZ zones alike) / LOAD_ZONE / RESOURCE_NODE (a generator's node) / INTERFACE. For PJM it is the type on the row: HUB / LOAD_ZONE (a transmission zone) / INTERFACE / EHV / AGGREGATE for the aggregate streams, and RESOURCE_NODE (a generator's bus) / LOAD_BUS / EXTERNAL_BUS for the bus streams. For SPP it is read off SPP's own suffix on the Pnode behind the settlement location: HUB / LOAD_ZONE (a load area) / RESOURCE_NODE / DEMAND_RESPONSE / INTERFACE (a neighbouring operator). For CAISO it is the APnode type in CAISO's own reference: HUB (trading hubs) / LOAD_ZONE (every kind of load aggregation point) / RESOURCE_NODE / DEMAND_RESPONSE (a proxy or reliability demand resource, read off the resource id) / INTERFACE (intertie resources) / EIM_NODE (a Western EIM area's node — CAISO's EIMT, which holds the area's plants and its transfer points alike) / AGGREGATE (generation aggregation points, distributed-resource aggregations, flexible-ramp and imbalance-reserve zones). For NYISO it is LOAD_ZONE (the eleven zones) / INTERFACE (the four external proxy zones, the proxy buses of scheduled lines, and any generator NYISO files in an external zone) / DEMAND_RESPONSE (a demand-response provider) / RESOURCE_NODE (a bus in NYISO's generator reference, DER aggregations included) / LOAD_BUS (a bus NYISO prices beside the generators that no generator is registered to — transformer banks and load buses). For ISO-NE it is the location type ISO-NE publishes, a network node refined by the prefix on its name: HUB (the Internal Hub) / LOAD_ZONE (the eight) / INTERFACE (an external node) / DEMAND_RESPONSE (a demand-response aggregation zone) / HUB_NODE (one of the network nodes the Hub averages) / RESOURCE_NODE (a unit, UN., or a storage plant's asset-related demand, AR.) / LOAD_BUS (a load node, LD.).e.g. APND |
| lmp_totalrequired | number | Total locational marginal price, $/MWh.e.g. 41.83 |
| lmp_energy | number | Energy component, $/MWh.e.g. 39.12 |
| lmp_congestion | number | Congestion component, $/MWh. Signed so that total = energy + congestion + loss on every row: NYISO publishes it with the opposite sign, and it is stored negated.e.g. 2.94 |
| lmp_loss | number | Loss component, $/MWh.e.g. -0.23 |
| lmp_ghgrequired | number | Greenhouse-gas component, $/MWh — CAISO's price for greenhouse-gas compliance on energy delivered into California. CAISO's LMP is energy + congestion + loss + this.e.g. 0.0 |
| source_published_at_utc | timestamp | When the ISO published this interval, UTC. Lets a buyer distinguish 'we were slow' from 'the ISO was slow'. |
| collected_at_utcrequired | timestamp | When Dryos collected this row, UTC. Stamped by the platform, not the collector. Together with interval_start_utc this makes freshness auditable per row instead of only in aggregate.e.g. 2026-08-15T21:22:09Z |
Read it
Public, read-only, no key and no sign-up. Relative times stay relative, so a URL keeps working.
The newest rows
curl "https://api.dryos.ai/v1/datasets/caiso-fmm-lmp/query?node=TH_NP15_GEN-APND&limit=12"The catalogue entry — every column, its type and the source
curl "https://api.dryos.ai/v1/datasets/caiso-fmm-lmp"Hourly averages for the last day
curl "https://api.dryos.ai/v1/datasets/caiso-fmm-lmp/query?node=TH_NP15_GEN-APND&start=-24h&interval=1h&agg=avg"Full parameters — bucketing, aggregation, filters and search — are on the API reference.
Ask an agent
The same stream through the Model Context Protocol, so Claude, ChatGPT, Cursor or any MCP client can query it directly.
claude mcp add --transport http dryos https://api.dryos.ai/mcpThen ask:
What has Total LMP been at TH_NP15_GEN-APND over the last 24 hours, and when did it peak?
Setup for every client is on the MCP server page.
Changes to this collector
A change in the collector is a change in the data. Anyone reading a step in a series is owed the day it moved under them.
- 2026-09-14
First collected, from CAISO OASIS.
The third of CAISO's energy markets, beside the day-ahead and the five-minute. Reconciled against a live response on 2026-09-14.
How this stream is checked
- Pulled straight from CAISO OASIS · PRC_RTPD_LMP (fifteen-minute market) — no reseller in between — and compared against that file before it is served.
- Null means the source did not report it — never zero.
- A reading lands every 15 min, ~25 min ahead; the interval timestamp is the start of the interval, in UTC.
- CAISO's market clock is US Pacific; OASIS answers in UTC. Every timestamp Dryos serves is UTC.
Related streams
- CAISO real-time LMPCAISO
Real-time dispatch prices at every CAISO aggregated pricing node — the NP15, SP15 and ZP26 trading hubs, the utilities' load aggregation points, resources, and the pricing points of every Western Energy Imbalance Market area — with the energy, congestion, loss and greenhouse-gas components, every five minutes.
every 5 min · 5m rows2,711 entitiescaiso-realtime-lmp - CAISO day-ahead LMPCAISO
Hourly day-ahead prices at every node CAISO clears in its day-ahead market — the NP15, SP15 and ZP26 trading hubs, the utilities' load aggregation points, resources and PacifiCorp's Extended Day-Ahead Market nodes — with the energy, congestion, loss and greenhouse-gas components, posted for the whole of tomorrow each afternoon.
daily, early afternoon PT · 1h rows1,907 entitiescaiso-dam-lmp - CAISO day-ahead binding constraintsCAISO
Every transmission constraint CAISO's day-ahead market bound on, hour by hour, with the contingency it bound for and its shadow price, posted for the whole of tomorrow each afternoon.
daily, early afternoon PT · 1h rows32 entitiescaiso-dam-shadow-prices - CAISO real-time binding constraintsCAISO
Every transmission constraint CAISO's real-time dispatch was up against, five minutes at a time, with the contingency it bound for and its shadow price.
every 5 min, when bound · 5m rows28 entitiescaiso-rt-shadow-prices - CAISO fuel mixCAISO
What is generating across CAISO every five minutes — solar, wind, geothermal, biomass, biogas, small and large hydro, coal, nuclear, gas, batteries and net imports.
every 5 min · 5m rows13 entitiescaiso-fuel-mix - CAISO system loadCAISO
CAISO-wide demand every five minutes — the Current demand line on caiso.com's Today's Outlook — flagged on the evenings CAISO is calling on demand response.
every 5 min · 5m rows1 entitycaiso-system-load