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REE + CNMC · monthly publications since March 2026

Know first when capacity is released at a node.

Holgura unifies the access-capacity publications of REE and the CNMC, keeps the history the official viewers overwrite, and alerts you by email, webhook or API minutes after a node frees up megawatts.

Create a free accountSee the API
—nodes tracked
—nodes liberated in —
—publications archived since —
AvailableSaturatedNo agreed valueSize ∝ √MW available

The problem

Three in four transmission nodes are saturated. The rest change every month.

REE and the CNMC publish capacity once a month. The viewer only shows the latest snapshot: last month's figures disappear, and nobody tells you when a node frees up.

75%of transmission nodes had no capacity for new demand (REE, February 2026)
  • Whoever spots a liberation first files their access request first.
  • Diffing monthly files by hand takes hours and breaks with every format change.
  • Without history you can't value a portfolio or explain a node's saturation.

How it works

From the official publication to your system, in minutes.

  1. 01

    We archive every publication

    We fetch REE's files and the CNMC's maps as soon as they appear, several times a day during the first days of each month, and keep the original with its SHA-256 fingerprint.

  2. 02

    We compare it with last month

    We read each column by its official header, keep nodes unified even when they are renamed, and compute the changes: liberated, saturated, increase, decrease.

  3. 03

    We alert you and serve it by API

    Signed email and webhooks following your rules; full history and current state by API with an X-API-KEY key.

Liberated in the latest publication

See all on the map

Informative data mirrored from REE and the CNMC. Values do not add up across nodes. Not a guarantee of access.

Who it's for

For the people who decide where to connect.

Battery (BESS) developers

Nodes with storage headroom, on both the consumption and injection side.

  • Alert when storage capacity is freed
  • Webhook into your CRM or GIS
  • Capacity in process as a competition signal

Data centres

220 and 400 kV nodes with demand capacity, and tender nodes.

  • Filters by voltage and minimum MW
  • Tender node tracking
  • CSV export for your studies

Infrastructure funds and investors

Saturation history to value portfolios before buying them.

  • Monthly series per node since March 2026
  • Saturation ratio over the last 12 months
  • Full data licence (Enterprise)

API

The same response you'll see in your code.

Every response carries the date of the official publication it mirrors and the legal notice. No SDK needed: any HTTP client works.

API documentation
curl -s https://api.holgura.dev/api/v1/nodes/ES-REE-ABADIANO220 \
  -H "X-API-KEY: $HOLGURA_KEY"
{
  "status": "success",
  "meta": {
    "timestamp_consult": "2026-10-22T06:51:31Z",
    "source_data_mirror_date": "2026-10-01",
    "disclaimer": "Data mirrored from official REE and CNMC publications. Holgura certifies synchronisation correctness, not grid-access awards. Not investment advice.",
    "plan": "pro"
  },
  "data": {
    "node_code_clean": "ES-REE-ABADIANO220",
    "official_name": "ABADIANO 220",
    "voltage_level_kv": 220,
    "network": "transmission",
    "operator": "REE",
    "location": { "province": "Bizkaia", "autonomous_community": "País Vasco" },
    "capacity": {
      "available_demand_mw": 0,
      "available_storage_mw": 345,
      "status": "SATURATED",
      "last_official_update": "2026-10-01"
    },
    "metrics": { "months_saturated_last_year": 3, "saturation_ratio_percent": 100 },
    "historical_log": [
      { "date": "2026-08-01", "value_mw": 0, "status": "SATURATED", "source": "ree_demanda" },
      { "date": "2026-09-01", "value_mw": 0, "status": "SATURATED", "source": "ree_demanda" },
      { "date": "2026-10-01", "value_mw": 0, "status": "SATURATED", "source": "ree_demanda" }
    ]
  }
}

Pricing

Start free. Pay when you need the alert the moment it happens.

Paid plans open soon: register your interest and we will let you know. The Free plan is open now.

Free

To explore the map and try the API.

Free

  • Map and table with the latest publication
  • History for the last 3 months
  • Monthly summary by email
  • 3 watched nodes
  • 500 API requests per month
  • 10 requests per minute
  • 1 user
Create a free account

Pro

Most chosen

For when you need the alert the day it's published.

390 €/month

  • Map and table with the latest publication
  • Full history since March 2026
  • Instant alerts by email and signed webhook
  • Unlimited watchlists and nodes
  • 50,000 API requests per month
  • 60 requests per minute
  • 3 users
  • CSV export
  • 3 webhook endpoints

Team

For development and analysis teams.

990 €/month

  • Map and table with the latest publication
  • Full history since March 2026
  • Instant alerts by email and signed webhook
  • Unlimited watchlists and nodes
  • 500,000 API requests per month
  • 300 requests per minute
  • 10 users
  • CSV export
  • 10 webhook endpoints

Enterprise

Data licence and tailored agreements.

from 2,500 €/month

  • Map and table with the latest publication
  • Full history since March 2026
  • Instant alerts by email and signed webhook
  • Unlimited watchlists and nodes
  • No monthly API request limit
  • 1,200 requests per minute
  • Unlimited users
  • CSV export
  • Data processing agreement (DPA) and SLA
  • Full historical dump and tailored DSO sources

Founding customers

€300 per month, locked for 12 months.

For the first companies that help us refine the product: the full Pro plan at the founding price and a direct line to the people building it.

  • Everything in Pro
  • Fixed price for 12 months
  • Monthly product meeting

Apply for a founding place

Trust

Official data, hosted in the EU.

A faithful mirror of the source

We mirror exactly what REE and the CNMC publish, with the original file archived. We don't estimate or fill gaps.

GDPR by default

No tracking cookies or third-party analytics. We keep only what your account needs. Export or delete your data any time.

Hosted in the EU

Hetzner servers in Germany and Finland. Encrypted backups, immutable for 30 days.

No advice

Holgura gives no investment advice and does not guarantee access. Requests go to the grid operator.

Frequently asked questions

How often is the data updated?

REE publishes transmission capacity in the first five working days of each month; the CNMC updates its maps monthly. We check several times a day and process each publication in minutes.

Is it legal to reuse this data?

They are official, publicly available publications. We mirror them unaltered, with attribution to REE and the CNMC.

How do alerts work?

You define a rule (nodes, a list, a province or an operator; the kind of change; minimum MW). When a new publication matches, we send you an email or a signed webhook. On the free plan you get the monthly summary.

What does “no agreed value” mean?

The operator hasn't published a value for that node, for example because transmission and distribution haven't agreed the reference value. It is not 0 MW and we never show it as 0.

Can I cancel any time?

Yes. No commitment: cancel from the console and you return to the free plan at the end of the period.

Does Holgura guarantee I can connect?

No. Only the grid operator grants access. Holgura tells you where and when capacity is published.