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Halcyon Data Subscriptions

Quickly evaluate energy market dynamics and find new growth opportunities with regularly updated data sets collated from authoritative sources nationwide 
UPDATED - April 15 2026

Gas Power Plant Tracker

247 Plants 153GW Capacity

US gas-fired power plant costs have tripled this decade. Halcyon has built a multi-state, centralized feed of all planned US assets, with asset-level technology, timelines, prices, and changes.

UPDATED - May 13 2026

Large Load Tariff Tracker

161 Tariffs

Large load tariffs are specialized electricity rate structures designed for customers with significant power demand, like data centers. These tariffs are used to allocate costs more equitably, ensure grid stability, and manage risk.

UPDATED - April 27 2026

Rate Case Tracker

278 Rate Cases 84M Utility Customers

Track key metrics from all IOU-submitted rate cases across the country.

UPDATED - May 11 2026

Battery Energy Storage
System Tracker

734+ BESS representing ~325 GWh 

Track planned U.S. utility-scale storage, with asset-level technology, timelines, prices, and changes.

UPDATED - May 1 2026

New Substation
Development Tracker

Track 445+ projects informing new substation development nationwide.

December 3 2025

FERC ANOPR Comment Analysis

175 Organization comments

This workbook summarizes comments submitted regarding FERCs proceeding on the interconnection of large load (RM26-4-000).

Don’t see what you need? 

We have a pipeline of Data Subscriptions in development, we’d love to hear what’s important to you. Please reach out.

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E3 and Halcyon: Large Load Tariff Whitepaper 

As data centers and AI-enabled computing drive a scale of load growth utilities haven't seen in decades, large load tariffs have become the primary mechanism for allocating costs and protecting existing customers from cost shifts — but designs vary so widely that comparing them is difficult. In this new whitepaper, E3 partners with Halcyon to leverage data from Halcyon's Large Load Tariff Tracker and examine how these tariffs translate into actual electricity bills for large customers and how costs differ across regions and rate designs.

Download the whitepaper now, for free.