Deal structure and finance

AFFO

Adjusted Funds From Operations. REIT-industry cash-flow metric, roughly operating cash flow minus recurring maintenance capex.

CIM

Confidential Information Memorandum. The marketing document seller-side advisors prepare for prospective buyers, presenting revenue, EBITDA, growth story, and rationale for sale.

CoC

Change of Control. Contractual clauses that trigger renegotiation, consent requirement, or termination when a counterparty is acquired or its ownership changes.

DCF

Discounted Cash Flow. Valuation method that discounts projected cash flows back to present value using a required return rate.

DD

Due Diligence. The workstream discipline of testing a target's claims before committing to a transaction.

EBITDA

Earnings Before Interest, Tax, Depreciation, and Amortisation. The most commonly referenced operating-earnings metric in M&A pricing.

EV

Enterprise Value. Purchase price plus debt assumed minus cash. Total value of the business excluding capital structure.

IC

Investment Committee. The decision-making body inside a PE firm or investor that approves or rejects a proposed transaction.

IPO

Initial Public Offering. A private company's first sale of shares to the public market.

JV

Joint Venture. Business arrangement where two or more parties pool resources for a specific project, with separate governance and defined economic sharing.

LBO

Leveraged Buyout. Acquisition financed primarily with debt secured against the target's own cash flows.

LOI

Letter of Intent. Non-binding document expressing a party's intention to enter a transaction on outlined terms.

LP

Limited Partner. Investor in a PE or infrastructure fund who commits capital but does not manage day-to-day investment decisions.

MOIC

Multiple On Invested Capital. Fund-return metric: total distributions divided by capital invested.

NDA

Non-Disclosure Agreement. Signed before sharing confidential deal information with a prospective buyer or advisor.

PortCo

Portfolio Company. A company owned by a PE fund as part of its investment portfolio.

QoE

Quality of Earnings. DD workstream that normalises reported EBITDA by reclassifying add-backs and adjusting for one-time items.

R&W

Representations and Warranties. Seller statements about the target's condition. R&W insurance covers buyer's post-close claims arising from breaches.

SPA

Sale and Purchase Agreement. The binding legal contract that closes a transaction.

SPV

Special Purpose Vehicle. A legal entity created for a specific transaction or asset, ring-fenced from the parent's other operations.

Regulatory and jurisdictional

CFIUS

Committee on Foreign Investment in the United States. US inter-agency review body that screens foreign acquisitions of US businesses for national security implications.

EU FDI

European Union Foreign Direct Investment screening. Country-specific regulatory regimes reviewing foreign acquisitions of critical assets.

HSR

Hart-Scott-Rodino Antitrust Improvements Act. US merger notification threshold and review regime.

NSI Act

National Security and Investment Act. UK regime for reviewing acquisitions in 17 sensitive sectors on national security grounds.

NRC

Nuclear Regulatory Commission. US federal agency regulating civilian use of nuclear materials and facilities.

OFAC

Office of Foreign Assets Control. US Treasury body enforcing economic sanctions.

Power, grid, and utility

AEP

American Electric Power. Investor-owned utility operating in 11 US states including Ohio.

BTM

Behind-the-Meter. Power generation located on the customer side of the utility meter, not going through the public grid.

CAISO

California Independent System Operator. The grid operator for most of California.

ERCOT

Electric Reliability Council of Texas. Grid operator for most of Texas, operating largely as an electrical island.

GW

Gigawatt. One thousand megawatts of electrical power.

HVDC

High-Voltage Direct Current. DC transmission at hundreds of kilovolts, used for long-distance and undersea power transmission.

ISA

Interconnection Service Agreement. Contract between a load or generation customer and the transmission owner authorising a specific connection.

ISO

Independent System Operator. Regional grid operator (e.g. ERCOT, MISO, PJM, CAISO). Manages transmission access and wholesale market operations.

IT-GW

IT Gigawatt. Unit measuring data centre compute capacity as the power delivered to IT equipment, distinct from total site power supply.

LTLLR

Long-Term Large Load Response. PJM analytical framework for planning against very large new loads (typically data centres).

MISO

Midcontinent Independent System Operator. Regional grid operator covering 15 US states and Manitoba.

MV

Medium Voltage. Typically defined as 1 kV to 35 kV. The voltage class connecting data centre power distribution to the utility grid.

MVA

Mega-Volt Amperes. Apparent power rating unit used for transformers and switchgear.

MW

Megawatt. Unit of electrical power. A large modern data centre draws tens to hundreds of MW.

MWh

Megawatt-hour. Unit of electrical energy. One MW delivered for one hour.

OCP

Open Compute Project. Hyperscaler-led standards body developing open reference designs for data centre hardware.

PJM

PJM Interconnection LLC. Regional grid operator covering 13 US states plus DC. Includes Ohio, where the NVIDIA/OpenAI campus sits.

PPA

Power Purchase Agreement. Long-term contract locking in electricity price per MWh over a defined term.

PUE

Power Usage Effectiveness. Data centre efficiency metric. Total facility power divided by IT equipment power. Lower is better.

SMR

Small Modular Reactor. Nuclear reactor design with output typically below 300 MWe, envisioned for co-located generation.

TSO

Transmission System Operator. Term used in Europe for the entity operating the high-voltage transmission grid.

Semiconductor and technical

AI

Artificial Intelligence. Used throughout to reference the demand driver behind the buildout.

DC

Direct Current. Also, ambiguously, "Data Centre". Context usually disambiguates.

GPU

Graphics Processing Unit. The compute silicon at the centre of AI workloads.

HBM

High Bandwidth Memory. Stacked memory technology used adjacent to AI GPUs.

HSC

Hybrid Supercapacitor. Energy storage technology bridging batteries and traditional capacitors.

IVR

Integrated Voltage Regulator. On-package power delivery component for modern CPUs and GPUs.

SiC

Silicon Carbide. Wide-bandgap semiconductor material used in high-voltage power electronics.

GaN

Gallium Nitride. Wide-bandgap semiconductor material used in RF and power applications.

WBG

Wide-Bandgap. Semiconductor material class (SiC and GaN) used in high-efficiency power electronics.

VDC

Volts Direct Current. Used in 48 VDC and 800 VDC references to rack-level and datacentre power distribution.

Load flexibility and flexibility rights

Flexibility right

Contractual operating claim held by a grid operator, utility, ISO, hyperscaler tenant, platform vendor, or site operator, allowing the counterparty to change the customer's electrical operating envelope under defined conditions in exchange for consideration (faster interconnection, lower firm-capacity charges, capacity-market receipts, or other payment). Canonical framing from The Flexibility Right.

Bankable flexibility right

A flexibility right that has cleared accreditation, contract enforcement, and value-sharing arrangements so that it can be underwritten as an investable financial asset. Technical flexibility alone establishes very little bankable investment value.

Kill-shot ratio

NPV of interconnection pull-forward value divided by NPV of curtailment opportunity cost over the contract term. Scale-invariant in cluster MW and $/GPU-hour; moves with queue-delay months, curtailment hours, throttle depth, contract term, and discount rate. See the essay for the 43.8× base case and 2.4× adverse case.

Scarcity-Transfer Principle

Flexibility technologies compete on how much scarce interconnection capacity they can transfer from the grid to the customer, and how much of that transferred value they can retain. The technology's raw electrical flexibility is only the starting point.

BTM

Behind-the-meter. Generation or storage assets located on the customer's side of the utility revenue meter, allowing the customer to serve load without drawing from the grid. Enchanted Rock gas microgrids and Verrus BESS installations are BTM.

OpenADR

Open Automated Demand Response. Utility-industry standard protocol for signalling load-flex events between grid operators and customer control systems. Standardisation risk for software coordination vendors: as OpenADR and hyperscaler control-plane APIs converge, the coordination layer commoditises.

Load flex

Reducing, shifting, or curtailing datacenter load in response to grid conditions. Distinct from supply-side firming (which adds behind-the-meter generation) even though older demand-response literature groups them.

Hall-level BESS + AI datacenter batteries

Hall BESS

Grid-interactive electrical storage deployed at data-hall or campus scale whose economic role extends beyond conventional UPS ride-through. Includes energy management, peak management, grid services, demand response, or other dispatchable flexibility. Functional boundary, not physical. See Hall-level BESS.

Rack BBU

Rack-level battery backup unit. Seconds-to-minutes IT ride-through. Non-dispatchable. Distinct from hall BESS in scale, duration, and grid interaction.

Grid-forming BESS

Battery-energy-storage system with inverters capable of establishing voltage and frequency reference for a microgrid or grid segment. Enables black-start and islanded operation. IEEE 2800 codifies the standard.

Revenue stack (BESS)

Market-clearing revenue streams a battery can access: energy arbitrage, demand-charge reduction, ancillary services, capacity payments, demand response, bilateral flexibility.

Value stack (BESS)

Broader economic value beyond market clearing: resilience, avoided generator capex, interconnection acceleration, financing benefits. Value-stack items accrue internally.

EaaS / VaaS

Energy-as-a-Service / Vendor-as-a-Service. Contract structure where a vendor owns, operates, and captures dispatch revenue from an on-site battery in exchange for a service fee to the site owner. One of four hall-BESS ownership models.

BTM storage

Behind-the-meter storage. Assets located on the customer side of the utility revenue meter. Regulatory participation rules vary by ISO; FERC Order 841 opened wholesale-market access for BTM storage in US ISOs subject to state opt-outs.

How this glossary is maintained

Every new essay in the corpus adds any new acronyms it introduces to this page. Article-level glossaries at the end of individual essays cover the acronyms specific to that piece; this sitewide page covers the full corpus. If a term seems to be missing, it may be because the essay defines it inline on first use rather than using an acronym.