What are zettajoules – and what do they tell us about Earth’s energy imbalance?

Earth’s energy imbalance rose by about 11 zettajoules/year between 2005–2025, and ocean heat content hit a record ~23 ZJ last year (more than double the prior two-decade average). WMO lead author John Kennedy equates the 2025 ocean imbalance to ~39x annual human energy use; analogous comparisons include ~11 Hiroshima bombs of energy per second and enough heat to vaporize ~3.4bn Olympic pools. This indicates accelerating systemic climate risk with material long-term implications for insurers, infrastructure, agriculture and energy transition planning, though near-term market-moving effects are limited.

Analysis

The immediate economic knock-on from accelerating planetary heat uptake is not just larger storms but a systematic re-pricing of physical resilience across supply chains and capital allocation. Expect persistent increases in downtime at coastal ports, refrigerated logistics, and near-shore fisheries, which will amplify input-cost volatility for food, chemicals and semiconductor supply chains over the next 3–7 years. Financial markets will internalize this through higher cost of capital for assets exposed to recurrent physical risk and lower valuations for long-duration, asset-heavy businesses in exposed geographies.

Energy systems will be stressed asymmetrically: peak cooling demand compresses headroom on grids during heatwaves, raising value for fast-start firming capacity and grid-scale storage even as baseload generation becomes politically sensitive. This creates a widening spread between capacity/assets that can arbitrage hourly peaks (gas peakers, short-duration batteries) and intermittent renewables without firming, a gap that will be visible in power margins and capacity auctions within 1–3 years. Carbon policy tail risks (higher prices, border adjustments, attribution-driven litigation) materially shorten the economic life of fossil-heavy investments and accelerate capex into resilient electrification.

The insurance and sovereign-credit channels are the multiplier: rising frequency of high-loss events will push reinsurance capital costs higher, widen cat-bond spreads, and transfer more fiscal burden to municipal and small-island sovereigns — a continent-to-portfolio transmission of climate risk. Catalysts to watch are above-average storm seasons, high-prevalence attribution studies tying single events to emissions (which accelerate litigation), and incremental regulatory moves (mandatory disclosures, building-code retrofits) that force rapid write-downs. These dynamics favor regulated, inflation-linked infrastructure and operating models that monetize resilience, while compressing shallow-margin, asset-heavy coastal real estate and unconstrained insurers.

Key Decisions for Investors

• Long Cheniere Energy (LNG) — 12–24 month view. Position: buy shares or buy-to-open call spread (LNG Jan 2028 70/95). Rationale: near-term premium on flexible LNG exports and utility gas-fired peakers during hotter summers. Risk: slower global gas demand or faster-than-expected renewable firming; target 25–40% upside, capped loss at option premium.
• Long NextEra Energy (NEE) — 24–36 month view. Position: accumulate on any 5–10% pullback. Rationale: benefits from accelerated grid resilience and contracted renewable + storage pipelines; regulatory rate-base growth and dividend cushion reduce downside. Risk/reward: downside c.15% in adverse rate cycles, upside 20–35% as projects come online and multiple re-rates.
• Short reinsurers: pair short RenaissanceRe (RNR) and/or Everest Re (RE) — tactical 6–12 months. Position: small-size short or buy puts into hurricane season. Rationale: underwriting loss frequency is a leading indicator; above-trend catastrophe seasons can compress EPS quickly and reprice capital costs. Risk: single-season volatility; set stop if implied cat-bond spreads compress by >50 bps. Reward: asymmetric if a major season triggers >20% move lower in shares.
• Long water utilities & resiliency plays: American Water Works (AWK) and Veolia (VEOEY OTC) — 3–5 years. Position: core holdings or buy calls on AWK (18–36 month). Rationale: structural capex need for drought/desalination and municipal resilience funds, steady regulated cashflows with pricing power. Risk/reward: low-beta with dividend support; modest 15–30% total-return upside as capex and rate cases materialize.