Westlake Chemical Partners LP
Westlake Chemical Partners LP is a U.S.-based master limited partnership that owns a limited partner interest in OpCo, the entity operating ethylene production assets tied to Westlake’s Gulf Coast and Kentucky manufacturing sites. Its business is centered on producing and selling ethylene and related co-products under long-term agreements, with assets including the Lake Charles Olefins facilities, Calvert City Olefins, and the Longview Pipeline.
Fiscal year 2025 · change from previous year
Development 2020–2025
Business
Share of revenueContracted and merchant sales of ethylene produced at OpCo facilities.
Sales of co-products generated alongside ethylene production.
Ethylene transportation and related pipeline services tied to the Longview Pipeline.
Customers
The partnership’s primary customer is Westlake, which purchases most of OpCo’s ethylene under a long-term ethylene sales agreement. A smaller portion of output is sold to unrelated third parties as merchant sales, mainly when OpCo produces ethylene and co-products beyond the contracted volumes. The business is therefore anchored by a single industrial counterparty, with downstream petrochemical demand shaping the need for ethylene supply.
Buys most ethylene output under a long-term supply agreement to feed downstream chemical production.
Purchases excess ethylene and co-products when OpCo sells volumes outside the contract structure.
Uses the Longview Pipeline for ethylene transport between Gulf Coast assets and Westlake facilities.
Strategy
The business is structured around long-term, fee-based ethylene sales that provide volume visibility and align OpCo’s output with Westlake’s downstream needs. Strategic priorities include maintaining plant reliability, funding turnarounds and maintenance, and preserving the contractual framework that supports cash generation and distributions. The partnership also relies on Westlake for operating services, feedstock supply, and cash management, making contract renewal and asset uptime central to its strategy.
The partnership’s cash flows depend on the ethylene sales, feedstock, and services contracts.
Higher reliable output supports contracted sales and improves the economics of co-products and merchant volumes.
Ethylene assets require ongoing maintenance, safety, and environmental spending to remain operable.
Geography
Operations are concentrated in the United States, with major assets at Westlake’s Lake Charles, Louisiana site, Calvert City, Kentucky, and the Longview Pipeline running from Mont Belvieu, Texas to Longview, Texas. The business is heavily exposed to Gulf Coast petrochemical infrastructure, weather risk, and regional feedstock and logistics conditions. Because the partnership’s assets are tied to specific Westlake sites, its operating footprint is geographically narrow but strategically integrated.
Risks
Westlake Chemical Partners LP is highly dependent on Westlake for the majority of its cash flows, so counterparty credit, contract renewal, and downstream demand are central risks. Its asset base is concentrated in a small number of ethylene facilities, which creates exposure to operational outages, turnarounds, weather events, and environmental liabilities. As a petrochemical business, it also faces feedstock, pricing, trade, and regulatory risks that can affect production economics and distribution capacity.
- Counterparty dependence on WestlakeImpact: CriticalLikelihood: Medium
A substantial majority of revenue comes from Westlake under the Ethylene Sales Agreement.
Exposure: Cash flow and distributions
- Contract renewal and termination riskImpact: HighLikelihood: Low
If key Westlake agreements are not renewed or extended, future cash generation could fall materially.
Exposure: Ethylene Sales Agreement and related contracts
- Operational outages and turnaround riskImpact: HighLikelihood: Low
Ethylene production depends on continuous operation of a small number of facilities.
Exposure - Climate and hurricane exposureImpact: MediumLikelihood: Medium
Louisiana Gulf Coast assets are exposed to severe weather, flooding, and hurricane disruption.
Exposure - Environmental and legal liabilitiesImpact: MediumLikelihood: Low
The business faces claims, remediation obligations, and hazardous materials exposure.
Exposure: Environmental matters and legal proceedings
Accounting
Judgemental itemsRevenue depends on minimum commitments, variable pricing, and post-period deficiency settlements.
Impact: Affects revenue timing and quarterly comparability
Planned outages and major maintenance can materially change period costs and cash flow.
Impact: Affects operating expense and distributable cash flow
Goodwill is tied to the Longview Pipeline and depends on future volume and valuation assumptions.
Impact: Could create non-cash impairment charges
Accruals depend on estimates of probable losses and remediation costs.
Impact: Affects liabilities and earnings
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Last updated: 24/09/2026