Development Accounts Payable Specialist

About Middle River Power

Middle River Power (MRP) is a private equity-sponsored platform specializing in the investment and asset management of U.S. power generation facilities. With over 8GW of natural gas, coal, battery storage, and solar facilities across multiple states, the company focuses on safe, reliable, and efficient power plant operations. MRP’s executive team collectively brings over 120 years of expertise in energy management and power generation, collaborating closely with plant personnel and industry professionals.

MRP applies a data-driven approach to investment and operational decisions, considering key factors such as regulatory changes and resource planning. Learn more at

Our business thrives on a set of behaviors that allow our team-based culture to reach high standards and build on one another’s strengths. MRP is a PE-backed environment that requires operating at pace, calculated risk-taking, and creative problem-solving. The people we hire must excel not only in their technical domain but also embody the behaviors that make us successful.

• Love What You Do - Genuine curiosity for the energy sector and our business
• Collaborate to Win - Works across teams; believes partnership delivers results
• Comfort with Ambiguity - Adapts to growth and change; solves problems resourcefully
• Innovation Over Status Quo - Brings fresh thinking and challenges assumptions
• Confident & Honest - Owns their contribution; transparent about what they don't know
• Progressive Problem Solver - Guides problems to solutions; works hard to get it done
• Here for the Long Term - Committed to building a career and business with others

The Development Accounts Payable Specialist is responsible for ensuring the accurate and timely processing of vendor invoices, payment transactions, and financial records supporting plant operations and development projects. This role serves as a key liaison between vendors, contractors, operations, and accounting teams to maintain strong financial controls, support project cost tracking, and ensure compliance with company policies and contractual obligations.

The Development Accounts Payable Specialist reports to the Director of Accounting and is based in Spokane, Washington.

• Manage the full‑cycle accounts payable process, ensuring accurate and timely vendor payments while maintaining compliance with company policies and internal controls.
• Review, code, and process vendor invoices using appropriate general ledger accounts, cost centers, and project allocations.
• Match invoices to purchase orders, receiving documentation, and contract terms to ensure accuracy and proper authorization.
• Apply appropriate sales and use tax treatment and ensure compliance with applicable tax requirements.
• Enter invoices into the accounting system, route for approval, and proactively follow up on outstanding approvals to meet payment deadlines.
• Serve as the primary point of contact for vendor inquiries, resolving payment discrepancies and maintaining positive vendor relationships.
• Maintain accurate vendor records, including W‑9s, insurance certificates, contracts, and supporting documentation.
• Support accounting activities related to plant development, construction, expansion, and capital improvement projects, including project cost tracking and reporting.
• Assist with monthly close activities, including preparation of accounts payable accruals and supporting schedules.
• Analyze and prepare reports related to operating and maintenance (O&M) expenses, identifying budget-to-actual variances and cost trends.
• Support budgeting, forecasting, and financial reporting processes by providing accurate accounts payable and project expenditure data.
• Assist with annual audits by preparing requested documentation and responding to auditor inquiries.
• Coordinate year‑end 1099 reporting and other regulatory reporting requirements related to accounts payable.
• Continuously identify opportunities to improve accounts payable processes, documentation, and internal controls.
• Perform other accounting, administrative, and special project responsibilities as assigned.

• Associate…