19366_Authority_August

54 The Authority │ August Beyond methane, forward-thinking authorities are exploring: • Wastewater heat recovery using water-source heat pumps, which extract thermal energy from effluent streams to heat buildings or support digester operations. • Hydraulic energy capture through in-line turbines at points where gravity-fed flows carry significant pressure. • Carbon credit generation from verified methane capture, valued at approximately $20 per ton of CO2 equivalent. Energy recovery transforms a treatment plant from a pure consumer into a partial producer, fundamentally changing the economics of operations. Strategy 4: Reduce your load profile — it is not just what you use, it is when. Your energy bill is not simply a function of total consumption. It reflects when you use energy, and peak demand charges can represent a significant portion of commercial electricity costs. Municipal water and wastewater operations often create sharp demand spikes during morning pump cycles and evening aeration peaks. What matters is not only how much electricity is used. It is when that electricity is used. Load management strategies for municipal authorities include: • Shifting non-critical pumping to off-peak hours when electricity rates are lower. • Staggering equipment start- up sequences to avoid simultaneous demand spikes. • Installing battery storage or on-site generation to shave peak loads. • Participating in demand response programs to earn revenue or bill credits by reducing consumption during grid stress events — many utilities offer programs specifically suited to municipal water and wastewater facilities with flexible load. • Reviewing rate tariffs with your utility or energy procurement partner to ensure you are on the most advantageous rate structure for your consumption pattern. Five actionable takeaways for energy management professionals: 1. Conduct a facility energy audit. Understand where every kilowatt-hour goes before making procurement decisions. You cannot manage what you do not measure. 2. Prioritize aeration efficiency. It is your largest single energy draw. Automated controls and VFDs deliver fast, measurable returns. 3. Evaluate biogas and heat recovery potential. If you operate anaerobic digesters, you are sitting on a recoverable energy asset. 4. Analyze your load profile and rate tariff. Shifting even a small percentage of demand away from peak hours can meaningfully reduce costs. 5. Treat energy procurement as an ongoing strategy. Lock in commercial natural gas and electricity contracts that balance price certainty with market flexibility and review them regularly. Frequently Asked Questions How do I manage energy volatility and costs at a municipal treatment facility? Start with a comprehensive energy audit to identify your largest cost drivers. Then implement a layered strategy that combines equipment efficiency upgrades, energy recovery from biogas and wastewater heat, load profile management, and a structured energy procurement approach that includes fixed-price or blended commercial natural gas contracts. What percentage of a wastewater plant’s budget goes to energy? Energy costs typically account for 30% to 50% of total operation and maintenance expenses at U.S. wastewater treatment plants. Can a wastewater treatment plant generate its own energy? Yes. Facilities with anaerobic digesters can capture methane-rich biogas and convert it to electricity and heat through combined heat and power systems, offsetting 15% to 25% of external energy demand. What is load profile management, and why does it matter? Load profile management means controlling when you use energy, not just how much. Peak demand charges