We next address the particular scenario of negative electricity prices. Figure shows that realtime prices can also spike to large negative values. This occurs when active electricity supply is in excess of consumer demand; the grid can only tolerate the excess to a certain extent, at which point operators will lower the price to encourage consumption to balance the grid. Importantly, this means market stakeholders can be paid to consume electricity. While we do not present a case study of this phenomenon, MP systems can also consume the electricity as part of a combined heat and power system (CHP) suggesting that MP systems should buy electricity when prices are negative (use the grid to run the CHP system) and store biogas to sell electricity when prices peak (a practice known as hedging). Negative electricity prices are secondary advantage to being classified as a DER on the real-time market. FERC-2222 allows MP systems to compete on the same level as traditional electricity providers (e.g., power plants); however, MP systems still occupy a small share of the market. MP systems can participate in the markets as a peaking resource, similar to natural gas-fired power plants. A detailed techno-economic analysis is required to determine the amount of electricity a DER could anticipate purchasing at negative prices, and how much could be produced for sale as a peaking service.