Multifamily grid services
CAISO markets, utility DR, FERC 2222, and SGIP stack into real revenue on the flexible load you already control—heat pumps, EV chargers, storage, and solar—without tenants noticing.
CAISO operates several markets where aggregated controllable loads get paid. Utility demand response, wholesale energy and ancillary services, and new DER aggregation rules create paths that did not practically exist for multifamily at scale even a few years ago.
The sections below map the four revenue streams, the assets you already touch, who aggregates today, and realistic revenue math for a representative building.
Stack utility DR, ISO markets, FERC 2222 aggregation, and SGIP-backed storage to unlock revenue that sits on top of the efficiency work you already do.
Stream 1
Utility-administered programs (PG&E, SCE, SDG&E) that pay you to curtail or shift load on request.
Who pays: the utility, not CAISO directly. Often simpler to access.
Stream 2
The direct CAISO market participation path for demand-side resources.
Stream 3
Federal rule (2020) still rolling out at ISOs: requires markets to allow DER aggregations — behind-the-meter storage, solar, and controllable loads — in wholesale markets.
Stream 4
Not a market payment, but directly additive to project economics.
HPWHs are particularly valuable — they behave like a thermal battery. Pre-heat during low prices or high solar, then shed load when the grid is stressed. Comfort stays stable; the market sees the flexibility.
| Asset | Flexible load potential | Response time |
|---|---|---|
| Heat pump water heaters | 1–4 kW/unit, thermal storage buffer | 30 sec – 5 min |
| EV chargers | 6–20 kW/port, highly schedulable | Immediate |
| Battery storage | Bi-directional, highest value | < 1 second |
| Solar inverters (e.g. SolarEdge) | Curtailment / ramp control | Seconds |
| Common-area HVAC | 10–50 kW per building | 5–15 min |
Most portfolios do not go straight to CAISO — you partner with or become a Demand Response Aggregator (DRA) or Curtailment Service Provider (CSP). Examples of active models:
| Company | Model |
|---|---|
| AutoGrid | Software platform; strong utility partnerships |
| Voltus | Pure-play DR aggregator; pays building owners |
| Leap | API-first; smaller DERs; integration-friendly |
| OhmConnect | Residential-led; expanding footprint |
| CPower | Large C&I and multifamily focus |
Strategic question: partner with an aggregator as a channel, or build toward becoming the aggregator for your own portfolio as programs and thresholds evolve?
Illustrative only; tariffs, program rules, and your qualified capacity change outcomes. Use this as an order-of-magnitude conversation starter with your engineering and finance teams.
| Source | Assumption | Annual / amount |
|---|---|---|
| HPWH DR (SDG&E example) | 80 units × 2 kW × ~$10/kW-mo | $19,200 |
| CAISO ancillary (via aggregator) | 160 kW × ~$30/kW-yr capacity | $4,800 |
| SGIP battery incentive (one-time)Upfront incentive, not annual | 50 kWh × ~$600/kWh | $30,000 |
| Ongoing annual grid revenue (illustrative) | — | ~$24,000 / building |
At 10 buildings in a portfolio with similar profiles, that is on the order of ~$240K/year in grid services revenue — on infrastructure you are already specifying for solar, HPWH, and electrification projects.
FERC 2222, CAISO PDR, and utility DR programs combine into a three-layer revenue stack that barely existed for multifamily half a decade ago.
The IoT layer — edge controllers, time-series telemetry (e.g. InfluxDB), and inverter APIs such as SolarEdge — is the control and visibility fabric these markets expect. If you are already instrumenting plants and central plants, you are closer to participation than most contractors assume.
Discuss DR, ISO participation, or instrumentation for grid services on your portfolio