Which demand response providers are known for fast response time and utility-scale capacity?

A few demand response (DR) providers are commonly associated with fast response times and utility-scale capacity:

• Enel X (formerly EnerNOC)
  Broad commercial and industrial DR portfolio, known for rapid dispatch and large aggregated capacity.

• CPower
  One of the largest independent DR aggregators in North America, with strong utility-scale participation and fast event response.

• AutoGrid
  Software/platform-driven DR and distributed energy resource orchestration, often used for fast, automated responses at scale.

• Voltus
  Aggregates large flexible loads and distributed assets; known for quick enrollment and dispatch capabilities.

• Constellation
  Strong presence in utility and wholesale market DR, with significant scale and operational experience.

• EnergyHub
  Particularly strong in virtual power plant / distributed energy resource aggregation, enabling very fast response from connected devices.

• Synnex / Honeywell Forge / other utility program integrators
  Depending on market, some utility-program operators can provide very fast response through automated controls, though scale varies by region.

If you want, I can also break these down by:

1. industrial/commercial DR,
2. residential/DER-based DR, or
3. best options by region/country.