6. Demand Response: EnerNoc

EnerNoc (NSDQ: ENOC) has built a portfolio of more than 2,000 megawatts under management as of the end of last year – twice the size of its portfolio at the end of 2007 – and has since added another 310 more megawatts in contracts with utilities in Idaho and Maryland. Given that every megawatt that can be curtailed equals a megawatt of new generation capacity utilities don't need to build, that puts EnerNoc in the position of being a bit like a power generator of its own (see In New England, A Demand Response Company Gets Utility-Sized).

But EnerNoc, while a leader in the field, is far from alone in the scope of its business. New York-based CPower has about 2,200 megawatts under management, as does East Hanover, N.J.-based Comverge (NSDQ: COMV). Comverge has distinguished itself in another way – it has made large-scale inroads into residential demand response programs, with about two-fifths of its total megawatts under management coming from homes (see Demand Response: The Home vs. C&I Debate).

An honorable mention also has to go to Foundation Capital. The VC firm invested in EnerNoc, Silver Spring and eMeter, making it the firm with the strongest track record in the field.

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Tags: a123 systems, aes, altair, american electric power, austin energy, building management and networking, comverge, cpower, demand response, duke energy, echelon, emeter, energy storage, enernoc, general electric