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Overview

We own the largest hydroelectric portfolio of its kind with more than 100 years of operating experience.

In addition to our unique hydro platform, we own and operate a complementary fleet of high-quality wind assets and other renewable technologies in attractive markets. 

Hydro
Hydropower converts the natural flow of water into electricity when falling water turns the blades of a turbine connected to a generator. Hydro’s advantages as a sustainable, flexible and proven asset class, along with its low operating costs and many environmental advantages, position it as the most attractive and valued renewable technology.

The amount of electricity a hydropower installation can produce depends on the quantity of water passing through a turbine (the volume of water flow) and on the height from which the water falls (the amount of head). The greater the flow and the head, the more electricity produced.

There are different types and sizes of hydropower installations, ranging from micro hydro plants that provide electricity to only a few homes to mega installations.

Some hydropower facilities include dams to increase the head of a waterfall or to control the flow of water and reservoirs to store the water for future energy use (storage dam), while others produce electricity by immediately using a river's water flow (run-of-river).
Wind
One of the fastest-growing renewable power technologies, wind power harnesses the earth’s natural air currents to produce clean electricity.

Wind power can be thought of as a form of solar energy as heat from the sun causes wind to circulate on the Earth's surface. Wind can be harnessed directly to produce electricity when it spins the blades of a wind turbine, which drives an electric power generator.

Advances in aerodynamics and materials have made electricity generation from wind turbines economically cost competitive. Wind power is a renewable resource that produces clean energy - with no emissions and no hazardous wastes.

A wind farm is a cluster of wind turbines that harvest the power of the wind, and is usually connected to the electric grid of a utility for widespread consumption of its electricity. Wind farms are located in areas with reliably favorable wind speeds, and can be comprised of 10 to over 100 turbines.
Pumped Storage
This uniquely versatile and flexible hydro technology allows water to flow in two directions between an upper and lower reservoir. This capability allows pumped storage facilities to store large amounts of potential electrical energy.

They are able to produce electricity at peak times while replenishing themselves during periods of lower pricing and demand. Pumped storage acts as the world’s largest “rechargeable battery” and the most cost-effective way to store large amounts of potential electrical energy. We own and operate a 600 megawatt pumped storage facility in Massachusetts, one of only two of its kind in the region. ​
Biomass
Electricity from biomass is produced when bagasse, a natural byproduct of the sugar cane production process, is used to feed a boiler to produce steam and power.