A utility cooperative is a type of cooperative that is tasked with the delivery of a public utility such as electricity, water or telecommunications to its members. Profits are either reinvested for infrastructure or distributed to members in the form of "patronage" or "capital credits", which are dividends paid on a member's investment in the cooperative.
Each customer is a member and owner of the business with an equal say as every other member of the cooperative, unlike investor-owned utilities where the amount of say is governed by the number of shares held. Like coops operating in other sectors, many utility cooperatives conduct their affairs according to a set of ideals based on the Rochdale Principles. Some utility cooperatives respect the seventh principle, Concern for community, through Operation Roundup schemes, whereby members can voluntarily have their bill rounded to the next currency unit (e.g. $55.37 becomes $56), with the difference (e.g. 63¢) distributed to a fund for local charities.
Many such cooperatives exist in the rural United States, and were created by the New Deal  to bring electric power and telephone service to rural areas, when the nearest investor-owned utility would not provide service, believing there would be insufficient revenue to justify the capital expenditures required. Many electric cooperatives have banded together to form their own wholesale power cooperatives, often called G&Ts for generation and transmission, to supply their member-owners with electricity.
Many utility cooperatives strive to bring the best service at the lowest possible cost, but often the high cost of maintaining the infrastructure needed to cover large, rural areas without the support of large cities as a rich customer base causes prices to be high. However, a few such co-ops have managed to tap into urban markets (due to growth into previously rural territory served by the co-ops) and have proven to be very cost-effective. More recently established energy co-ops began with national coverage: Co-operative Energy in the UK and Enercoop in France being examples of consumer cooperatives. Other co-ops have formed to concentrate on the generation of renewable energy, especially wind energy co-operatives.
There are two types of electric cooperatives, distribution cooperatives and generation and transmission (G&T) cooperatives. Distribution electric cooperatives serve end-users, such as residences and businesses, who make up their membership. Generation and transmission cooperatives typically sell wholesale power to distribution cooperatives and are cooperative federations owned by their member co-ops.
Most electric cooperatives in the United States carry the name "electric cooperative" in their name, which makes it easy to identify their organization. Most cooperatives carry a name that identifies or explains some aspect of their service area. For example, Bluebonnet Electric Cooperative in Texas is named after the Bluebonnet which grows naturally in its service area and A&N Electric Cooperative in Virginia, is named so because it serves Accomac County and Northampton County. For years after the Rural Electrification Administration was established, many rural residents in the US called cooperatives, regardless of their name, "REA" and would in turn say they were served by REA instead of the cooperative name if asked who their electric provider was. Today, some cooperatives, though, either by choice or by the guidance of state charter laws, carry a variation of the cooperative name. These include:
- Electric Cooperative Association
- Rural Electric Association
- Rural Electric Cooperative
- Rural Electric Cooperative Corporation (RECC)- Mainly used in Kentucky 
- Electric Membership Cooperative (EMC)- Used in many states, such as Indiana, North Carolina, Georgia, Tennessee, Alabama, etc.
- Rural Electric Membership Corporation (REMC)
- Electric Power Association (EPA)- Mainly used in Mississippi
- Power Cooperative
- Energy Cooperative
Several states have another variation of the utility cooperative and which are known as Public Power Districts (PPDs) in Nebraska and Public Utility Districts (PUDs) in Oregon and Washington. In both cases, the laws that created these 'quasi-cooperative' utilities were created with the specific intent of taking over territory being served by privately owned power companies in those states. Nebraska's conversion from a mixture of power companies serving the state to a public power empire spanned the 1940s (the last privately owned utility line into the state being cut on December 29, 1949), with the creation of the PUDs in the Pacific Northwest starting about the same time and continuing with varying degrees of success over the following two decades. The key difference between a PPD/PUD and a cooperative is that PPDs/PUDs are publicly controlled by residents of a state or local area and run more like a municipal power system than a cooperative system. A cooperative is owned and operated by the customers they serve within their designated service area. Cooperative owners have voting rights to elect the cooperative's board members each year and generally have more say in the operations than other utility forms.
Small cooperatives often band together to achieve economies of scale, share expertise and stand together on regulatory issues. There are several state-wide (and in Canada, province-wide) associations of cooperatives, including Kentucky  and Nova Scotia  .
In 2013, REScoop, a European federation of energy co-operatives, both producers' and consumers', was launched. It has 11 members in 7 countries.
Telephone Cooperatives have today expanded beyond their historical role of providing fixed line telephone services, by also offering broadband and often cable TV services (via DSL, coaxial cable or optical fibre), and mobile/wireless services.
There are approximately a dozen telephone cooperatives in Canada, with the majority operating in Ontario, the most populous state. The largest, however, are large regional providers: Access Communications Co-operative in Saskatchewan and Westman Communications Group in Manitoba.
There are approximately 260 telephone cooperatives in the US, together employing approximately 23,000 and annual revenues of $3.9B. Many were formed during the New Deal in the 1930s, but some date to the turn of the 20th century. Most operate one - or a small number of - exchanges, typically as an Incumbent Local Exchange Carrier (ILEC), but some have become regional players through merger and now operate as Competitive Local Exchange Carriers (CLEC).
Cooperatives here have national coverage.
- The telephone network in Finland was largely built by telephone cooperatives, the largest of which, founded in 1882, was the Helsinki Telephone Association (the now demutualised Elisa).
- In the UK, The Phone Co-op was established in 1998 and provides broadband, fixed line and mobile telecoms services to consumers and organisations.
- Mobile virtual network operator mobile telephony services are operated in several countries by retail consumer cooperatives: coop mobil in Denmark, coopmobil in Czech Republic, CoopVoce in Italy; and M-Budget, CoopMobile Abo and CoopMobile Prix Garantie in Switzerland.
- Rural Utilities Service
- Touchstone Energy
- National Rural Electric Cooperative Association
- Vector Limited a 75% utility coop in New Zealand
- Public utility district
- List of utility cooperatives
- Explanation of Patronage or Capital Credits
- Operation Roundup
- Rural Electrification
- "Rural Telephone Cooperatives". Economic Impacts of Cooperatives. University of Wisconsin Center for Cooperatives. Retrieved 7 June 2014.
- National Rural Electric Cooperative Association, the national trade association of electric cooperatives
- Touchstone Energy, a national branding association of U.S. energy utility co-ops.
- History of Coops, a discussion of the history of cooperatives
- Texas Electric Cooperatives, a statewide organization dedicated to representing 65 electric distribution cooperatives and the 9 generation and transmission cooperatives.
- Georgia Electric Membership Corp., a statewide support and trade association for the 42 EMCs in Georgia
- Tennessee Electric Cooperative Association, a statewide support and trade association for 23 electric distribution cooperatives in Tennessee
- Electric Cooperatives of Arkansas, a group of 17 electric cooperatives serving areas of Arkansas
- GEMC GEORGIA Magazine, (formerly RURAL GEORGIA magazine) the official publication of the Electric Membership Cooperatives (EMCs) in Georgia
- Michigan Country Lines Magazine, published by the Michigan Electric Cooperative Association for consumers
- What's a Coop? at the Rural Telephone Service Company site
- Iowa Touchstone Energy Home, standards and guidelines for energy-efficient home construction
- REC InfoCenter, information for REC members, including energy efficiency, online classifieds and recipes
- Corn Belt Power Cooperative, Iowa-based generation and transmission rural electric cooperative whose member distribution cooperatives provide electricity to members in 41 northern Iowa counties
- Choptank Electric Coop, Maryland based transmission rural electric cooperative with members in 9 counties on the Eastern Shore
- Buckeye Power/Ohio Rural Electric Cooperatives, Ohio G&T and statewide association of electric cooperatives
- Pedernales Electric Cooperative, Services over 20 counties in Texas
- Encyclopedia of Oklahoma History and Culture - Electric Cooperatives