Offtaker

Wiki-Solar

The authority on utility-scale solar power

Maps available for selected companies using pull-down menus above or hyperlinks below

Rank

Power off-taker

Projects number

Capacity MWp

1

NorthWest China Power Grid [CN]

106

2,074

2

Pacific Gas & Electric [US]

28

1,742

3

San Diego Gas & Electric [US]

14

1,327

4

Southern California Edison [US]

29

1,213

5

Eskom [ZA]

20

783

6

Gujarat Urja Vikas Nigam (GUVNL) [IN]

65

693

7

North China Power Grid [CN]

27

429

8

Provincial Electricity Authority (PEA) [TH]

13

367

9

China Southern Power Grid [CN]

6

286

10

NTPC Vidyut Vyapar Nigam (NVVN) [IN]

33

275

11

Ontario Power Authority [CA]

20

258

12

Arizona Public Service [US]

13

220

13

Puerto Rico Electric Power Authority [PR]

5

213

14

Sistema Interconectado Central [CL]

3

201

15

East China Power Grid [CN]

12

181

16

Kyushu Electric Power [JP]

6

175

17

NV Energy [US] (now part of: MidAmerican Energy)

6

154

18

Chubu Electric Power [JP]

3

139

19

Tucson Electric Power [US]

8

137

20

Madhya Pradesh Power Transmission Company [IN]

1

130

21

Progress Energy [US]

8

107

22

Rajasthan Rajya Vidyut Prasaran Nigam (RVPN) [IN]

13

105

Leading off-takers of utility-scale solar power

The most recently published list of leading utility-scale solar plant owners is shown below.

This shows the situation in March 2013, while the earlier position in December 2012 and detailed in this release. The situation has changed substantially since then and a new list will be published soon.

Power Purchase Agreements

The output of utility-scale solar power stations is almost always fed into the grid for sale into the bulk electricity market, though a few (often roof-top) plants supply a local electricity user.

Bulk power is sold under a PPA or power purchase agreement with an electricity utility. We refer to this buyer as the 'power off-taker'.

In open markets the plant owner, who is selling the power, may have a choice of off-taker. In regulated markets there may be only one electricity utility operating in the relevant area.

Utility-owned solar power plant

Some utilities own the power stations, rather than buying the power from an indepent power producer.

A map of utility-owned plants is available here.

Basis of the data used

The data used for the analysis and the table on the left is derived from operating projects of 4MWAC+ on the Wiki-Solar Database, according to these criteria.

Power off-takers are identified against 39% of the operating capacity on the Wiki-Solar Database (of which these top 22 account for 31.2%). The total capacity for power off-takers listed may therefore be on average up to 3 times that identified here (though some do confirm details of their portfolio to Wiki-Solar).

Some off-takers in this list also fulfil other roles in utility-scale projects, and some utilities also own and operate their own plant for example. The figures quoted here apply only to their power purchase activities. Where companies have maps, however, these will show all their projects.

Electricity off-taker

Most utility-scale solar plants feed power into the electricity grid under a Power Purchase Agreement with a utility company

Cotton Centre solar power plant (courtesy McCarthy Building). Arizona Public Service not only takes the power but also owns the plant.